U140F Implausible engine variant data

U140F code

U140F code - The messages sent on the Can bus are distinguised 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 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 ECM/PCM. 

Possible causes U140F code:

- TIPM Can Bus DTCs present

- ECM/PCM DTCs present

- Transmission control module

Diagnostic test U140F 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 ECM/PCM DTCs are present

With the scan tool, read ECM/PCM DTCs. 

Are there any ECM/PCM 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 circuits. if no problems are found replacethe TCM in accordance with the service information. Perform NAG1 Transmission Verification Test.

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