U0423 Implausible data received from cluster/ccn

U0423 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 cluster/ccn.

Possible causes U0423 code: 

- Can Bus DTCs present

- Cluster/ccn module DTCs present 

- Transmission control module

Diagnostic test U0423 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 cluster/ccn DTCs are present 

With the scan tool, read cluster/ccn dtcs.

Are there any cluster/ccn DTCs present ?

Yes, refer to DTC based diagnostics and perform the appropriate diagnostic procedure. Perform the NAG1 transmission verification test. 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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