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Home >> Jeep >> 2020 >> Grand Cherokee Trackhawk >> Repair and Diagnosis >> External Pages >> Different car >> Section 270 (8HP75 Automatic Transmission - DTCS P1D91-00 To U1477-00 - 2500HD & 3500HD) >> DTC Troubleshooting >> P1DB8-00-Unintended Torque Applied While In Neutral >> 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.

The purpose of the diagnostic is to detect an unwanted power flow in the transmission. A rationality check of the ratio of input speed to engine speed is done while no power flow is requested.

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