P1915 – Internal Mode Switch Start/Wrong Range

P1915 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1915 Possible Causes

Faulty Internal Mode Switch,Internal Mode Switch harness is open or shorted,Internal Mode Switch circuit poor electrical connection

P1915 Description

The manual shift detent lever with shaft position switch assembly, or Internal Mode Switch (IMS) assembly is a sliding contact switch attached to the control valve body within the transmission. The 4 inputs to the Transmission Control Module (TCM) from the switch indicate which position is selected by the transmission manual shaft. The input voltage at the TCM is high when the switch is open and low when the switch is closed to ground. The state of each input is displayed on the scan tool as IMS. The IMS input parameters represented are transmission range signal A, Signal B, signal C, and signal