Skip the auto shop - Our mechanics make house calls

Q: Speed sensor keeps going bad and Check Engine Light is on.

asked by on

What makes this car speed sensor keep going bad I have changed it 4times car does great until check engine light comes on then it stays in 2nd or 3rd gear

My car has 170000 miles.
My car has an automatic transmission.

This may potentially be related to a faulty transmission control module. As you may know, every time a gear change is required, the car’s computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the correct gear. When this is faulty or not working properly, this can cause a delay in gear shifting or, in some cases, cause the car to not shift at all.

The speed sensors help to monitor the speed of the output shaft in the transmission which then relay this information to the transmission control module. It may be possible that the sensors are now working correctly, but the module is essentially making the signal of the sensor useless. I would recommend having an expert mechanic, such as one from YourMechanic, come to your location to determine why the Check Engine Light is on with the speed sensor and replace the sensor as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Speed sensor keeps going bad and Check Engine Light is on.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine accelerated slow with check engine light on. Light is now off and runs fine

The check engine light is on when the problem was present and vehicle was either in failure mode and reduced power and throttle response. As soon as the intermittent problem went away and systems started working normal the light went...

Q: Honda with bad oil leak. Changed the lead plug and I check the valve cover and didn't see any leaks 2002 Honda Civic

Hi there - it is still possible that the valve cover gasket is leaking into the plug recess, even if it isn't leaking around the outside of the valve cover. Also possible that one of the cam seals is leaking,...

Q: Won't shift out of 2nd gear.

Hi there. The speed sensor wiring could have a fault issue. Check the wiring to the speed sensor and see if there is a 5 volt reference. If there is no voltage, then there may be a break in the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...