U1502

U1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TCM

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 Transmission Control Module (TCM).





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

- Go To 2

2. CHECK IF TRANSMISSION DTCS ARE PRESENT
With the scan tool, read Transmission DTCs.
Are there any Transmission DTCs present?

Yes

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

No

- Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.