OBD-II Network Communication Diagnostic Codes (U0001-U0050)
In general the wiring harnesses itself will never get a short or have a open within the harness unless its been in a fire or had mechanical damage
done to the harness. Sometimes the harness may experience wire fatigue breakage when the harness is subjected to being constantly flexed back and forth.
The harness connectors sometimes fail due to mechanical damage or they become faulty because of corrosion and rust within the connector itself
causing the contact pins to no longer carry a signal to the other modules.
So start by first inspecting the wiring harness and connectors for obvious damage or the connector just
being loose. If the connectors and the harness passes the inspection then maybe you have a faulty computer module.
But before even doing that make sure the battery and the charging system are good and supplying the proper voltages to the various modules.
OBD-II Code U0001
High Speed CAN Communication Bus
U0001 is a OBD-II trouble code (DTC) that indicates a problem with your vehicle's High-Speed Controller Area Network (CAN) bus. The CAN bus is
essentially a communication network that allows various electronic control modules (ECMs) in your car to talk to each other. This code means the
Powertrain Control Module (PCM) detected an error in the CAN bus system, specifically the high-speed portion. This can hinder communication between
various modules affecting your vehicle's performance.
Some of the possible symptoms for a OBD-II Code of U0001:
Illuminated Check Engine Light
Difficulty starting the vehicle
Engine Stalling
Performance issues like reduced power or erratic transmission behavior
Malfunctioning gauges or warning lights (depending on which modules are affected)
Some possible causes for a OBD-II code of U0001:
CAN Bus Circuit Issues - Wiring problems, loose connections, or corrosion within the CAN bus circuit can trigger this code.
Faulty Battery or Corroded Terminals - A weak battery or corroded battery terminals can affect electrical communication throughout
the car, including the CAN bus.
Malfunctioning Control Module - A damaged or malfunctioning control module connected to the CAN bus could be causing the disruption.
Troubleshooting OBD-II Code U0001
Check for diagnostic trouble codes (DTCs): There might be additional codes that provide more clues about the problem.
Inspect wiring: Look for visible damage to the CAN bus wiring harness.
Check connectors: Ensure all connectors are securely connected and free of corrosion.
Clear the code: After making repairs, clear the code and see if it returns.
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OBD-II Code U0002
High Speed CAN Communication Bus
The OBD-II trouble code (DTC) U0002 refers to a malfunction in your vehicle's High-Speed Controller Area Network (CAN) bus performance. The CAN
bus acts as a communication network for various electronic control modules (ECMs) in your car. A code of U0002 indicates the Powertrain Control
Module (PCM) detected a performance issue with the high-speed section of the CAN bus. This can disrupt communication between different modules,
potentially affecting your vehicle's operation.
Some of the possible symptoms for a OBD-II Code of U0002:
Illuminated Check Engine Light
Secondary codes - Often accompanied by other codes specifying which module isn't communicating.
Engine performance issues like reduced power or stalling
Transmission problems
Malfunctioning gauges or warning lights (depending on affected modules)
Difficulty starting the vehicle (in some cases)
Some of the possible causes for a OBD-II code of U0002:
CAN Bus Malfunction - Faulty wiring, loose connections, or corrosion within the CAN bus circuit can cause this code.
Electrical Issues - A weak battery, corroded battery terminals, or other electrical problems can interfere with CAN bus communication.
Software Glitch - In some cases, a software glitch in one of the connected modules might be responsible.
Defective Module - A malfunctioning control module connected to the CAN bus could be the culprit.
Gateway module failure - The module responsible for translating messages between different CAN bus systems might be at fault.
Troubleshooting OBD-II Code U0002
Check for diagnostic trouble codes (DTCs): There might be additional codes that provide more clues about the problem.
Inspect wiring: Look for visible damage to the CAN bus wiring harness.
Check connectors: Ensure all connectors are securely connected and free of corrosion.
Clear the code: After making repairs, clear the code and see if it returns.
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OBD-II Code U0003
High Speed CAN Communication Bus (+) Open
U0003 is a OBD-II trouble code (DTC) for your vehicle's High-Speed Controller Area Network (CAN) bus. The CAN bus is a communication network
that allows various electronic control modules (ECMs) in your car to talk to each other. Since U0003 is an older code, it's less likely to be used
in current vehicles. However, if you're looking into a vehicle issue that might be related to a CAN bus malfunction.
A OBD2 trouble code of U0003 indicates that the Powertrain Control Module (PCM) detected an issue with the high-speed portion of the CAN bus,
hindering communication and potentially affecting vehicle performance.
