What is code P0721?
OBD-II Code P0721 is defined as a Output Speed Sensor Circuit Range/Performance. The Output Speed Sensor tells the Transmission Control Module (TCM) how fast the output shaft of the transmission is spinning so it can verify the correct gear is engaged.
What is a transmission input speed sensor?
Transmission speed sensors are used to calculate the actual gear ratio of the transmission while in use. The first is known as the input shaft speed (ISS) sensor. As described, this sensor is used to monitor the speed of the transmission’ input shaft. The other sensor is the output shaft speed (OSS) sensor.
How do I fix code P0721?
What repairs can fix the P0721 code?
- Removing the OSS sensor and inspecting its condition, especially its teeth and the sensor’s resistance.
- Inspecting the wiring harness for loose connections or wires that have been damaged.
- Checking the power that goes into the OSS sensor as well as the PCM harness.
What does the p0721 code on a transmission mean?
The P0721 code is a sign that the TCM (transmission control module) isn’t properly converting incoming pulse signals. What the P0721 code means On vehicles with electronically-controlled transmissions, the OSS (output shaft speed sensor) is positioned at the end of the output shaft.
What is the transmission output speed sensor code?
Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration. The P0721 OBD-II trouble code is associated with the Transmission Output Speed Sensor.
What are the symptoms of a bad shaft speed sensor?
Typical symptoms for a bad sensor include harsh and improper shifting, check engine light on dash and the cruise control may be inoperative. ► P0721 – Output Shaft speed sensor or countershaft speed sensor circuit range / performance error.
What should I look for in an output speed sensor?
Check the connectors and connections for security, corrosion and damaged pins. This should include all wiring and connectors to the output speed sensor, transmission solenoids, transmission pump and the PCM. Depending on the configuration, the transmission linkage should be inspected for security and freedom of movement.