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Home >> Jeep >> 2009 >> Commander Limited, 4.7 P, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> P1637-TCM Internal-EEPROM Performance >> Theory Of Operation

Theory Of Operation

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The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. This DTC indicates that there is an internal error with the controllers Random Access Memory. If detected, the controller will enter Limp-in mode and illuminate the MIL.