P0500: The vehicle speed sensor is not sending a reliable signal
Vehicle Speed Sensor Malfunction
The vehicle speed sensor signal is missing or wrong, so the speedometer, shifting or traction control may not work. Get it checked within a few days. If shifting goes wrong, stop driving.
Stop driving and get help if
- The check engine light is flashing
- The temperature gauge runs high, or you see steam (overheating)
- The car loses power, hesitates badly or stalls
- You smell burning or see smoke
- A brake warning light comes on, or the brakes feel different
Pull over as soon as you can, turn the engine off, and call a tow or roadside help.
What it means
The vehicle speed sensor (VSS) feeds the transmission computer and the instrument cluster with speed data. It is also used for ABS calculations, traction control, and cruise control. P0500 means the signal is missing or erratic. On older vehicles, the VSS is a standalone sensor on the transmission or differential. On newer vehicles, speed is calculated from wheel speed sensors already used by the ABS system. A faulty ABS ring or corroded wheel bearing can produce this code on those platforms.
Common causes
- Faulty vehicle speed sensorOn standalone VSS vehicles, the sensor itself fails. Common on transmissions with high mileage.
- Damaged wiring or connector at the VSSThe sensor is near moving, heat-generating drivetrain components, making wiring damage common.
- Damaged or missing reluctor ring (tone ring)The toothed ring the sensor reads can lose teeth or corrode.
- Failed wheel speed sensor (on ABS-integrated systems)On modern vehicles, wheel speed sensors feed both ABS and VSS data. Check ABS codes too.
- Failed PCM or TCMRare. Suspect only after sensor and wiring check out clean.
What the fix could involve
From the cheaper fix to the bigger one. Prices depend on your car, your area and the shop, so ask for a written quote that names the part and the labor before you approve it.
- Vehicle speed sensor replacement
- Wheel speed sensor replacement
- Wiring repair
Symptoms
- Speedometer not working or reading erratically
- Harsh or erratic transmission shifts
- Cruise control inoperative
- Traction control or stability control warning lights on
- Check engine light on
What to do next
Note whether the speedometer is working. If it is not, the signal is fully missing. Check for ABS or traction control warning lights; those additional codes help pinpoint whether the issue is at a wheel sensor. Inspect the VSS connector first; it is a common failure point. Look up whether your specific vehicle uses a standalone VSS or reads speed from the ABS wheel sensors.
Lewis shows the live vehicle speed reading from the engine computer alongside any related codes, so you can see whether the speed signal is reaching it. Get Lewis on the App Store or Google Play.
FAQ
- Is it illegal to drive with a broken speedometer?
- In most US states, yes. A non-functioning speedometer is technically a vehicle equipment violation. Beyond legality, you cannot monitor your speed safely.
- Will P0500 cause bad transmission shifts?
- Yes. The transmission uses vehicle speed data to determine shift points. Without a valid signal, it may shift too early, too late, or not at all in some ranges.
- Can this code trigger from a bad ABS sensor?
- Yes, on vehicles that derive vehicle speed from the ABS wheel speed sensors. Check for ABS codes alongside P0500.
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