Detailed Description of Error P0722
OBDII error code P0722 is a generic trouble code that indicates the Output Speed Sensor Circuit has no signal. This code is triggered when the Powertrain Control Module (PCM) does not receive a valid signal from the output speed sensor, which is responsible for monitoring the transmission output shaft speed.
The output speed sensor is usually located on the transmission output shaft and provides the PCM with information about the transmission output speed. This information is used to control various transmission functions, such as gear shifting, torque converter engagement, and clutch control.
When the PCM does not receive a valid signal from the output speed sensor, it sets the P0722 code and illuminates the Check Engine Light (CEL). This code can be accompanied by other transmission-related codes, such as P0700, P0715, or P0730.
Possible Causes of Error P0722
- Failed or faulty output speed sensor
- Wiring or connector issues between the output speed sensor and the PCM
- Corrosion or water damage to the output speed sensor or its connector
- PCM malfunction or software issue
- Transmission internal failure, such as a broken or worn-out gear
- Low transmission fluid level or dirty transmission fluid
- Incorrect transmission fluid type or viscosity
- Faulty or damaged transmission solenoids or valves
Possible Fixes for Error P0722
- Check the output speed sensor wiring and connector for any signs of damage or corrosion. Repair or replace as necessary.
- Use a scan tool to monitor the output speed sensor signal and verify that it is functioning correctly.
- Check the transmission fluid level and condition. Top off or replace the fluid as needed.
- Inspect the transmission for any signs of internal failure, such as metal shavings or debris in the fluid.
- Replace the output speed sensor if it is faulty or damaged.
- Update the PCM software if necessary.
- Perform a transmission system reset or relearn procedure using a scan tool.
