U1503

U1503-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM BCM

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Continuously with the ignition on.

- Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Body Control Module (BCM).





Diagnostic Test

1. CHECK IF BCM CAN BUS DTCs ARE PRESENT
With the scan tool, read BCM DTCs.
Are there any BCM CAN BUS DTCs present?

Yes

- Diagnose and repair the DTC(s).
- Perform ABS VERIFICATION TEST. ABS Verification Test.

No

- Replace the Anti-Lock Brakes Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.