Some of the possible symptoms for a OBD-II Code of U0003:
Illuminated Check Engine Light
Difficulty starting the vehicle
Engine Stalling
Performance issues like reduced power or erratic transmission behavior
Malfunctioning gauges or warning lights (depending on which modules are affected)
Some of the possible causes for a OBD-II code of U0003:
CAN Bus Faults - Wiring problems, loose connections, or corrosion within the CAN bus circuit could trigger this code.
Electrical Issues - A weak battery, corroded battery terminals, or other electrical problems might disrupt communication.
Troubleshooting OBD-II Code U0003
Check for diagnostic trouble codes (DTCs): There might be additional codes that provide more clues about the problem.
Inspect wiring: Look for visible damage to the CAN bus wiring harness.
Check connectors: Ensure all connectors are securely connected and free of corrosion.
Clear the code: After making repairs, clear the code and see if it returns.
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OBD-II Code U0004
High Speed CAN Communication Bus (+) Low
A trouble code U0004 on an OB2 network indicates a "CAN communication failure" on the vehicle's onboard computer. This
can be caused by a variety of issues, including faulty wiring, connectors, or modules, as well as problems with the
CAN bus itself. To diagnose this code, it's recommended to use a scan tool to read the freeze frame data and look
for any other related trouble codes. Additionally, visually inspect the wiring and connectors for signs of damage
or corrosion, and perform a basic system test to isolate the problem.
OBD-II Code U0004 indicates a problem with the High Speed CAN Communication Bus. Specifically, it means that the positive (+) side of the bus is
registering a low signal. The CAN (Controller Area Network) bus is a critical communication system within your vehicle. It allows different
electronic control units (ECUs) to communicate with each other. When this communication is disrupted it can lead to a variety of issues.
Some of the possible symptoms for a OBD-II Code of U0004:
Engine performance problems
Transmission issues
Anti-lock brake system (ABS) malfunctions
Airbag system malfunctions
Some possible causes for a OBD-II code of U0004:
Damaged or corroded wiring: Look for breaks, shorts, or corrosion in the CAN bus wiring harness.
Faulty ECU: One or more ECUs may be malfunctioning and causing communication problems.
CAN bus transceiver issues: The devices that convert signals between the CAN bus and the ECUs might be faulty.
Other electrical problems: Issues with the vehicle's electrical system can also affect the CAN bus.
Troubleshooting OBD-II Code U0004
Check for diagnostic trouble codes (DTCs): There might be additional codes that provide more clues about the problem.
Inspect wiring: Look for visible damage to the CAN bus wiring harness.
Check connectors: Ensure all connectors are securely connected and free of corrosion.
Clear the code: After making repairs, clear the code and see if it returns.
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OBD-II Code U0005
High Speed CAN Communication Bus (+) High
A trouble code U0005 on an OB2 network indicates a "CAN bus error" or "CAN bus timeout". This code usually occurs when
the onboard computer is unable to communicate with one or more of the modules on the CAN bus within a specified time
period. This can be caused by a variety of issues, including faulty wiring, connectors, or modules, as well as problems
with the CAN bus itself. To diagnose this code, it's recommended to use a scan tool to read the freeze frame data and look
for any other related trouble codes, and perform a basic system test to isolate the problem.
OBD-II Code U0005 indicates a problem with the High Speed Controller Area Network (CAN) bus. Specifically, it means that the CAN High bus (+) line has a
high signal. This means there's an issue with the electrical communication between various vehicle control modules.
Some of the possible symptoms for a OBD-II Code of U0005:
Check Engine Light (CEL) illuminated
Multiple other OBD-II codes
Intermittent or complete loss of vehicle functions
Poor vehicle performance
Some possible causes for a OBD-II code of U0005:
Open or shorted wiring - Issues with the CAN High bus wiring can cause this code.
Faulty control module - One or more control modules might be malfunctioning, interfering with CAN communication.
Power supply issues - Problems with the vehicle's electrical system can affect CAN bus operation.
Connectors - Corroded or loose connectors in the CAN bus system can disrupt communication.
Troubleshooting OBD-II Code U0005
Check for other codes - Look for additional OBD-II codes to identify potential related issues.
Inspect wiring - Examine the CAN High bus wiring for any visible damage, breaks or shorts.
Check connectors - Inspect all connectors related to the CAN bus for corrosion or loose connections.
Verify power supply - Ensure the vehicle's electrical system is functioning correctly.
Perform module tests - Test individual control modules for proper operation.
CAN bus communication test - Use diagnostic equipment to check CAN bus communication.
