P0502 CHEVROLET - Vehicle Speed Sensor Circuit Low Input
When is the code detected?If the Powertrain Control Module (PCM) detects a low vehicle speed when there is a high engine speed in a drive gear range, then DTC P0502 sets.
P0502 Chevrolet DescriptionThe Vehicle Speed Sensor (VSS) assembly provides vehicle speed information to the Powertrain Control Module (PCM). The VSS assembly is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage as rotor teeth on the transmission output shaft pass through the sensor's magnetic field. The AC voltage level and the number of pulses increase as the speed of the vehicle increases. The PCM converts the pulsing voltage to vehicle speed. The PCM uses the vehicle speed signal to determine shift timing and torque converter clutch (TCC) scheduling.
Vehicle Speed Sensor Location Example: