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Home >> Jeep >> 2018 >> Grand Cherokee Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (8HP70 Automatic Transmission - DTCS P0219-00 To P1D92-00) >> DTC Troubleshooting >> P1731-00-Incorrect Gear Engaged >> Theory Of Operation

Theory Of Operation

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The Transmission Control Module (TCM) constantly calculates the transmission ratio based on the Input Speed Sensor signal and Output Shaft Speed signal. This diagnostic will detect if the transmission is trying to mechanically shift into a different gear than what the TCM commanded.

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