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OBD-II Code U0006
High Speed CAN Communication Bus (-) Open
A trouble code U0006 on an OB2 network indicates a "CAN bus communication failure" or "CAN bus communication lost". This code
is similar to U0005, but it indicates that the onboard computer has lost communication with one or more modules on the CAN
bus. This can be caused by a variety of issues, including faulty wiring, connectors, or modules, as well as problems with
the CAN bus itself. To diagnose this code, it's recommended to use a scan tool to read the freeze frame data and look for
any other related trouble codes, and perform a basic system test to isolate the problem.
OBD-II Code U0006 indicates a problem with the High Speed Controller Area Network (CAN) bus. Specifically, it means that the CAN High bus (-) line has an open
circuit. This is a critical issue as it prevents communication between various vehicle control modules.
Some possible causes for a OBD-II code of U0006:
Open or shorted wiring - Issues with the CAN High bus (-) wiring can cause this code.
Faulty control module - A malfunctioning control module can disrupt CAN communication.
Power supply issues - Problems with the vehicle's electrical system can affect CAN bus operation.
Connectors - Corroded or loose connectors in the CAN bus system can interrupt communication.
Some of the possible symptoms for a OBD-II Code of U0006:
Check Engine Light (CEL) illuminated
Multiple other OBD-II codes
Intermittent or complete loss of vehicle functions
Poor vehicle performance
Troubleshooting OBD-II Code U0006
Check battery and charging system - Ensure the battery voltage is within the specified range and the charging system is functioning correctly.
Inspect CAN bus wiring - Thoroughly examine the CAN bus harness, paying close attention to the negative signal line, for any signs of damage, corrosion,
or loose connections.
Check for water intrusion - Look for signs of water damage in the wiring harness or around the modules, as moisture can cause corrosion and
electrical issues.
Check for water intrusion - Look for signs of water damage in the wiring harness or around the modules, as moisture can cause corrosion
and electrical issues.
Check module grounds - Verify that all modules connected to the CAN bus have proper ground connections.
Scan for additional codes - Use an OBD-II scanner to check for other codes that may help pinpoint the problematic module or area.
OBD-II Code U0007
High Speed CAN Communication Bus (-) Low
The OBD-II code U0007 indicates a problem with the High Speed CAN (Controller Area Network) Communication Bus,specifically that the negative (-) signal
line has a low voltage. This bus is essential for the communication between various electronic control units (ECUs) in your vehicle.
Some of the possible symptoms for a OBD-II Code of U0007:
Illuminated Check Engine Light
Multiple warning lights - Depending on the affected modules, you may see other warning lights related to ABS, transmission, etc.
Performance problems - Erratic shifting, engine misfires, or other driveability issues can occur.
Vehicle may not start - In severe cases, the vehicle may not start at all due to communication failure.
Some of the possible causes for a OBD-II code of U0007:
Wiring issues - Damaged, corroded, or loose wires in the CAN bus harness, especially on the negative side.
Module failure - A faulty control module (e.g., engine control module, transmission control module) can disrupt communication on the bus.
Ground problems - Poor grounding can interfere with the CAN bus signals, causing voltage fluctuations.
Troubleshooting OBD-II Code U0007
Check battery and charging system - Ensure the battery voltage is within the specified range and the charging system is functioning correctly.
Inspect CAN bus wiring - Thoroughly examine the CAN bus harness, paying close attention to the negative signal line, for any signs of damage, corrosion,
or loose connections.
Check for water intrusion - Look for signs of water damage in the wiring harness or around the modules, as moisture can cause corrosion and
electrical issues.
Check for water intrusion - Look for signs of water damage in the wiring harness or around the modules, as moisture can cause corrosion
and electrical issues.
Check module grounds - Verify that all modules connected to the CAN bus have proper ground connections.
Scan for additional codes - Use an OBD-II scanner to check for other codes that may help pinpoint the problematic module or area.
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OBD-II Code U0008
High Speed CAN Communication Bus (-) High
A trouble code U0008 on an OB2 network indicates a "No communication with Engine Control Module (ECM)" issue. This can be
caused by a faulty or disconnected battery, corrosion on the battery terminals, a faulty ECM or other modules, or a problem
with the communication wiring or connectors. The code may also be triggered if the ECM is not receiving the correct voltage
or is malfunctioning. To diagnose this code, it's recommended to check the battery voltage and connections, inspect the wiring
and connectors for signs of damage or corrosion, and perform a basic system test to isolate the problem.
The OBD-II Code U0008 indicates a problem with the High Speed Controller Area Network (CAN) bus communication system in your vehicle. Specifically, it means there's a high
signal or voltage on the CAN High line. Modern vehicles have numerous electronic control units (ECUs) that communicate with each other through the CAN bus. This system
is crucial for coordinating various functions like engine management, transmission, anti-lock brakes, airbags, and more.
