Asked by: Edilberta Cepas
automotive auto safety technologies

What is the purpose of a speed sensor?

Last Updated: 22nd March, 2020

Vehicle Speed Sensors
The vehicle speed sensor (VSS) measures transmission/transaxle output or wheel speed. The ECM uses this information to modify engine functions such as ignition timing, air/fuel ratio, transmission shift points, and to initiate diagnostic routines.

Click to see full answer.

Similarly, it is asked, what happens when a speed sensor goes bad?

When there are symptoms of a bad transmission speed sensor, the powertrain control module cannot control the shifting of gears within the transmission properly. This may cause transmission revs higher before shifting gear or leading late transmission overdrive and inability to go into that top gear.

Secondly, what is the work of speed sensor? The output shaft speed sensor detects the speed of the drive wheels and sends this information back to the engine control unit. Together these two shafts allow the wheels to rotate at a speed that is manageable while the engine continues to run at a speed that makes it perform efficiently.

Beside this, what are the symptoms of a bad speed sensor?

Here are the symptoms of a bad or failing transmission speed sensor

  • Harsh or improper shifting. Without a valid speed signal from these sensors, the PCM will not be able to correctly control the shifting of gears within the transmission.
  • Cruise control does not work.
  • Check Engine Light comes on.

Can I drive my car with a bad speed sensor?

That is why in general, it is unsafe to drive a vehicle with a broken wheel speed sensor. If the wheel speed sensor becomes damaged or wears out, initially you probably won't notice much difference in the way your car performs if your ABS light comes on unless you are driving on slippery pavement.

Related Question Answers

Darby Garrancho


Where is a speed sensor located?

The Speedometer Vehicle Speed Sensor (VSS) is located in the transmission housing on the passenger side output flange. The Speedometer Vehicle Speed Sensor (VSS) is located in the transmission housing on the passenger side output flange.

Idilia Jouan


How do you fix a speed sensor?

How to Repair a Vehicle Speed Sensor
  1. Park the vehicle on a level surface. Engage the emergency brake and turn the engine off.
  2. Place a vehicle jack on the left side and right side of the automobile.
  3. Look straight up on the passenger side of the vehicle.
  4. Unplug the electrical wire.
  5. Align the replacement speed sensor into the transmission.

Vallivana Lisart


How do you test a speed sensor?

Vehicle Speed Sensor Testing
  1. Turn the ignition switch to the OFF position.
  2. Disengage the wiring harness connector from the VSS.
  3. Using a Digital Volt-Ohmmeter (DVOM), measure the resistance (ohmmeter function) between the sensor terminals. If the resistance is 190–250 ohms, the sensor is okay.

Stelica Hajkasimov


Where is the transmission input speed sensor?

Note: The transmission speed sensor is located in the rear of a longitudinal mount transmission. For transaxles, the speed sensor is located on the long side of the output shaft. This would be the end of the transaxle that faces the front of the engine.

Rommel Baamonde


How much does it cost to replace a speed sensor?

Depending on the vehicle year, make and model, a speed sensor can cost as little as $7.92 or as much as $100. For most vehicles, the cost for a speed sensor is between $25 and $45. Follow these procedures for replacing a faulty vehicle speed sensor (VSS).

Jakes Hormann


Can a bad speed sensor cause transmission problems?

Even in a manual vehicle, a bad transmission speed sensor can cause gear shifting problems. Just moving the stick can be more difficult, and you may notice that the shaft feels rougher, or faster than usual when you shift.

Sekhou Arroz


Can a sensor cause transmission problems?

Manifold Airflow Sensor
If it fails it can cause automatic transmission problems such as late harsh shifts, early soft shifts, or can result in no shifting at all. The mass airflow sensor is directly related to engine performance, so an issue may affect the drivability of the vehicle and a poor running engine.

Kheira Althofer


How do you clean a speed sensor?

How to Clean the Speed Sensor on a Vehicle
  1. Prepare the area by gathering all materials and placing them within reach.
  2. Lift up the front of the car, and place it on the jack stands.
  3. Locate the sensor, and decide whether it is an open or disguised sensor.
  4. Take the wrench, and unfasten the sensor.
  5. Spray the rag with degreaser.

Alvera Templar


What does a speed sensor affect?

There is the engine speed sensor and the transmission speed sensor. The engine speed sensor detects how many revolutions per minute (RPM) your engine's crankshaft is spinning in real time. The transmission speed sensor detects how fast your car is traveling on the road.

Armenio Jabon


Does the speed sensor affect the odometer?

Primarily, the wheel speed sensors from the ABS system are used along with a vehicle speed sensor. Some cars also have a transmission output shaft speed sensor. This is important because the error that causes the speedometer not to work may not affect the mileage. In my experience, it usually does not.

Oleg Sambade


How do you know if your transmission control module is bad?

Some of the most common signs of a bad transmission control module include: You have difficulty downshifting when you're slowing down, coming to a stop, or manually trying to downshift. Your transmission shifts to neutral or to another gear on its own.

D'Arc Lapeña


Which speed sensor controls speedometer?

A vehicle speed sensor (VSS), also known as an output speed sensor (OSS), is what tells your vehicle's control unit how fast the vehicle is going. Your vehicle's speedometer and odometer rely on the information from this sensor.

Cyndy Matas


How many speed sensors does a car have?

There are generally two speed sensors that work in conjunction to provide accurate transmission data to the vehicle's powertrain control module.