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Home >> Jeep >> 2014 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> P1633-TCM Internal - Test External Watchdog Performance >> Theory Of Operation
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Theory Of Operation

The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. This DTC indicates that there is an issue with the TCM's 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 illuminate the MIL.

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