P1634 TCM Internal-Internal Watchdog performance
P1634 code - The transmission control module (TCM) performs various internal tests to verify proper controller operation. This DTC indicates that controllers microprocessor internal watchdog has detect an error. If the TCM microprocessor detects an internal watchdog error, the controller will enter limp in mode and illuminate the Mil. When monitored continuously with the ignition on. Set condition if the TCM microprocessor internal watchdog detecs an error.
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 terminals 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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