Some of the possible symptoms for a OBD-II Code of U0008:
Illuminated Check Engine Light
Multiple warning lights - Depending on the affected modules, you may see other warning lights related to ABS, transmission, etc.
Performance problems - Erratic shifting, engine misfires, or other driveability issues can occur.
Vehicle may not start - In severe cases, the vehicle may not start at all due to communication failure.
Some of the possible causes for a OBD-II code of U0008:
Wiring issues - Damaged, corroded, or loose wires in the CAN bus harness, especially on the negative side.
Module failure - A faulty control module (e.g., engine control module, transmission control module) can disrupt communication on the bus.
Ground problems - Poor grounding can interfere with the CAN bus signals, causing voltage fluctuations.
Connector Problems: Corrosion or loose connections in the CAN bus connectors can disrupt communication.
Troubleshooting OBD-II Code U0008
Check battery and charging system - Ensure the battery voltage is within the specified range and the charging system is functioning correctly.
Inspect CAN bus wiring - Thoroughly examine the CAN bus harness, paying close attention to the negative signal line, for any signs of damage, corrosion,
or loose connections.
Check for water intrusion - Look for signs of water damage in the wiring harness or around the modules, as moisture can cause corrosion and
electrical issues.
Check for water intrusion - Look for signs of water damage in the wiring harness or around the modules, as moisture can cause corrosion
and electrical issues.
Check module grounds - Verify that all modules connected to the CAN bus have proper ground connections.
Scan for additional codes - Use an OBD-II scanner to check for other codes that may help pinpoint the problematic module or area.
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OBD-II Code U0009
High Speed CAN Communication Bus (-) shorted to Bus (+)
A trouble code U0009 on an OB2 network indicates a "Communication Bus Fault" or "CAN Bus Fault". This code typically indicates
a problem with the communication bus that connects the Engine Control Module (ECM) to other modules on the vehicle, such as
the Transmission Control Module (TCM), Anti-lock Brake System (ABS) module, or Body Control Module (BCM). The code may be
caused by a faulty or damaged CAN bus wiring, a faulty module, or a problem with the CAN bus transceiver. To diagnose this
code, it's recommended to use a scan tool to read the freeze frame data and look for any other related trouble codes, and then
perform a basic system test to isolate the problem.
The OBD-II code U0009 points towards a fault with the High-Speed CAN Communication Bus. This bus is a crucial part of your vehicle's network, facilitating high-speed data transfer between different
control modules.
Some of the possible symptoms for a OBD-II Code of U0009:
Check Engine Light - The check engine light will likely illuminate when this code is stored.
Multiple Warning Lights - You might notice other warning lights related to ABS, traction control, stability control, etc., turning on due to the communication breakdown.
Drivability Problems - Issues like rough idling, stalling, misfires, or poor acceleration could occur.
Transmission Problems - The transmission might exhibit shifting problems or go into limp mode.
Electrical Problems - Malfunctions in various electrical systems like power windows, radio, and air conditioning could be observed.
Some of the possible causes for a OBD-II code of U0009:
Wiring Issues - Damaged, corroded, or loose wiring within the CAN bus circuit can disrupt communication and lead to this error code.
Faulty Modules - A malfunctioning module connected to the CAN bus, such as the engine control module (ECM), transmission control module (TCM), or body control module (BCM), can also trigger
this code.
Ground Problems - Inadequate grounding of the CAN bus can result in electrical interference and communication errors.
Bus Shorted - The high-speed CAN bus may have shorted to either power or ground.
Troubleshooting OBD-II Code U0008
Scan for Codes - Use an OBD-II scanner to read all stored codes and identify any codes related to the U0009 code.
Check Technical Service Bulletins (TSBs) - Consult TSBs from the vehicle manufacturer to see if there are any known issues or fixes for this code.
Inspect Wiring and Connectors - Thoroughly examine the wiring and connectors associated with the CAN bus for damage, corrosion, or looseness.
Check Module Communication - Utilize a professional scan tool to test the communication between modules connected to the CAN bus.
Test for Grounding Issues - Ensure the CAN bus has proper grounding.
Address Shorts - If the bus is shorted, identify and repair the cause of the short circuit.
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OBD-II Code U0010
Medium Speed CAN Communication Bus
OBD-II Code U0010 is a generic OBD-II code that indicates a "Lost Communication with ECM/Engine Control Module" issue. This code
is typically thrown when the engine control module (ECM) is unable to communicate with other modules or systems in the vehicle, such
as the transmission control module, anti-lock braking system (ABS), or traction control system. The code may be caused by a variety
of issues, including faulty wiring, connectors, or modules, as well as problems with the vehicle's electrical system.
