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How to Detect Engine Speed Sensor Problems

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How to Detect Engine Speed Sensor Problems
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An engine speed sensor, also known as vehicle speed sensor, retrieves and sends data to your car’s computer system. A car speed sensor shows the car’s engine spinning rate. The vehicle speed sensor does this by taking note of at what rate the crankshaft is spinning. If there are some engine speed sensor problems, it may lead to other difficulties in your car.

Most Common Signs of Engine Speed Sensor Problems

A defective car speed sensor symptoms may cause different problems. The symptoms of a bad transmission speed sensor are same to some other engine problems, like bad throttle position sensor or faulty coil pack. Below is the list of some of the most common signs of a defective engine speed sensor gathered by Car From Japan‘s car bloggers.

1. Harsh or improper shifting

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. Harsh shifting may damage internal components such as valve bodies, hydraulic lines, and even mechanical gears in some cases.

2. Inactive Cruise Control

The speedometer also may work frantically or sometimes stop working altogether
The speedometer also may work frantically

The transmission speed sensor does not only control the input and output shaft speed, meanwhile, it also plays a role in monitoring the cruise control. When there are some engine speed sensor problems, an error code will be sent to the car’s Engine Control Unit (ECU). Then the cruise control will be shut down and does not engage when you press the button. The speedometer also may work frantically or sometimes stop working altogether.

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3. Check Engine Light comes on

Is your Check Engine Light on?
The check engine light comes on sporadically and intermittently when accelerating

If your car has some engine speed sensor problems, the Powertrain Control Module (PCM) will set a diagnostic trouble code and illuminate the Check Engine Light on the vehicle dashboard. Then the check engine light comes on sporadically and intermittently when accelerating. The overdrive light also may go ‘On’ or ‘Off’ for no apparent reason.

How to Look for Problems in the Vehicle Speed Sensor

Check the problems by running a complete computer diagnostic test at a repair shop
Run a complete computer diagnostic test to figure out the problems

If you notice any of the above-mentioned symptoms, you should have your car checked at a nearby auto repair shop. While the problems may be transmission related, run a complete computer diagnostic test at a repair shop, instead of directly taking your car to a specialty shop.

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13 Comments
  1. Muhangi medard says

    Thank you CAR FROM JAPAN for your great lessons, however i have a question for you,do all cars have speed sensors?

  2. Sergio says

    Good replies in return of this query with solid arguments and describing the whole thing about that.

  3. dangal movie collections says

    Thank you for the good writeup. It if truth be told was once
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    However, how could we be in contact?

    1. Trang Tran says

      U can click here to see our fanpage : https://www.facebook.com/CarFromJapan.Official/

  4. Nelson says

    Thanks for the great knowledge. Please help, my car after a cold night, starts well then it starts to behave as if it has a miss even at idle power and at times ot shows the check engine indication, which suddenly disappears. Later on it picks and runs well. What could be the problem?

    1. Trang Tran says

      Thank you for contacting Car From Japan. However, we cannot answer your problem because there is many things we need to see at your car. I suggest you to bring the car to a local mechanical shop o solve your problem.

  5. Elijah Gathii says

    What makes incomplete revs in a modern diesel engine especially Toyota hiace this problem has become disaster to most engineers in Kenya

    1. Trang Tran says

      Thank you for sharing your opinion. Many people will agree with you too.

  6. Dyan says

    An intriguing discussion is definitely worth comment. There’s no
    doubt that that you ought to write more on this topic, it may not
    be a taboo subject but usually people do not discuss such subjects.
    To the next! Many thanks!!

    1. Trang Tran says

      We are happy to receive your comments. Please share with your friends so they can enjoy this article, too.

  7. imunya says

    How does someone know that the idling sensor is defective, signs and symptoms.

  8. Robbie says

    Good way of describing, and good article to get information about my presentation subject matter, which i am going to deliver in college.

    1. Trang Tran says

      We are happy to receive your comments. Please share with your friends so they can enjoy this article, too.

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