Powertrain Control Module (PCM)

U0402-IMPLAUSIBLE DATA RECEIVED FROM TCM

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously while the system is active.

- Set Condition:
An error message has been received over the BUS from the Transmission Control Module (TCM).





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC

NOTE: Diagnose all CAN B and C communication DTCs before continuing.

1. Ignition on, engine not running.
2. With a scan tool, view DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the INTERMITTENT DTC diagnostic procedure. Intermittent Condition Test

2. TCM COMMUNICATION RELATED DTCs IN OTHER MODULES
1. With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs "Logged Against" the TCM at this time?

Yes

- Replace and program the Transmission Control Module (TCM). 8HP45 TCM Programming Procedure
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test.

No

- Replace and program the Powertrain Control Module. PCM/ECM Reprogramming
- Perform the PCM VERIFICATION TEST. Powertrain Verification Test