U0431
NetworkModule Communicationmoderate severityInvalid Data Received From Body Control Module A
What U0431 Means
The network is receiving invalid or implausible data from Body Control Module A. Since the BCM manages many body electronics, this can cause a range of odd electrical faults.
Symptoms
- Multiple electrical features malfunction
- Warning lights on dash
- Lights, locks, or windows act erratically
Common Causes
- Faulty body control module
- Wiring or connector corrosion at BCM
- Low battery voltage or bad ground
- CAN bus communication fault
Diagnostic Steps
- Scan all modules for related codes
- Check battery voltage and BCM grounds
- Inspect BCM wiring and connectors
- Test CAN bus signals to the BCM
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