The OBD-II code U0010 indicates a fault with the Medium Speed CAN Communication Bus. This bus is a critical network within your vehicle that allows various control modules to communicate
with each other. A malfunction here can lead to a variety of problems.
Some of the possible symptoms for a OBD-II Code of U00010:
Check Engine Light - The check engine light will likely illuminate when this code is stored.
Multiple warning lights - Other warning lights, such as the ABS, traction control, or stability control lights, may also turn on due to communication issues.
Drivability problems - You might experience issues like rough idling, stalling, misfires, or poor acceleration.
Transmission problems - Transmission shifting issues or limp mode may occur.
Electrical problems - Various electrical systems, such as the power windows, radio, or air conditioning, may malfunction.
Some of the possible causes for a OBD-II code of U00010:
Wiring issues - Damaged, corroded, or loose wiring within the CAN bus circuit can disrupt communication.
Faulty modules - A malfunctioning module connected to the CAN bus, such as the engine control module (ECM), transmission control module (TCM), or body control module (BCM), can
cause communication errors.
Ground problems - Poor grounding of the CAN bus can lead to electrical interference and communication problems.
Software issues - In rare cases, software glitches within modules connected to the CAN bus can cause communication errors.
Troubleshooting OBD-II Code U0010
Scan for codes - Use an OBD-II scanner to read all stored codes and identify any related codes.
Check for TSBs - Consult technical service bulletins (TSBs) from the vehicle manufacturer to see if there are any known issues or fixes related to this code.
Inspect wiring and connectors - Thoroughly check the wiring and connectors associated with the CAN bus for damage, corrosion, or looseness.
Check module communication - Use a professional scan tool to test communication between modules connected to the CAN bus.
Test for grounding issues - Verify that the CAN bus is properly grounded.
Update or reprogram modules - If necessary, update or reprogram module software with the help of a qualified technician.
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OBD-II Code U0011
Medium Speed CAN Communication Bus Performance
The OBD-II code U0011 indicates a problem with the Medium Speed CAN Communication Bus Performance. This bus is a critical part of your vehicle's network, responsible for transmitting data between
various modules and systems.
Some of the possible symptoms for a OBD-II Code of U00011:
Check Engine Light - The check engine light will likely illuminate when this code is stored.
Multiple warning lights - Other warning lights, such as the ABS, traction control, or stability control lights, may also turn on due to communication issues.
Drivability problems - You might experience issues like rough idling, stalling, misfires, or poor acceleration.
Transmission problems - Transmission shifting issues or limp mode may occur.
Electrical problems - Various electrical systems, such as the power windows, radio, or air conditioning, may malfunction.
Some of the possible causes for a OBD-II code of U00011:
Wiring issues - Damaged, corroded, or loose wiring within the CAN bus circuit can disrupt communication.
Faulty modules - A malfunctioning module connected to the CAN bus, such as the engine control module (ECM) or transmission control module (TCM), can cause communication errors.
Ground problems - Poor grounding of the CAN bus can lead to electrical interference and communication problems.
Software issues - In rare cases, software glitches within modules connected to the CAN bus can cause communication errors.
Troubleshooting OBD-II Code U00011
Scan for codes - Use an OBD-II scanner to read all stored codes and identify any related codes.
Check for TSBs - Consult technical service bulletins (TSBs) from the vehicle manufacturer to see if there are any known issues or fixes related to this code.
Inspect wiring and connectors - Thoroughly check the wiring and connectors associated with the CAN bus for damage, corrosion, or looseness.
Check module communication - Use a professional scan tool to test communication between modules connected to the CAN bus.
Test for grounding issues - Verify that the CAN bus is properly grounded.
Update or reprogram modules - If necessary, update or reprogram module software with the help of a qualified technician.
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OBD-II Code U0012
Medium Speed CAN Communication Bus (+) Open
OBD-II Code U0012 indicates a "High Speed Can Communication Bus" issue, specifically signifying that there's a
problem with the communication between modules on the Controller Area Network (CAN). This could be caused by
a faulty module, damaged wiring, or poor connections in the CAN bus. It's essential to diagnose the root cause
with appropriate tools, as it can affect various vehicle functions, including engine management and safety
features. To resolve the issue, a technician would typically check the integrity of the wiring, inspect
connectors, and possibly test or replace the affected modules.
The OBD-II code U0012 stands for "Medium Speed CAN Communication Bus (+) Open.
