P0500 Vehicle Speed Sensor A Circuit

Investigate soon

The ECU has logged a fault on P0500. The definition below is the exact wording the standard uses for this code.

Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.

The definition

P0500: Vehicle Speed Sensor A Circuit.

P0500 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.

What to check first

Cheapest and fastest checks first:

Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
Check the connector at the part for corrosion, and that it is fully seated.
Clear the code and see whether it returns, and under what conditions.

What actually causes this on a VAG

Your car's road speed has to come from somewhere, and on most modern Audis, VWs, Skodas and SEATs there is no dedicated vehicle speed sensor feeding the engine ECU - the ABS/brake controller works speed out from the four wheel speed sensors and sends it round the car on the data network. So P0500 usually means the engine ECU stopped receiving a valid speed signal, rather than a part called "the speed sensor" having died. On older models there genuinely is a single speedometer sender screwed into the gearbox, and that can fail on its own. A useful first clue is the speedometer needle: if it still reads correctly, a usable speed signal is being produced and sent out, so the problem is more likely to be in the path to the engine ECU. Take note of any ABS, traction control or ESP warning lights on at the same time - if those systems have shut down, braking and stability assistance are reduced, so this wants sorting promptly rather than at your leisure.

Most likely causes, in order

A wheel speed sensor, or the ABS controller itself. One faulty wheel speed sensor, or a fault inside the ABS controller, can stop it broadcasting a valid speed, and the engine ECU logs P0500 as a knock-on effect. Scan every module rather than just the engine - the fault that actually needs fixing is usually stored in the ABS controller, often with an ABS or traction control light on as well. An individual wheel speed sensor is a modest part; the controller is not, so prove which one it is before anything gets ordered.
Wiring or a connector in the signal path. Wheel speed sensor cables flex with the suspension and live in road spray, and the loom around the gearbox sits in heat and salt. Look for chafed insulation, green corrosion inside plugs, and anything disturbed by recent work in that area.
The gearbox speedometer sender (older models). On models that still have a sender in the gearbox, the sender, its plug or its drive can wear out, and the giveaway is a speedometer that's dead or wildly erratic. It's usually a fairly cheap and accessible part.
Instrument cluster or network fault. On some models the cluster sits in the chain that passes the speed signal on, so a cluster or bus problem can break it with every sensor perfectly healthy. Suspect this when several unrelated modules are also reporting missing or implausible messages.

Worth knowing: Don't let anyone sell you "a speed sensor" before the whole car has been scanned - on many of these cars there isn't one to replace, and the fault that actually needs fixing is sitting in the ABS system. If ABS, traction control or ESP lights are on alongside it, treat that as the priority: those are safety systems and they may be switched off while this fault is present.

Reading the code is the easy part

A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.

VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.

$249 once. No subscription, unlimited cars. Windows 10/11.

See VAGPULSE — $249 Look up another code

Software downloads instantly · cable ships September 30 · cable guarantee — refund if it won't connect

Prefer to work on your phone? The VAGPULSE Android app is a free download and its demo mode runs against a sample car with no hardware at all, so you can see exactly what it reads before spending anything. Reading your car with it needs the VAGPULSE cable, which comes with the licence.

Common questions

What does P0500 mean?

P0500 means Vehicle Speed Sensor A Circuit. It is logged when the ECU sees this circuit outside its expected operating window.

Can I drive with P0500?

The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.