U0200 signals that the vehicle’s network has detected a loss of communication with Door Control Module B. This means the module is not sending or receiving messages on the CAN bus.
The module's internal electronics can develop a fault that stops it from communicating on the CAN bus.
Corroded, broken, or loose pins in the harness between the module and other nodes can interrupt communication.
A short, open, or excessive voltage on the shared CAN lines can cause loss of communication with the door control module.
Insufficient voltage or poor grounding to the module can prevent it from operating correctly.
A PCM malfunction can affect overall network operation, but this is rare; the PCM is usually not the primary cause.
No, the PCM is rarely the cause; the code usually points to the door control module, wiring, or CAN bus.
A blown fuse in the door control circuit can prevent communication, so checking fuses is part of the diagnostic process.
No, the actuator is separate; the code relates to communication, not the mechanical actuator.
Diagnosis typically requires 1–2 hours to inspect wiring, test modules, and verify communication.