U0404 Implausible data received from ESM


U0404 code - 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 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 electronic shift module (ESM).

Possible cause U0404 code:

- TIPM Can bus DTCs present

- Electronic shift module DTCs present

- Transmission control module

Diagnostic test  U0404 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, 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. electronic shift module DTCs present 

With the scan tool, read electronic shift module (ESM) DTCs.

Are there any ESM DTCs present ?

Yes, refer to DTC based diagnostics and perform the appropriate diagnostic procedure.

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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