The computer sees a missing or wrong signal from the input speed sensor. The driver may notice harsh shifts, late shifts or a stuck gear.
Likely causes, most common first
- Faulty input speed sensor
- Damaged wiring or connector
- Low or dirty transmission fluid
- Metal debris on the sensor
Parts usually involved
- Input speed sensor
- Sensor connector
- Transmission fluid
Test before you replace
Check the fluid level and condition, then read the sensor signal live and test the wiring.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.