U0424 Implausible data received from HV AC control

U0424 code -  The messages sent on the Can bus are distinguished by an identifier (ID). Each 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 this DTC when the TCM detects an incorrect Can Id from the HVAC control module.

Possible causes U0424 code:

- Can Bus DTCs present

- HV AC DTCs present 

- Transmission control module

Diagnostic test U0424 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. Check if HV AC DTCs

With the scan tool, read HV AC DTCs.

Are there any HV AC DTCs present ?

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