Shift Interlock Solenoid

The shift interlock solenoid is located on the side of the selector lever assembly. The solenoid is connected to two locking levers, which engage with the base of the selector lever and lock it in the P and N positions when the solenoid is de-energized. Operation of the solenoid is controlled by the transmission control module (TCM).

When the ignition is on and the brake pedal is pressed, the transmission control module (TCM) energizes the solenoid and the selector lever can be moved from the P or N position. This prevents the selector lever from being moved to the D or R position unintentionally, and the application of the brakes prevents the vehicle 'creeping' when the transmission engages gear.

Movement of the selector lever from the P or N positions is prevented if the transmission control module (TCM) senses the engine speed is above 2500 rev/min, even if the brake pedal is pressed.

The selector lever is locked in the N position during the transfer box changing range from high to low or vice versa.

If there is a vehicle electrical failure, or failure of the interlock solenoid or associated wiring, it is possible to move the selector lever from the P position by removing the selector lever, and the switch pack and finisher, and lifting the white tab on the rear of the selector lever assembly. While holding the tab in this position, the selector lever can be moved from the P position.