Detailed Description of Error P0720
The OBDII error code P0720 is a generic trouble code that indicates a problem with the Output Speed Sensor Circuit. This sensor is responsible for monitoring the output shaft speed of the transmission and sending the information to the Powertrain Control Module (PCM). The PCM uses this data to control the transmission''s gear shifts, torque converter engagement, and other functions.
The Output Speed Sensor is usually located on the transmission''s output shaft or on the transmission case. It''s a critical component of the transmission control system, and any malfunction can cause problems with the transmission''s operation.
When the PCM detects an issue with the Output Speed Sensor Circuit, it will set the P0720 code and illuminate the Check Engine Light. This code can be triggered by a variety of problems, including a faulty sensor, wiring issues, or internal transmission problems.
Possible Causes of Error P0720
- Faulty Output Speed Sensor
- Wiring issues or damage to the sensor circuit
- Corrosion or water damage to the sensor or connector
- Internal transmission problems, such as worn or damaged gears or bearings
- Low transmission fluid level or dirty fluid
- PCM or transmission control module malfunction
- Incorrect transmission fluid type or viscosity
- Transmission solenoid malfunction
Possible Fixes for Error P0720
- Scan the transmission control module for any stored trouble codes and freeze frame data to help diagnose the problem
- Check the transmission fluid level and condition, and top it off or replace it as needed
- Inspect the Output Speed Sensor and its wiring for signs of damage or corrosion
- Use a multimeter to test the sensor''s voltage and resistance
- Replace the Output Speed Sensor if it''s faulty
- Repair or replace any damaged wiring or connectors
- Check the transmission''s internal components for signs of wear or damage
- Consult a professional mechanic or transmission specialist if the problem persists
