P0722Output Shaft Speed Sensor Circuit No Signal
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The output shaft speed sensor (Hall or inductive) reports the speed of the transmission output; it gives the gear ratio together with input speed and on many vehicles also the road speed for speedometer and cruise control. P0722 means the output speed signal is missing while the vehicle is driving. GM's 2025 modules flag under 60 rpm for 3.5–5 s with more than 50 Nm torque and check wheel speeds as well; a 2006 GM table flags no output pulse during 6000 input pulses; Ford under 100–200 rpm for 5–30 s; Saab's Aisin box from 4 km/h. GM rates it after one trip. The transmission goes into limp mode, and speedometer and cruise control may stop working. On GM's 10-speed, P0717 and P0722 together point to the shared sensor supply.
- What you may notice
- Speedometer reads 0
- Limp mode or fixed gear
- Warning lamp (MIL, transmission)
- Cruise control not working
- Likely causes
- LikelySpeed sensor faulty (Hall IC or coil open or shorted)
- LikelyConnector or harness corroded, chafed or loose pins (with internal sensors also the pass-through connector)
- PossibleMetal debris on the sensor magnet or damaged reluctor wheel
- RareTransmission module or its sensor supply faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.