P0501: Vehicle Speed Sensor A Range/Performance

What does P0501 mean?

The vehicle-speed signal is implausible for the driving conditions. The speed source may be a transmission sensor or wheel/ABS data depending on the model, so there is not one universal sensor location.

Generic OBD-II definition: Vehicle Speed Sensor A Range/Performance. Confirm applicability in your vehicle service information.

Common causes

• Faulty speed sensor or damaged wiring
• Incorrect tire-size calibration
• Fault in the speed-data source

Symptoms

• Incorrect speedometer
• Abnormal shifting
• Check engine or ABS/traction warnings

Diagnostic focus

A speed sensor replaced at the wrong location will not fix a data-source problem. Read ABS and transmission codes as well as engine codes.

Can I keep driving with P0501?

Severity: High Speed-data faults can affect shifting or driver-assistance functions. Stop if braking, traction control, or vehicle behavior feels unsafe and arrange prompt diagnosis.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Identify the source of vehicle-speed data
• Check tire size and applicable calibration
• Compare wheel/vehicle speeds and inspect sensor wiring

Sources & review

• OBD-Codes.com: P0501
• TroubleCodes.net: generic code definitions

Definitions and diagnostic background checked 2026-11-06. Generic guidance, not a substitute for the service procedure for your exact year, engine, and transmission.