10 Faqs On The Output Speed Sensor Of Your Car

Output Speed Sensor

What is the function of the output speed sensor?

The output speed sensor measures the speed at which a vehicle is moving and transmits that information to other vehicle systems as required by the vehicle. The transmission control unit uses the vehicle’s speed to calculate when to shift into higher or lower gears, to modify the torque converter, and to display the vehicle’s current speed on the speedometer display.

What happens if the output speed sensor malfunctions?

The abnormal operation of the automatic transmission is one of the most common symptoms of a bad speed sensor. If the VSS is faulty, the transmission may exhibit symptoms such as delayed shifts, difficult shifts, and gear selection limitations.

Typical Signs and Symptoms of Malfunction Output Speed Sensor

This code, like the majority of others, causes the Check Engine light to illuminate. Other common signs and symptoms are as follows:

  • Transmission is unable to shift properly or shifts in a haphazard manner.
  • Symptoms resembling a misfire
  • “Limp mode” is activated on the engine.
  • Speedometer readings that either incorrect or unpredictable

Possible Cause of Output Speed Sensor Malfunction

  • OSS that is faulty
  • Transmission filter that is blocked or dirty
  • Transmission fluid that is dirty or polluted.
  • Temperature sensor for coolant that is not working correctly
  • Hydraulic channels clogged or restricted
  • a transmission valve body that is not functioning properly
  • connection that has corroded or become damaged
  • Wiring that is faulty
  • PCM that is faulty (rare)

Will a faulty output speed sensor prevent a vehicle from shifting?

The PCM will be unable to control the shifting of gears within the transmission unless these sensors provide a valid speed signal. A problem with these sensors can also affect shift timing, extending the interval between transmission shifts.

What is the difference between input and output speed sensor?

Typically, two sensors transmit transmission data to the powertrain control module of the vehicle. The first sensor, referred to as the input sensor, is used to monitor the input shaft speed of the transmission. The second sensor is an output sensor, which measures the speed of the output shaft.

What is the root cause of output speed sensor failure?

It is possible for the transmission speed sensor to become faulty over time as a result of wiring issues or to completely fail as a result of it being used constantly every time you drive your vehicle. It is possible for a magnetic sensor to become faulty as a result of iron adhering to the tip of the sensor, which will result in an inaccurate reading.

How long the lifespan of output speed sensors?

anywhere between 30,000 and 50,000 miles.

There is no hard and fast rule that can help you predict how long your wheel speed sensor will last. Unlike a brake light switch or caliper, which can last as long as your vehicle, your transmission speed sensor should last between 30,000 and 50,000 miles.

Where is the output speed sensor.

A longitudinal mount transmission’s transmission speed sensor is positioned in the back. The speed sensor is situated on the long side of the output shaft in transaxles. This is the end of the transaxle that faces the engine’s front.

output speed sensor location

4 DTC OBD Code Related to Output Speed Sensor

P0723 Output Speed Sensor Intermittent

P0723 is an OBD-II code that indicates that the transmission’s output speed sensor (OSS) is producing an inconsistent, irregular, or otherwise aberrant signal…. The proper operation of the OSS is critical because if the signal is erroneous, the transmission will not be able to shift in the proper direction.

P0722 Output Speed Sensor No Signal

When the PCM receives an inaccurate or unreasonable input signal from the transmission’s output speed sensor, a P0722 code is recorded in the memory. The transmission cannot produce an effective shifting strategy when the signal is erroneous, intermittent, or inaccurate because it does not have proper information about the speed of the vehicle.

P0721 Output Speed Sensor Range/Performance

Output Speed Sensor Range/Performance is the definition of Error Code P0721. In order to provide information about the rotational speed of the transmission output shaft to the PCM, the Transmission Output Speed Sensor must send a signal to the PCM. These readings are used by the PCM to regulate the shift solenoids.

The OSS (output shaft speed sensor) is located at the end of the output shaft on cars with electronically controlled gearboxes. P0721 is a trouble code that is generated when the PCM/ECM (powertrain control module/engine control module) determines that the OSS sensor is not operating properly.

P0720 Output Speed Sensor Circuit Malfunction

The P0720 trouble code is a typical OBD-II trouble code that indicates that there is a problem with the output speed sensor circuit. The P0720 error code will be triggered if the PCM fails to receive information from the output speed sensor, or if the information received is irregular, unpredictable, or simply does not show a slow and steady increase over time.


This tutorial was compiled and researched by Erwin Salarda