The code means the ECM can't properly communicate with the BCM, so it's likely a wiring, connector, or module fault rather than something wrong with the engine itself. Possible causes include:
* Faulty BCM: The BCM itself might be malfunctioning.
* Faulty ECM: While less likely given the code's focus on the BCM, a faulty ECM could also disrupt communication.
* Wiring harness issues: Damaged, corroded, or loose wires between the ECM and BCM are common culprits. This includes the connectors at each end.
* Fuse or relay problems: A blown fuse or faulty relay in the communication circuit could interrupt the connection.
* CAN bus issues: The Controller Area Network (CAN) bus is used for communication; a problem with the CAN bus itself could cause this code.
To diagnose the problem, you'll need:
* A professional scan tool: A basic OBD-II reader may show the code, but a more advanced scan tool is necessary to get further diagnostic information and check communication data buses. This will allow a technician to determine which module or circuit is the source of the communication failure.
* A qualified mechanic: Troubleshooting this requires specialized knowledge and tools. Attempting to fix this yourself without the proper expertise could lead to further damage.
Simply clearing the code won't fix the underlying problem; the root cause needs to be identified and addressed. Ignoring it could lead to malfunctions in various vehicle systems.
