Powertrain
generic / SAE
P0721
Output Speed Sensor Circuit Range/Performance
The transmission output speed sensor signal is implausible compared to vehicle speed and gear ratio. Sometimes set together with VSS or input-speed-sensor codes.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 21
Possible causes
- Output speed sensor failed high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
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: medium
- DIY: shop recommended
- Estimated cost: 150–800 €
- Estimated time: 1–4 h
- Component: transmission output speed sensor
- Component: sensor wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012