Faulty Transmission Range Switch
Transmission Range Switch harness is open or shorted
Transmission Range Switch circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
The transmission range switch is attached to a control shaft. Operating the shift lever makes the control shaft rotate via the shift cable. The A/T gear position indicator shows which position is selected according to the Low/High signal combinations, which vary based on the control shaft rotational angle. The control shaft changes the position of the transmission range switch, activates the manual valve, and switches hydraulic pressure to shift the transmission through forward/neutral/reverse. The transmission range switch signal is used to determine the shift schedule. The voltage is high (5 V or 12 V) at the Powertrain Control Module (PCM) input terminal when each transmission range switch position is open, and it is low (0 V) when each switch is closed. If the RVS switch is OPEN with the shift lever in R while shifting between P, R, and N, the PCM detects a RVS switch OPEN failure and a Diagnostic Trouble Code (DTC) is stored.