Powertrain
generic / SAE
P0720
Output Speed Sensor Circuit Malfunction
The transmission output speed sensor signal is missing or implausible. The TCM uses this signal together with input speed to determine actual gear ratio; many vehicles also use it as a backup vehicle speed signal for the cluster and ECU.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 20
Possible causes
- Output speed sensor failed high
- Wiring or connector fault medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–900 €
- Estimated time: 1.5–6 h
- Component: transmission output speed sensor
- Component: transmission output speed sensor wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012