U0401

U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Continuously with the ignition on, one valid CAN message received at least once, and no U0002-CAN C Bus Off Performance DTC present.

- Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Engine Module.





Diagnostic Test

1. CHECK FOR DTC U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM
NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition switch from off to on.
With the scan tool, read DTCs.
Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?

Yes

- Go to 2

No

- Refer to the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

Diagnostic Test

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

Yes

- Diagnose and repair the DTC(s).

No

- Go to 3

3. CHECK IF ENGINE DTCs ARE PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine 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.