U04101 Implausible data received from ECM/PCM

U04101 code - The messages sent the can bus are distinguished by an indentifier (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 message received at least once, and no U0002 Can bus off performance DTC present. Set condition when the TCM detects an incorrect Can message from the engine control module (ECM).

Possible causes U04101 code:

- TIPM can bus DTCs

- Engine DTCs

- Transmission control module

Diagnostic test U04101 code

Step 1. Check if TIPM can bus DTCs are present

With the scan tool, read TIPM DTCs.

Are there any TIPM CAN BUS DTCs present? 

Yes, refer to totally integrated power (TIPM) diagnosis and testing for diagnostic procedures and other possible causes. 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 any 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 circuits. If no problems are found, replace the TCM in accordance with the service information. Perform NAG1 Transmission Verification Test.

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