P0720 — Output Speed Sensor Circuit Malfunction
Category: Powertrain Severity: Medium
Updated:
DTC code P0720 means: Output Speed Sensor Circuit Malfunction. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include low or degraded transmission fluid, faulty speed sensor or solenoid for the affected gear/shaft and wiring/connector issue; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Low or degraded transmission fluid
- Faulty speed sensor or solenoid for the affected gear/shaft
- Wiring/connector issue
- Internal transmission wear (worn clutch pack or band)
Symptoms
- Harsh, delayed or slipping shifts
- Transmission may enter limp/failsafe mode (stuck in one gear)
- Check engine light on
- Unusual noise when shifting
How to diagnose it step by step
- Check the output speed sensor connector.
- Test the sensor.
- Check the ATF.
- Replace the sensor.
How to fix it
Start by checking the transmission fluid level and condition — many of these codes trace back to low or old fluid. If the fluid is fine, the affected sensor or solenoid is the next suspect; internal mechanical wear is the last, more expensive possibility and usually needs a specialist.
Estimated repair cost
$100–300 installed.
Frequently asked questions
What does DTC code P0720 mean?
Output Speed Sensor Circuit Malfunction.
Is code P0720 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0720?
Carefully; the speedometer may fail.
Related codes
P0717 P0715 P0711 P0710 P0730 P0731 P0732 P0733 P0734 P0735
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