Transmission Control Module (TCM)

U0423-IMPLAUSIBLE DATA RECEIVED FROM CLUSTER/CCN



Theory of Operation

The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.

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

- Set Condition:
When the TCM detects an incorrect CAN ID from the CLUSTER/CCN.





Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Testing and Inspection.

1. CHECK FOR TIPM CAN BUS DTCS
1. With the scan tool, read TIPM DTCs.

Are there any TIPM CAN BUS DTCs present?

Yes

- Testing and Inspection Diagnostic procedures and other possible causes.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test.

No

- Go To 2

2. CHECK IF CLUSTER/CCN DTCS ARE PRESENT
1. With the scan tool, read CLUSTER/CCN DTCs.

Are there any CLUSTER/CCN DTCs present?

Yes

- Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test.

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test.