U1408 Implausible brake signal received

U1408 code

U1408 code -  Theory of operation 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 : Continuously with the ignition on. one valid Can id received at least once, and no U0002 can bus off performance DTC present.

Possible causes U1408 code:

- TIPM Can Bus DTCs present

- ABS DTCs present

- Transmission control module

Diagnostic test U1408 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 Transmission Verification Test.

No, go step 2

Step 2. Check if ABS DTCs are present 

With the scan tool, read ABS DTCs.

Are there any ABS DTCs present ?

Yes, perform NAG1 Transmission Verification Test.

No, using the schematic 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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