What it means
A control module has detected that the software in Body Control Module A is incompatible with its own software or configuration. The affected body functions depend on the vehicle.
How it works
Body Control Module A manages body electrical functions, which vary by vehicle and can include lighting, locks, and other equipment. This code sets when another module finds BCM A’s software or configuration incompatible with its own, potentially disabling some body functions or causing related warnings.
Common causes
Most likely first.
- Incorrect or incompatible Body Control Module A software
- Module replacement without required programming or configuration
- Incorrect module part number
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and record freeze-frame data and body-function, communication, or configuration codes.
- Check which body functions are affected and whether the fault began after BCM A was replaced or programmed.
- Read BCM A’s identification, software version, and configuration, and compare them with vehicle-specific service information.
- Inspect the BCM A connectors, grounds, power feeds, and network wiring for loose or corroded connections.
- Verify the module’s part number and software compatibility, then perform required configuration or programming using the manufacturer’s procedure.
Common fixes
- Repair a loose or corroded BCM A connector or ground.
- Restore the correct BCM A configuration using the manufacturer’s procedure.
- Program compatible BCM A software.
- Replace an incorrect-part-number BCM A with the compatible unit and complete required programming.
Can I keep driving?
Driving may be reasonable if essential functions such as exterior lights, wipers, and door latches work normally. Avoid driving if a fault affects visibility, signaling, or secure latching, and arrange prompt diagnosis.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.