Speed, idle & inputs · Powertrain · generic (SAE-defined)
P0500: Vehicle Speed Sensor "A"
P0500 means the engine or transmission computer is not receiving a usable signal from the vehicle speed sensor (VSS), or the signal does not make sense for current driving conditions.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How P0500 sets
The powertrain control module (PCM) compares the vehicle speed sensor signal with other inputs, such as engine speed, load, and gear. If the engine appears to be driving the vehicle but the speed signal stays at zero, drops out, or is erratic, the PCM sets P0500. On some vehicles the speed signal comes from wheel speed sensors through the ABS module rather than a transmission-mounted sensor. Conditions vary by manufacturer.
Common causes of P0500
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Failed vehicle speed sensor
- Damaged or corroded wiring or connector
- Metal debris on a magnetic sensor tip
- Damaged sensor drive gear or tone ring
- Wheel speed sensor or ABS module fault on vehicles that share the signal
- Instrument cluster or network communication problem
P0500 symptoms
- Check engine light on
- Speedometer inaccurate, erratic, or not working
- Harsh, early, or late automatic transmission shifts
- Cruise control not working
- Possible ABS or traction control warning lights
How P0500 is diagnosed
- Scan all modules, including ABS and transmission, for related codes
- Review freeze frame data to confirm the vehicle was moving when the code set
- Watch vehicle speed in live data during a road test and compare with the speedometer and wheel speeds
- Inspect the sensor connector and harness for damage
- Remove the sensor and check for metal debris or a damaged tip
- Test sensor output with an oscilloscope or meter while rotating the drive
- Check the tone ring or drive gear for damage
Typical fixes for P0500
- Replace the vehicle speed sensor
- Repair wiring or connector damage
- Clean debris from a magnetic sensor
- Replace a damaged tone ring or drive gear
- Repair the ABS wheel speed sensor or module where it supplies vehicle speed
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Manufacturer notes
Definitions can vary by manufacturer; check factory service information. Older SAE wording is "Vehicle Speed Sensor Malfunction."
Related codes & warning lights
P0500 FAQ
What does code P0500 mean?
P0500 means the engine or transmission computer is not receiving a usable signal from the vehicle speed sensor (VSS), or the signal does not make sense for current driving conditions. The standard definition is "Vehicle Speed Sensor "A"."
Can I drive with a P0500 code?
Often yes for short distances, but use caution. A missing speed signal can cause an inaccurate or dead speedometer, harsh or erratic automatic shifting, and disabled cruise control, and may affect antilock brake (ABS) or traction warnings. Get it repaired soon.
Why does my transmission shift strangely with P0500?
The transmission uses vehicle speed to decide when to shift. Without a valid speed signal, it may fall back to default shift patterns or shift harshly.
Can a bad wheel speed sensor cause P0500?
Yes, on vehicles that calculate vehicle speed from the ABS wheel speed sensors. In that case, ABS codes are often stored as well.
Keep researching
More speed, idle & inputs codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.