This indicates a problem with the communication network within your vehicle. Your vehicle has a complex network
of sensors and computers that communicate with each other. This network is divided into several buses, including
a medium-speed Controller Area Network (CAN) bus. The (+) refers to the positive wire of this bus. An "open" signal
means there is a break in the circuit, preventing proper communication.
Some of the possible symptoms for a OBD-II Code of U0012:
Check Engine Light - The U0012 code will trigger the Check Engine Light to illuminate on your dashboard.
Drivability problems - Depending on the affected module, you may experience issues with engine performance,
transmission shifting, or other vehicle functions.
Diagnostic difficulties - The U0012 code can interfere with the ability to diagnose other problems with
your vehicle.
Some of the possible causes for a OBD-II code of U0002:
Wiring issues - Damaged, corroded, or loose wires within the CAN bus circuit.
Faulty modules - A malfunctioning control module (such as the engine control module or transmission control
module) can disrupt communication on the bus.
Connector problems - Damaged or corroded connectors can interrupt the flow of signals.
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OBD-II Code U0013
Medium Speed CAN Communication Bus (+) Low
OBD-II code U0013 indicates a communication problem within the Controller Area Network (CAN) bus, specifically
that the module's "High Speed CAN" is experiencing a failure. This can be caused by issues such as damaged
wiring, poor connections, or malfunctioning modules on the vehicle's network. Diagnosis typically involves
inspecting the wiring and connectors for damage, checking the functionality of modules, and using a scan
tool to monitor the CAN bus communication.
The OBD-II code U0013 stands for "Medium Speed CAN Communication Bus (+) Low.
A code of U0013 indicates a problem with the negative wire of the medium-speed Controller Area Network (CAN) bus.
This code signifies a disruption in the communication network within your vehicle. The medium-speed CAN bus is
responsible for transmitting vital information between various control modules.
Some of the possible symptoms for a OBD-II Code of U0013:
Check Engine Light - The U0013 code will trigger the Check Engine Light on your dashboard.
Drivability problems - Depending on which module is affected, you may experience issues with engine performance,
transmission shifting, or other vehicle functions.
Diagnostic difficulties - The U0013 code can interfere with the ability to diagnose other problems with
your vehicle.
Multiple warning lights - Other warning lights may also turn on, as the communication issue can affect
various systems
Some of the possible causes for a OBD-II code of U0013:
Wiring issues - Damaged, corroded, or loose wires in the CAN bus circuit.
Faulty modules - A malfunctioning control module can disrupt communication on the bus.
Connector problems - Damaged or corroded connectors can interrupt the flow of signals in the wire.
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OBD-II Code U0014
Medium Speed CAN Communication Bus (+) High
OBD-II code of U0014 indicates a communication problem within the CAN (Controller Area Network) bus related to the
powertrain control module (PCM). It signifies that there is a fault in the communication network between the PCM
and other modules. This can be caused by issues such as wiring problems, poor connections, or a malfunctioning
module. To diagnose and fix the issue, technicians typically check the wiring and connectors, perform a thorough
inspection of the network for faults, and may use diagnostic tools to evaluate module functionality.
The OBD-II code U0014 stands for "Medium Speed CAN Communication Bus (+) High". This code indicates a
problem with the communication network within your vehicle. The CAN bus is a system that allows various modules
(like the engine control module, transmission control module, etc.) to communicate with each other. A U0014 code
suggests there's an issue with the signal on this network.
Some of the possible causes and solutions for a OBD-II code of U0014:
Wiring problems - Damaged or corroded wires or connectors within the CAN bus circuit.
Module failure - A faulty control module that is sending incorrect signals or not communicating at all.
Ground issues - A bad ground connection affecting the CAN bus circuit.
Software glitch - A temporary problem with the software that controls the CAN bus communication.
Check the wiring - Inspect the wiring harness and connectors related to the CAN bus for any visible damage,
corrosion, or loose connections.
Scan for other codes - Use an OBD-II scanner to see if there are any other codes present.
Sometimes a U0014 code is triggered by a problem in a different module.
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OBD-II Code U0015
Medium Speed CAN Communication Bus (-) Open
OBD-II Code U0015 indicates a problem with the communication line between the Hybrid Powertrain Control Module (HPCM)
and the Powertrain Control Module (PCM). This code suggests a malfunction in the Controller Area Network (CAN), which
can result from issues like faulty wiring, poor connections, or a failure in one of the control modules. Symptoms may
include warning lights, drivability issues, or inconsistent performance. Diagnosing U0015 generally involves checking
for damaged wiring or connectors and ensuring both modules are functioning properly.
