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Home >> Jeep >> 2021 >> Grand Cherokee L Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (8HP75 Automatic Transmission - DTCS P1D79-00 To U1489) >> Diagnosis And Testing >> P1DAC-00: Engine Speed Undetermined >> Theory Of Operation

Theory Of Operation

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This diagnostic monitors for a double failure of the Engine Speed signal received via Controller Area Network (CAN) and an electrical or rationality failure of the Input Speed Sensor. If the Transmission Control Module (TCM) detects a failure with both tests this Diagnostic Trouble Code (DTC) will set.

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