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Home >> Chrysler >> 2012 >> 300 Limited, 4WD, Gas >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Transmission Control Module (TCM) - Nag1 Automatic Transmission) >> Diagnosis And Testing >> P1644-Incorrect Variant/Configuration >> Theory Of Operation

Theory Of Operation

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The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. If the TCM detects that the variables that dictate the vehicle application are not present, the controller will enter Limp-in mode and illuminate the MIL.

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