The OBD-II code U0015 indicates a communication problem between your car's main computer (PCM) and the Anti-lock Braking System
(ABS) control module and they are not exchanging information properly.
Some of the possible symptoms for a OBD-II Code of U0015:
Illuminated ABS warning light - The ABS light on your dashboard will likely turn on.
Traction control or stability control issues - You may experience problems with these systems if they are linked to the ABS.
Other warning lights - Additional warning lights related to braking or stability may also be illuminated.
Some of the possible causes for a OBD-II code of U0015:
Faulty wiring or connections - This is the most common cause. The wires connecting the PCM and ABS module could be damaged,
corroded, or have loose connections.
Malfunctioning ABS module - The ABS module itself could be defective and unable to communicate correctly.
Faulty PCM: In rare cases - The PCM (the car's main computer) might be at fault.
Troubleshooting OBD-II Code U0015
Visually inspect the wiring and connections - Check the wiring harness and connectors between the PCM and ABS module for any signs of
damage, corrosion, or loose connections.
Scan for additional codes - Use an OBD-II scanner to see if there are any other diagnostic trouble codes that might provide
more information.
Test the ABS module - If the wiring is okay test the ABS module to see if it's functioning properly.
Test the PCM - If everything else checks out test the PCM to see if it's the problem.
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OBD-II Code U0016
Medium Speed CAN Communication Bus (-) Low
OBD-II Code U0016 indicates a communication problem within the vehicle's controller area network (CAN), specifically
related to the engine control module (ECM) and transmission control module (TCM). This code suggests that there may
be a fault in the wiring, connectors, or the modules themselves, leading to a failure in data transmission. It can result
in various performance issues and may trigger the check engine light. To resolve this code, thorough diagnostics of the
wiring and modules should be performed, along with checking for any other related trouble codes.
The OBD-II code U0016 indicates a problem with the Medium Speed Controller Area Network (CAN) Bus communication. The CAN Bus is a
system that allows various electronic components in your vehicle to communicate with each other. A problem with this communication
can lead to a variety of issues with your vehicle's functions.
Some of the possible symptoms for a OBD-II Code of U0016:
Check Engine Light - The check engine light will likely illuminate on your dashboard.
Multiple Warning Lights - You may also see other warning lights related to various systems that rely on CAN Bus communication,
such as ABS, traction control, or transmission warning lights.
Erratic Behavior - Your vehicle may experience issues with shifting, engine performance, or other functions that rely on electronic
communication.
Some of the possible causes for a OBD-II code of U0016:
Wiring issues - Damaged or corroded wires or loose connections in the CAN Bus wiring harness can disrupt communication.
Faulty Control Module - A malfunctioning control module (such as the Engine Control Module or Transmission Control Module)
can interfere with CAN Bus communication.
Ground Issues - A poor ground connection for the CAN Bus system can cause communication errors.
Short Circuit - A short circuit in the CAN Bus wiring can disrupt the signal and prevent communication.
Troubleshooting OBD-II Code U0016
Read the Code - Use an OBD-II scanner to read the code and any other related codes that may be present.
Inspect Wiring - Carefully examine the CAN Bus wiring harness for any visible damage, corrosion, or loose connections.
Repair or replace any faulty wiring.
Check Control Modules - Use a diagnostic tool to check the communication status of the various control modules connected to
the CAN Bus. If a module is found to be faulty, it may need to be repaired or replaced.
Ground Check - Verify that the CAN Bus system has a good ground connection. Clean and tighten any loose or corroded ground
connections.
Short Circuit Test - Test the CAN Bus wiring for any short circuits. If a short circuit is found, the affected wiring will
need to be repaired or replaced
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OBD-II Code U0017
Medium Speed CAN Communication Bus (-) High
OBD-II Code U0017 refers to a communication bus error related to the Controller Area Network (CAN) data link. This code typically
indicates that there is a problem with the CAN bus communication between modules in the vehicle, which could manifest as issues
with functions controlled by those modules, such as the transmission or engine management systems. Possible causes for this code
include wiring issues, faulty connectors, or defective modules. Diagnosing the problem usually involves checking the wiring and
connections, testing the affected modules, and ensuring the CAN bus is functioning properly.
The OBD-II code U0017 indicates a problem with the Medium Speed Controller Area Network (CAN) Bus. The CAN Bus is a communication system that
allows the various electronic control units (ECUs) in your vehicle to share information with each other.
Possible symptoms you may experience with a U0017 code:
Check engine light - The check engine light will likely illuminate on your dashboard.
Communication problems - Other ECUs may not be able to communicate properly with each other, which could lead to a variety of other
issues depending on which ECUs are affected.
