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Home >> Chrysler >> 2012 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Transmission Control Module (TCM) - DTCS P1D94 To U1479 - 8HP45 Automatic Transmission) >> Diagnosis And Testing >> P1DAB-Vehicle Speed Undetermined >> Theory Of Operation

Theory Of Operation

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The vehicle speed sensor is a continuous test that monitors the vehicle speed sensor for lack of activity. The test will not run if a limp-in exists for MAP, Throttle Position, and Engine Coolant Temperature. If vehicle speed sensor is below a minimum threshold for a period of time after the vehicle is operated at a sufficient load, a failure will be indicated.