OBD-II · Engine and powertrain (P)
P0720
Output shaft speed sensor circuit
What it means
The signal from the gearbox output shaft speed sensor is missing or invalid.
Symptoms
- gearbox warning light or engine warning light
- harsh, delayed or no gear changes
- limp mode, stuck in one gear
- speedometer may be wrong on some cars
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | failed output speed sensor |
| 02 | wiring or connector fault |
| 03 | fluid leaking into the connector |
| 04 | debris on the sensor |
What to check, step by step
- 01Read all transmission and ABS codes
- 02Inspect the sensor connector and wiring
- 03Compare output speed with vehicle speed in live data
- 04Replace the sensor if the wiring is good