P0720 on Toyota Corolla E170: Output Speed Sensor Circuit Malfunction
Short answer: P0720 means “Output Speed Sensor Circuit Malfunction”. The car’s computer has found a fault in the AT (gearbox) system and turns on the Check engine light (MIL). First check: read the code with a scanner that can read the gearbox computer.
Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.
- Code
- P0720
- System
- AT (gearbox)
- Dashboard light
- Check engine light (MIL)
- Applies to
- Generic OBD-II meaning. Not every code is used by this car.
- Confidence
- medium (generic OBD-II definition, not checked against the factory manual for this car)
- Source
- obd-codes.com
Symptoms and when it is set
- Check engine light on
- Delayed shifts
- Speedometer not working
Likely causes
- Output shaft speed sensor
- Electrical wiring or connections
- Transmission fluid temperature sensor
- Diagnostic / Repair Steps 5.- The OSS sensor operates by passing an electrical current through the sensor, as the reluctor ring or gear on the end of the transmission output…
- If the resistance is out of range or over limit (OL), replace the sensor. Check for power going into the sensor, and at the PCM harness connector…
What to check, in order
- Read the code with a scanner that can read the gearbox computer
- Check the gearbox fluid level and condition with the correct procedure
- Check the connector and wiring at the gearbox
- Have a gearbox specialist confirm before replacing parts
Related on this car
Same code on other cars
- P0720 · Toyota Passo (1st gen)
- P0720 · Toyota Corolla (10th gen, E140)
- P0720 · Honda City (5th gen, GM2)
- P0720 · Honda Civic (10th gen, FC)
- P0720 · Suzuki Wagon R (Pakistan, K10B)
- P0720 on all cars compared
Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.