Vehicle Speed Sensor (VSS)
What it is
The vehicle speed sensor measures how fast the vehicle is moving, usually from the transmission output or a wheel. The computer, speedometer and transmission all rely on its signal.
What it does
It feeds road speed to the engine and transmission computers and the speedometer. A failing VSS causes a dead or erratic speedometer, harsh or wrong shifts, cruise control dropouts and code P0500.
Symptoms of failure
- Code P0500 (vehicle speed sensor malfunction)
- Speedometer reading zero or jumping around
- Harsh, late or erratic automatic shifts
- Cruise control will not engage
- Check engine light and sometimes ABS/traction light
Common fault codes
Which vehicles need it
Most vehicles with an electronic speedometer. On many modern cars the ABS wheel-speed sensors supply this data instead of a single VSS.
Replacement cost
| DIY (part only) | $20–$90 |
|---|---|
| At a shop (parts + labor) | $110–$280 |
| Replacement interval | No set interval — replace on failure. |
| DIY difficulty | Easy–Moderate (DIY) — one connector and bolt at the transmission; access varies |
| Recommended brands | Standard Motor Products, Dorman, ACDelco, OEM |
Where to buy the part
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Frequently asked questions
Can a speed sensor cause shifting problems?
Yes. The transmission uses vehicle speed to decide when to shift, so a failing VSS often causes harsh, late or erratic shifts along with a dead speedometer and a P0500 code.
Does my car have a VSS or wheel-speed sensors?
Older cars use a single vehicle speed sensor at the transmission; many modern cars derive speed from the ABS wheel-speed sensors. The fault code and wiring diagram tell you which your car uses.