Possible causes of a U0017 code include:
Wiring issues - Damaged or corroded wires or connectors in the CAN Bus wiring harness can disrupt communication between ECUs.
Faulty ECU - One or more of the ECUs may be malfunctioning and unable to communicate properly on the CAN Bus.
Software issues - A glitch or error in the software of one or more ECUs could cause communication problems on the CAN Bus.
What to do if you get a U0017 code:
The U0017 code is a generic code, which means it can have different causes depending on the make and model of your vehicle. It is recommended
to have a qualified mechanic diagnose the problem using a professional OBD-II scanner and the appropriate service information for your
vehicle. They will be able to pinpoint the exact cause of the U0017 code and recommend the necessary repairs.
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OBD-II Code U0018
Medium Speed CAN Communication Bus (-) shorted to Bus (+)
OBD-II Code U0018 refers to a communication issue between the Hybrid Powertrain Control Module (HPCM) and other vehicle control modules,
indicating that there may be a problem with the data bus communication network. This code can be triggered by a variety of issues, such as
faulty wiring, a defective HPCM, or communication errors with other modules. It's essential to perform a thorough diagnostic to isolate the
exact cause, check for additional codes, and inspect the integrity of the wiring and connectors involved in the communication network.
The OBD-II code U0018 indicates a problem with the Medium Speed Controller Area Network (CAN) Bus, specifically a short to battery positive (+)
voltage. The CAN bus is a communication system that allows the various electronic control units (ECUs) in your vehicle to share information
with each other.
Possible causes of a U0018 code include:
Wiring issues - A wire in the CAN bus harness may be shorted directly to a power source, causing the positive voltage to disrupt the normal communication
signals.
Faulty ECU - An ECU may be malfunctioning and causing a short circuit in the CAN bus system.
Water damage - Moisture intrusion in the wiring or an ECU can cause a short circuit.
Possible symptoms you may experience with a U0018 code:
Check engine light - The check engine light will likely illuminate on your dashboard.
Communication problems - Other ECUs may not be able to communicate properly with each other, which could lead to various other issues
depending on which ECUs are affected.
Electrical problems - The short circuit could cause other electrical problems in your vehicle, such as blown fuses or malfunctioning
components.
What to do if you get a U0018 code:
The U0018 code is a generic code, meaning it can have different causes depending on the make and model of your vehicle. It is
recommended to have a qualified mechanic diagnose the problem using a professional OBD-II scanner and the appropriate service information
for your vehicle. They will be able to pinpoint the exact cause of the U0018 code and recommend the necessary repairs.
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OBD-II Code U0019
Low Speed CAN Communication Bus
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OBD-II Code U0020
Low Speed CAN Communication Bus Performance
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OBD-II Code U0021
Low Speed CAN Communication Bus (+) Open
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OBD-II Code U0022
Low Speed CAN Communication Bus (+) Low
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OBD-II Code U0023
Low Speed CAN Communication Bus (+) High
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OBD-II Code U0024
Low Speed CAN Communication Bus (-) Open
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OBD-II Code U0025
Low Speed CAN Communication Bus (-) Low
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OBD-II Code U0026
Low Speed CAN Communication Bus (-) High
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OBD-II Code U0027
Low Speed CAN Communication Bus (-) shorted to Bus (+)
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OBD-II Code U0028
Vehicle Communication Bus A
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OBD-II Code U0029
Vehicle Communication Bus A Performance
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OBD-II Code U0030
Vehicle Communication Bus A (+) Open
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OBD-II Code U0031
Vehicle Communication Bus A (+) Low
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OBD-II Code U0032
Vehicle Communication Bus A (+) High
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OBD-II Code U0033
Vehicle Communication Bus A (-) Open
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OBD-II Code U0034
Vehicle Communication Bus A (-) Low
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OBD-II Code U0035
Vehicle Communication Bus A (-) High
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OBD-II Code U0036
Vehicle Communication Bus A (-) shorted to Bus A (+)
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OBD-II Code U0037
Vehicle Communication Bus B
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OBD-II Code U0038
Vehicle Communication Bus B Performance
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OBD-II Code U0039
Vehicle Communication Bus B (+) Open
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OBD-II Code U0040
Vehicle Communication Bus B (+) Low
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OBD-II Code U0041
Vehicle Communication Bus B (+) High
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OBD-II Code U0042
Vehicle Communication Bus B (-) Open
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OBD-II Code U0043
Vehicle Communication Bus B (-) Low
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OBD-II Code U0044
Vehicle Communication Bus B (-) High
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OBD-II Code U0045
Vehicle Communication Bus B (-) shorted to Bus B (+)