P0501: Vehicle Speed Sensor A Circuit Range/Performance

The vehicle speed signal A comes, depending on the maker, from a sensor on the gearbox, the transmission output speed, the wheel speeds via ABS/ESP or a CAN message; CARB explicitly names it as an input to be monitored. P0501 means the signal is present but does not fit the driving state or lies outside the physically possible range. Saab's Trionic T5 sets it above 270 km/h; other makers typically compare it with engine speed times gear ratio, wheel speeds or the transmission output speed. GM's 2018 tables and Ford do not use P0501 (GM: P0503, Ford: P0500). Cruise control is then disabled.

Symptoms

• Check engine light on
• Speedometer dead or jumping
• Cruise control not working
• Automatic shifts harshly or wrongly

Most likely causes

• Wheel speed sensor or tone ring damaged or dirty (ABS source)
• Wrong tyre size, axle ratio or coding
• Sensor with weak signal or damaged tone wheel
• Interference from damaged shielding or ground

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the speed in live data while someone else drives
2. Compare the reading with other engine data while varying the engine speed.
3. Inspect the connector and wiring
4. Read the ABS codes as well
5. Replace the sensor if there is no signal

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P0501 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 5: Speed and idle
• 01: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0501?

Drive with caution: the speedometer may be wrong and driver assistance features may fail.

What causes code P0501?

The most common causes are: wheel speed sensor or tone ring damaged or dirty (ABS source); wrong tyre size, axle ratio or coding; sensor with weak signal or damaged tone wheel.

Related codes

• P0500Vehicle Speed Sensor A Circuit
• P0502Vehicle Speed Sensor A Circuit Low
• P0503Vehicle Speed Sensor A Circuit Intermittent/Erratic/High
• P0720Output Shaft Speed Sensor Circuit
• P0721Output Shaft Speed Sensor Circuit Range/Performance

Sources

• saabwisonline.com: p0500p0501 p0502
• saabwisonline.com: p0500 p0501 p0503
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.