Vehicle Speed Sensor A Malfunction
The controller did not receive valid vehicle-speed information from the designated A signal source. Depending on the vehicle, speed may come from a transmission sensor, an ABS module or network data. P0500 does not identify a particular wheel sensor as failed. Because speed information supports powertrain and control functions, other warnings and driving behavior matter when assessing urgency.
Can I keep driving?
An inoperative speedometer, unpredictable shifting, changed braking or additional safety warnings calls for a safe stop and towing. With a steady light and normal operation, get vehicle-specific shop guidance before further driving.
Flashing light, burning smell or smoke? Pull over safely. Danger to life: call 911.
What does this code mean for your car?
The same code can need different checks depending on the model and engine. Enter your vehicle details to find relevant sources and checks.
Symptoms
- Erratic or inoperative speedometer
- Abnormal shifting on some vehicles
- Engine warning and possible ABS or stability warnings
Possible causes
- 1Faulty speed sensor or signal source
- 2Damaged wiring or connector
- 3Damaged target ring or sensing component
- 4Network or another module's speed-data fault
These possibilities are not ranked by frequency and do not diagnose your vehicle.
Checks you can safely do yourself
Safe checks only: engine off and cold, car on level ground.
- Save the code and freeze-frame data if your scanner offers them, without clearing anything.
- Record warnings and speedometer behavior already observed; do not drive to test whether the speedometer fails.
When you need a shop
If speed cannot be determined, shifting is unpredictable or braking changes, stop and arrange towing. Request a full-module scan and identification of the actual speed source before sensor and wiring tests.
How much does it cost?
A US repair estimate needs a diagnosis and a local shop quote.
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.
Get 2-3 quotes
Investigate this code for my carFAQ
Can I keep driving with P0500?
An inoperative speedometer, unpredictable shifting, changed braking or additional safety warnings calls for a safe stop and towing. With a steady light and normal operation, get vehicle-specific shop guidance before further driving.
What can cause P0500?
Possible causes include faulty speed sensor or signal source; damaged wiring or connector; damaged target ring or sensing component; network or another module's speed-data fault. These are diagnostic possibilities, not a confirmed diagnosis or a parts shopping list.
Does clearing the code fix the problem?
No. Clearing a code does not repair the problem or prove that no fault exists. It may erase useful evidence and reset readiness monitors. Save codes and freeze-frame data first; confirming a repair requires the vehicle-specific checks.
What if this code appears during a used-car inspection?
Arrange an independent professional pre-purchase inspection before committing. Request a complete scan, readiness status and diagnosis of the relevant system. Get written findings and a repair estimate; an unlit warning lamp does not replace inspection.
How much does a P0500 repair cost?
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.