U0401-00

U0401-00 IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM



- When Monitored:
With the ignition on for five seconds.

No CAN bus circuit error conditions present.

No lost communication with PCM conditions present.

No system undervoltage or overvoltage conditions present.

- Set Condition:
The Integrated Trailer Brake Module (ITBM) is receiving implausible data for engine RPM, torque, or engine coolant temperature from the PCM.





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.

1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.

Does the scan tool display: U0401-00 IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?

Yes

- Go To 2

No

- Go To 4

2. CHECK IF TIPM CAN BUS DTCS ARE PRESENT
1. With the scan tool, read TIPM DTCs.

Are there any TIPM CAN BUS DTCs present?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

3. POWERTRAIN DTCS PRESENT
1. With the scan tool, read PCM DTCs.

Are there any active DTCs present?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Replace the Integrated Trailer Brake Module (ITBM).
- Perform ITBM VERIFICATION TEST. Integrated Trailer Brake Module (ITBM) Verification Test.

4. INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
3. Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
4. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

Were there any problems found?

Yes

- Repair as necessary.
- Perform ITBM VERIFICATION TEST. Integrated Trailer Brake Module (ITBM) Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.