U1509 Implausible engine variant messages data length

U1509 code


U1509 code - Theory of operation the messages sent on the can bus are ditinguished by an identifier (ID). Each can id is defined to contain a certain number of bytes. The transmission control modul (TCM) verifies that it has received the proper number of bytes for each id. When monitored is 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 ECM/PCM.

Possible causes U1509 code:

- TIPM Can Bus DTCs present 

- ECM/PCM DTCs present

- Transmission control module

Diagnostic test U1509 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 transmisson 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, refer to DTC based diagnostics and perform the appropriate diagnostic procedure. Perform NAG1 transmisson verification test.

No, using the schematics as a guide, check the transmission control module (TCM) for corrosion, damage, or terminal push out. Pay particular attention to all power ground circuits. If no problems are found, replace the TCM.   Perform NAG1 transmisson verification test.                                                                                                                                                                                                                                                                                                                                                                                                                                  

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