P0500: Vehicle Speed Sensor "A"
The vehicle speed signal is missing or implausible.
Normal risk
Drivable with care, but shifting, cruise control and the speedometer may not work normally.
Short answer · Can I keep driving with P0500?
With care. The speedometer may not work, cruise control is disabled and an automatic gearbox may shift harshly. Have it checked soon.
What does P0500 mean?
Code P0500 means the engine control unit is not getting a valid vehicle speed signal. On many modern cars this signal comes from the wheel speed sensors through the ABS module, so ABS codes are worth checking too.
What the car does when the code is set
The check engine light comes on. The speedometer may stop working, cruise control is usually disabled and an automatic gearbox may shift harshly or stay in a fixed gear. ABS or stability warnings may also appear.
How the system works
The vehicle speed signal comes from a sensor on the gearbox or, on most modern cars, from the wheel speed sensors through the ABS module. The engine and gearbox control units, speedometer, cruise control and other systems use it. Code P0500 means the signal is missing, implausible or does not match what other inputs suggest.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Faulty speed sensorThe sensor can fail or be damaged by dirt and metal particles.
- Wiring or connector faultDamaged, corroded or loose wiring interrupts the speed signal.
- Damaged sensor ring or driveA cracked or dirty tone ring or a worn drive gear gives no or irregular signals.
- ABS module or network faultOn many cars the vehicle speed comes from the ABS system over the network.
- Instrument cluster faultLess common, but some cars route the speed signal through the cluster.
How it is diagnosed
- Check the speedometerA speedometer that does not work or jumps points to the speed signal itself.
- Read codes from all modulesABS or wheel speed codes often show where the problem starts.
- Inspect the sensor and wiringLook for damage, dirt and loose connectors at the sensor.
- Check the signal with a scan toolA workshop compares the vehicle speed signal with wheel speeds while driving.Do not test-drive with faulty speed signals on busy roads; cruise control, gear shifts and ABS may not work normally.
Questions about P0500
Is it safe to drive without a speedometer?
You cannot check your speed, which is a legal risk. Drive carefully and have it fixed soon.
Why does my automatic shift badly with this code?
The gearbox uses vehicle speed to choose shift points. Without a valid signal it may shift harshly or stay in one gear.