P1DB8 – Unintended Torque Applied While In Neutral

P1DB8 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1DB8 Possible Causes

Transmission fluid level incorrect,Faulty Transmission Control Module (TCM)

P1DB8 Description

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.