Symptoms of a Bad or Failing Transmission Position Sensor (Switch)

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The transmission position sensor, also known as the transmission range sensor, is an electronic sensor that provides a position input to the Powertrain Control Module (PCM) so that the transmission can be properly controlled by the PCM according to the position commanded by the sensor.

Over time, the transmission range sensor may begin to fail or wear out. If the transmission range sensor fails or suffers a malfunction, there are a number of symptoms that could appear.

1. Car does not start or cannot move

Without a proper Park/Neutral position input from the transmission range sensor, the PCM will not be able to crank the engine over for starting. This will leave your car in a situation where it cannot be started. In addition, if the transmission range sensor has completely failed, the PCM will not see any gear command input at all. This means that your vehicle will not be able to move at all.

2. Transmission goes into different gear than selected

There could potentially be a mismatch between the gear selector lever and the sensor input signal. This would cause the transmission to be in a different gear (controlled by the PCM) than the one selected by the driver using the shift lever. This could lead to unsafe operation of the vehicle and could likely become a traffic hazard.

2. Vehicle goes into limp mode

On some vehicles, if the transmission range sensor fails, the transmission can still be mechanically placed into gear, but the PCM will not know which gear that is. The transmission will be hydraulically and mechanically locked into one specific gear for safety, a situation known as limp mode. Depending on the manufacturer and the particular transmission, limp mode could be 2rd, 4th, or 5th gear, as well as Reverse.

Any of these symptoms necessitate a visit to the shop. However, instead of taking your vehicle to a mechanic, the technicians at YourMechanic come to you. They can diagnose whether your transmission range sensor is bad and replace it if necessary. If it turns out to be something else, they’ll let you know and diagnose the issue with your car so it can be repaired at your convenience.


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Recent Check Transmission System reviews

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YourMechanic Check Transmission System Service

Average Rating

4.8/5

Number of Reviews

6

Rating Summary
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Chet

39 years of experience
439 reviews
Chet
39 years of experience
Mercedes-Benz ML320 - Check Transmission System - Chula Vista, California
Professional, timely and quite knowledgeable. Knowing a trustworthy mechanic who knows what he's doing is as important as knowing a good doctor or dentist, etc. I found this in Chet. I will definitely use this service again and request him as my your mechanic mechanic once I order the part or decide my next course of action. I now have peace of mind about my Mercedes ml320. Thanks Chet!
Dodge Ram 1500 - Check Transmission System - Chula Vista, California
Very knowledgeable and professional mechanic.

Diego

19 years of experience
419 reviews
Diego
19 years of experience
Chevrolet Equinox - Check Engine Light is on - Phoenix, Arizona
he arrived early to my home and started out by doing an inspection of my vehicle he explained how the procedures he checked to see if everything was ok he went through wiring diagrams to check the wiring on my egr valve. he was proffesional about his identifying the check engine light your mechanic is convenient and I would most likely reccomend to anyone.
Ford Explorer Sport Trac - Oil/Fluid Leak - Avondale, Arizona
He is very nice, I feel I can trust him. He looks you in the eye and explains everything completely. I'm happy with him as my mechanic

Jose

13 years of experience
249 reviews
Jose
13 years of experience
Toyota Tacoma - Check Transmission System - Gibsonton, Florida
Showed up on time. Jose was thorough and explained everything to me in detail. He fixed the issue and also fixed another issue I threw at him at the last minute. Very professional and friendly service. I'll definitely be using him again and recommending him to anyone that needs a mechanic.

Dustin

11 years of experience
41 reviews
Dustin
11 years of experience
Audi TT - Check Transmission System - Katy, Texas
Yourmechanic seems to find the best/knowledgeable mechanics who actually care about their customers and what they do. Dustin was able to re-set my car's transmission cables/rods in order for it to drive correctly again (scary not being able to reach 5th gear and higher speeds when you need to). Impressive also is the fact he was only there to check the system and assess the problem(s). He took the time to inform me of the possible necessary work that my car's transmission system may need and I feel more confident in dealing with the issues/concerns when they eventually do come up. I will always consider making an appointment with you guys before any shops and of course before contacting any dealership shops. Now I have two trusted mechanics from your crew to bug!

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