P1791 – Vehicle Speed Sensor Range/Performance Problem

P1791 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1791 Possible Causes

Faulty Vehicle Speed Sensor,Vehicle Speed Sensor harness is open or shorted,Vehicle Speed Sensor circuit poor electrical connection

P1791 Description

The Vehicle Speed Sensor (VSS) is driven by the differential. It generates a pulsed signal from an input 5 volts. The number of pulses per minute increases/decreases with the speed of the vehicle.