B2201 is a body control system code indicating the scan tool cannot communicate with the vehicle's Traffic Master module (the central gateway for data bus communications). This is a network communication failure, not an engine problem.
The gateway module itself has failed and can no longer communicate on the CAN bus network.
Damaged, corroded, or loose connectors and wiring to the module causing open communication lines.
Blown fuse, faulty relay, or broken power wire preventing the module from powering up.
Corroded, loose, or damaged ground wire causing the module to function improperly.
Another module on the network shorting or failing can bring down communication for the entire bus.
Extremely rare - the main vehicle computer could have a network communication issue affecting the entire system.
No. The PCM/ECM is almost never the cause of B2201. Replacing it would be unnecessary expense in virtually all cases. The problem is almost always the Traffic Master module itself or its wiring.
The vehicle may still run, but some electrical systems, safety features, or accessories may not function properly. Have it diagnosed reasonably soon.
Yes, low system voltage can cause CAN bus communication failures. It's worth checking battery and charging system health, but this is usually not the sole cause.
It is the central gateway or master controller for the vehicle's data communication network (CAN bus), routing messages between different control modules in the vehicle.