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TransmissionSeverity Medium: diagnose soon

P0721Output Speed Sensor Circuit Range/Performance

What it means

The output speed signal is present but implausible.

Symptoms

  • Harsh, late or missing shifts
  • Transmission in limp mode (stuck in one gear)
  • Gearbox or check engine warning light

Common causes

  • Failing sensor
  • Intermittent wiring
  • Damaged tone ring

What to check first

  1. Graph output speed on a road test
  2. Check wiring
  3. Inspect the tone ring
Can I drive with P0721? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0721: questions and answers

What does P0721 mean?

P0721: Output Speed Sensor Circuit Range/Performance. The output speed signal is present but implausible.

What are the symptoms of P0721?

Harsh, late or missing shifts. Transmission in limp mode (stuck in one gear). Gearbox or check engine warning light.

What causes P0721?

Failing sensor. Intermittent wiring. Damaged tone ring.

How do you diagnose P0721?

1. Graph output speed on a road test 2. Check wiring 3. Inspect the tone ring

Can I drive with P0721?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.