U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM
For a complete wiring diagram Refer to Section 8W
- 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 AWD Control Module detects an incorrect CAN message from the Power Control Module (PCM).
| Possible Causes |
| TIPM NOT CONFIGURED CORRECTLY |
| ABM CAN BUS DTCS |
| ENGINE DTCS |
| ALL WHEEL DRIVE (AWD) CONTROL MODULE |
Diagnostic Test
1. CHECK FOR DTC U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCMNOTE: 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 DTC's.
Cycle the ignition switch from off to on.
With the scan tool, read DTC's.
Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION diagnostic procedure.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).
Diagnostic Test
2. CHECK IF TIPM CAN BUS DTC'S ARE PRESENTWith the scan tool, read TIPM DTCs.
Are there any TIPM CAN BUS DTC's present?
Yes
- Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diagnose the appropriate symptom.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).
No
- Go To 3
3. CHECK IF ENGINE DTC'S ARE PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine DTC's present?
Yes
- Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).
No
- Using the schematics as a guide, check the AWD Control 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 AWD Control Module per the Service Information.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE).