P2581Turbocharger/Supercharger Speed Sensor A Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2581 is set when speed sensor A reports a level above what a healthy circuit can produce, so the engine computer cannot trust it. Typical triggers are a signal wire shorted to the supply or battery voltage, an open signal or ground path that lets the input float high, or a sensor with a shorted output stage. No manufacturer documents P2581 publicly; the closest evidence is Bentley's W12 bulletin, which lists the B-sensor high fault P2596 and demands checks for shorts to B+ before the sensor is replaced, and CARB's rule that electronic boost-control parts be monitored as comprehensive components. P2580 is the low-side fault, P2582 brief dropouts. The engine usually trims boost and lights the warning lamp.
- What you may notice
- Malfunction indicator lamp on
- Implausibly high or fixed turbo speed in live data
- Reduced boost and power
- Likely causes
- LikelySignal wire shorted to supply or battery voltage
- PossibleOpen ground or signal wire letting the input float high
- PossibleSpeed sensor A with a shorted output
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.