Diagnostic Trouble Code
P0720 — Output Speed Sensor — Circuit Malfunction
Output Speed Sensor — Circuit Malfunction
Definition
The TCM or ECM has detected a malfunction in the transmission output speed sensor circuit. This sensor measures how fast the transmission output shaft is turning, which is critical for shift timing, torque converter lockup, and speedometer accuracy.
Common Causes
- Failed output speed sensor
- Damaged sensor wiring or connector
- Metal debris on the sensor tip from internal transmission wear
- Faulty TCM or ECM