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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 1897 (8HP75 Automatic Transmission - DTCS P1D91-00 To U1477-00 - 2500HD & 3500HD) >> DTC Troubleshooting >> P1DAC-00-Engine Speed Undetermined >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

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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