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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 85 (8P75PH Automatic Transmission - DTCS P1C6E-00 To P2880-00) >> DTC Troubleshooting >> P1DDD-00 TCM Monitoring Performance - Unable To Disengage Drive Or Reverse >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different variant/trim than selected.

The purpose of the diagnostic is to detect a failure in the activation of the pressure regulators during gear disengagement or while NEUTRAL or PARK position is engaged. This is a rationality check between the activated pressure regulators and the shifter selected gear.