P0722 code meaning
Output Shaft Speed Sensor Circuit No Signal
Powertrain system Generic code P07xx codes Check engine light
What P0722 means
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.
P0722 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0722
- Speedometer reads 0
- Limp mode or fixed gear
- Warning lamp (MIL, transmission)
- Cruise control not working
Common causes of P0722
- Most likelySpeed sensor faulty (Hall IC or coil open or shorted)
- Most 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
- Less likelyTransmission module or its sensor supply faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Output speed sensorSensor wiringTransmission control module
What each part of P0722 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| 22 | The exact fault in that area. |
What to do next
- Note P0722 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0722
What does P0722 mean?
P0722 means "Output Shaft Speed Sensor Circuit No Signal". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0722?
Drive gently and only to a workshop. With P0722 the car can go into limp mode (reduced power) to protect itself.
Will P0722 fail an emissions test?
Yes, it can. P0722 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0722 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0722 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.