Powertrain, generic · Transmission

P0722 Output Shaft Speed Sensor Circuit No Signal

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

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

Symptoms

  • Speedometer reads 0
  • Limp mode or fixed gear
  • Warning lamp (MIL, transmission)
  • Cruise control not working

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–450
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

output speed sensorsensor wiringtransmission control module

Related codes

P0720P0721P0723P0717P0502

References: gsi.ext.gm.com, saabwisonline.com, gsi.ext.gm.com, newtonnet.co.uk.