Vehicle Speed Sensor Circuit Intermittent
Table of contents
P0503 PONTIAC Possible Causes
- Faulty Vehicle Speed Sensor
- Vehicle speed sensor harness or connectors is open or shorted
- Vehicle speed sensor circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How do I fix code P0503 PONTIAC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P0503 PONTIAC code
The cost of diagnosing the P0503 PONTIAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
When the Powertrain Control Module (PCM) detects an unrealistically large drop in the vehicle speed, then DTC P0503 sets.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Speedometer may not work properly
- Transmission shifting problem
P0503 PONTIAC Description
The 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.