P1633 TCM internal test external watchdog
P1633 code - The transmission control module (TCM) perform various internal tests to verify proper controller operation. This DTC indicates that there is an issue with the TCMs external watchdog. If the TCM detects an error with the controllers external watchdog, failed the power up test, the controller will enter limp in mode and iluminate the Mil.
When monitored continuously with the ignition on. Set condition if the TCM detects an error with the controllers external watchdog failed the power up test.
Possible cause:
- Transmission control module (TCM)
Transmission control module (TCM)
Repair, 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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