U1400 Implausible TPS Signal Received

U1400 code

U1400 code - The messages sent on the Can bus are distnguished 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 this DTC when the TCM detects an incorrect can id from the ECM/PCM.

Possible causes U1400 code:

- TIPM can bus DTCs present

- ECM/PCM DTCs present

- Transmission control module

Diagnostic test U1400 code

Step 1. Can For TIPM Can Bus DTCs

With the scan tool, read TIPM DTCs.

Are there any TIPM can bus DTCs present ?

Yes, refer to 28 DTC based diagnostics/module, totally integrated power (TIPM) diagnosis and testing for diagnostics procedures and other possible causes. Perform the NAG1 transmission verification test. Refer to 28 DTC based diagnostics/module, transmission control (TCM) standard procedure.

No, go to step 2.

Step 2. Check if ECM/PCM DTCs are present

With the scan tool, read engine DTCs.

Are there any engine DTCs present ?

Yes, 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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