P0721: Output Speed Sensor Circuit Range/Performance
MediumPowertrainTransmission
What does P0721 mean?
P0721 is a diagnostic trouble code indicating "Output Speed Sensor Circuit Range/Performance". The sensor or component is providing readings, but they fall outside the expected operating range. The part may be degraded, contaminated, or experiencing intermittent issues affecting transmission performance.
Common causes
- Worn or contaminated transmission component
- Vacuum leak or intake air leak
- Clogged filter or restricted flow
- Intermittent electrical connection issue
What should you do?
Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.
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Code P0721 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.