U1406 Implausible maximum engine torque signal
U1406 code - 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 this DTC when the TCM detect an incorrect CAN ID from the ECM/PCM.
Posssible causes U1406 code:
- TIPM Can Bus DTCs present
- ECM/PCM DTCs present
- Transmission control module
Diagnostic test U1406 code
Step 1. Check for TIPM Can Bus DTCs
With the scan tool, read TIPM DTCs.
Are there any TIPM Can Bus DTCs present ?
Yes, perform NAG1 Transmission Verification Test.
No, go to step 2.
Step 2. Check if engine DTCs are present
With the scan tool, read engine DTCs.
Are there engine DTCs present ?
Yes, perform 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 circuit. If no problems are found, replace the TCM in accordance with the service information. Perform NAG1 Transmission Verification Test.
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