What P0500 means
P means powertrain (engine and transmission). The 0 marks a generic code defined by SAE, so the same number means the same thing across makes. The third character, 5, places it in the vehicle speed, idle control and auxiliary inputs subsystem; the last two digits identify the specific fault.
The vehicle speed sensor reports road speed, commonly from the transmission output shaft or the ABS wheel speed sensors. The engine and transmission computers use it for shift points, cruise control, idle control and the speedometer.
The letter "A" distinguishes between two or more of the same component on one vehicle. Which physical part is "A" is set by the manufacturer, so confirm it in the service information before replacing anything.
What “Circuit” means here
"Circuit" is the broadest fault type in the standard. The module has found the vehicle speed sensor (VSS) circuit electrically unusable: the signal is missing, outside its electrical limits, or the module's own self-test of the circuit failed. Some vehicles set this instead of the more specific low/high codes; others set it alongside them. Either way the first suspect is the wiring and connector, then the component, and only then the module.
What you may notice
Symptoms depend on the vehicle and on how the module responds to the fault. Any of these can accompany P0500:
- Speedometer erratic or not working
- Harsh or wrong shifts on automatic transmissions
- Cruise control not working
- ABS warning on vehicles that share wheel speed data
Where to start diagnosing P0500
- Check whether the speedometer works; if it shares the sensor, that narrows the fault quickly.
- Inspect the sensor connector and wiring at the transmission or wheel.
- Check for related ABS wheel speed codes.
- Inspect the sensor tip for metal debris.
Clear the code only after recording freeze frame data: it shows the engine speed, load and temperature at the moment the fault set, which is often the best clue to reproducing it.
Live data to watch
These standard OBD2 values relate to P0500. Support varies by vehicle; a value your car does not report will simply be missing.
| Value | What to look for |
|---|---|
| Vehicle speed (PID 0x0D) | Compare with GPS speed. |
Further reading
Frequently Asked Questions
What does P0500 mean?
P0500 is the generic SAE J2012 code for "Vehicle Speed Sensor "A"". In plain terms, it means the engine computer has detected a "circuit" fault on the vehicle speed sensor (VSS).
Can I keep driving with P0500?
Drivable with care; shift quality, cruise control and the speedometer may be unreliable.
What should I check first for P0500?
Check whether the speedometer works; if it shares the sensor, that narrows the fault quickly.
Definition source: SAE J2012 / ISO 15031-6 generic DTC definitions. This is the generic meaning that applies across makes; a manufacturer can define a code more narrowly or add its own sub-codes, so confirm against the service information for your vehicle before replacing parts. Written by the OBDAssistant engineering team — see our editorial policy.