Loss of Drive
WARNING: This page is about a different car, the 2006 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.
If the TCM detects a situation that has resulted or may result in engine or transmission failure, the transmission will be placed in the neutral position.
Improper Ratio, Input Sensor Overspeed, or Engine Overspeed DTC's will cause the loss of drive.