Gear-Shift Position Sensor

Fig 1: Gear-Shift Position Sensor

Courtesy of VOLVO CARS CORPORATION

The gear-shift position sensor is mounted on the top of the gearbox housing, on the gear shift linkage rod. The gear selector contains a Park / Neutral position (PNP) switch and connectors which inform the transmission control module (TCM) about which gear is selected and if the reverse gear is selected so that the reversing lamps can be lit. The gear-shift position sensor is a position switch which is supplied via +15. A number of trailing contacts supply power to the sensor outputs. The combination of pins A, B, C and PA indicate the current gear selector position (see the table below). The trailing contacts can either be closed or open.

There are diagnostics for the gear-shift position sensor.

Fig 2: Identifying The Gear-Shift Position Sensor Table

Courtesy of VOLVO CARS CORPORATION

Table for the gear-shift position sensor 

The value indicates the position of the gear-shift position sensor (A, B, C and PA), see the table.

• = High signal (open)

- = Low signal (grounded)