U1910 – CAN Communication Bus Fault.

The ODBII code U1910 indicates a fault in the CAN (Controller Area Network) communication bus, suggesting a problem with data transmission between modules in the vehicle’s network.

The severity of ODBII code U1910 CAN Communication Bus Fault is generally considered moderate to severe.

Common Causes For: U1909 U1909: “BCM Communication Failure”

• Faulty CAN bus wiring or connectors
• Defective CAN bus module
• Short circuit in the CAN bus
• Open circuit in the CAN bus
• Interference from other electrical components
• Poor ground connections
• Faulty or incompatible aftermarket accessories
• Software issues or bugs in the vehicle’s control modules

Common misdiagnosis for U1910 CAN Communication Bus Fault.

• Faulty Engine Control Module (ECM)
• Defective Body Control Module (BCM)
• Bad wiring or connectors
• Malfunctioning sensors
• Issues with the powertrain control module (PCM)
• Battery or charging system problems
• Faulty CAN bus transceiver
• Incorrectly programmed modules

Common Troubleshooting Steps

The OBD-II code U1910 indicates a CAN (Controller Area Network) communication bus fault. This code typically suggests that there is a problem with the communication between various modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Other codes can provide additional context for the issue.
• Inspect the Wiring and Connectors:
• Visually inspect the wiring harnesses and connectors associated with the CAN bus. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors at the ECM (Engine Control Module), BCM (Body Control Module), and any other modules that communicate over the CAN bus.
• Test the CAN Bus Voltage:
• Use a multimeter to check the voltage levels on the CAN High (CAN H) and CAN Low (CAN L) wires. The typical voltage levels should be around 2.5V when idle and should vary when data is being transmitted.
• If the voltage levels are outside the expected range, there may be a fault in the wiring or a module.
• Check for Short Circuits or Open Circuits:
• Use a multimeter to check for continuity in the CAN bus wiring. Look for any short circuits to ground or power, as well as open circuits that may interrupt communication.
• Inspect Modules:
• If the wiring and connectors appear to be in good condition, the issue may lie with one of the modules on the CAN bus. Disconnect each module one at a time and check if the code clears or if communication is restored.
• If a specific module is found to be causing the issue, it may need to be repaired or replaced.
• Check for Interference:
• Ensure that there are no aftermarket devices or modifications that could be interfering with the CAN bus communication. This includes things like alarm systems, stereo systems, or other electronic devices.
• Scan for Module Communication:
• Use a scan tool to check if all modules on the CAN bus are communicating properly. If some modules are not responding, it may indicate a problem with those specific modules.
• Perform a Network Test:
• Some advanced scan tools have the capability to perform a network test to check the integrity of the CAN bus. This can help identify issues that may not be visible through visual inspection.
• Check for Software Updates:
• In some cases, a software update for the vehicle’s modules may resolve communication issues. Check with the manufacturer for any available updates.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures related to the CAN bus and U1910 code. This can provide additional insights and steps tailored to your vehicle model. If these steps do not resolve the issue, it may be necessary to consult a professional technician or automotive specialist for further diagnosis and repair.