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.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Speedometer reads 0
- Limp mode or fixed gear
- Warning lamp (MIL, transmission)
- Cruise control not working
Most likely causes
- Speed sensor faulty (Hall IC or coil open or shorted)
- Connector or harness corroded, chafed or loose pins (with internal sensors also the pass-through connector)
- Metal debris on the sensor magnet or damaged reluctor wheel
- Transmission module or its sensor supply faulty
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P0722 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- 22: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0722?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P0722?
The most common causes are: speed sensor faulty (Hall IC or coil open or shorted); connector or harness corroded, chafed or loose pins (with internal sensors also the pass-through connector); metal debris on the sensor magnet or damaged reluctor wheel.
Related codes
- P0720Output Shaft Speed Sensor Circuit
- P0721Output Shaft Speed Sensor Circuit Range/Performance
- P0723Output Shaft Speed Sensor Circuit Intermittent
- P0717Input/Turbine Shaft Speed Sensor A Circuit No Signal
- P0502Vehicle Speed Sensor A Circuit Low
Sources
- gsi.ext.gm.com: 25OBDG03A
- saabwisonline.com: p0722
- gsi.ext.gm.com: 2006trans7
- newtonnet.co.uk: fordobd2012
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.