Check Engine Code
P0720
Output Speed Sensor Circuit Malfunction
Severity: medium
DIY difficulty: 3/5
Typical cost: $80–$400
What P0720 means
The output shaft speed sensor tells the TCM how fast the transmission output is spinning. Without a good signal, shift quality goes to pieces.
Symptoms
- CEL
- Erratic shifting
- Speedometer may read incorrectly
- Harsh engagement
Likely causes (most common first)
- Failed output speed sensor
- Damaged wiring
- Metal debris stuck to the sensor tip
- Low transmission fluid
Can I keep driving?
Medium — drivable but fix soon
Typical repair cost
DIY fixes can start near $80 (parts only). Shop repairs for P0720 typically run up to $400 depending on the underlying cause and vehicle. Start with the most common cause — Failed output speed sensor — before throwing parts at it.
Related codes
Confirm P0720 yourself in 60 seconds
AXLY.pro is a free iPhone app that pairs with any Bluetooth OBD2 adapter to read P0720 and every other stored code, plus live engine data. No subscription.