U1405 Implausible Minimum Engine Torque Signal

U1405 code

U1405 code - The messages sent on the can bus are distinguished by an identifier (ID). Each can id 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 continuously with the ignition on, one valid can id received at least once, and no U0002 can bus off performance DTC present. Set condition this DTC when the TCM detects an incorrect can id from the ECM/PCM.

Possible causes U1405 code:

- TIPM Can Bus present

- ECM/PCM DTCs present

- Transmission control module

Diagnostic test U1405 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) terminal for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM in accordance with the service information. Perform NAG1 Transmission Verification Test.

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