P0720 Code: Output Speed Sensor Circuit Malfunction
🟠 Moderate severity · drivable
Drivable, but the speedometer may not work and shifting can be erratic. Fix it soon.
What P0720 means
The output speed sensor circuit has a fault, so the computer can't read the transmission's output shaft speed. This reading is also used for the speedometer.
Symptoms
- Check engine light is on
- Speedometer not working
- Harsh or erratic shifting
- Transmission may enter limp mode
Common causes
- most common: Faulty output speed sensor
- common: Damaged wiring or loose connector
- common: Low or dirty transmission fluid
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the output speed sensor | Mechanic | $100–300 |
| Check the transmission fluid level and condition | Yes | $20–60 |
Frequently asked questions
Can I drive with a P0720 code?
Yes, but the speedometer may not work and shifting can be erratic. Fix it soon.
What is the most common cause of P0720?
A faulty output speed sensor.
How much does it cost to fix a P0720?
Typically $100–$300 for a new speed sensor.
Related codes
P0721
P0721 Code: Output Shaft Speed Sensor Circuit Range/Performance
P0722P0722 Code: Output Speed Sensor Circuit No Signal
P0500P0500 Code: Vehicle Speed Sensor (VSS) Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.