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.

A: This may potentially be related to a faulty...

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

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: I keep getting this code preventing me from passing inspection.

When a diagnostic trouble code appears, the code sets to show a fault has been found with a component or along the components circuit. If you only replace the part or parts defined in the code without checking the actual...

Q: 2002 Frontier acceleration issues

On those, I can just about guarantee you that it's a clogged up catalytic converter. It was a design flaw on those vehicles. Have the catalytic converter pressure tested. When they clog up, the gas can't escape the car so...

Q: Failure code of P0723 OSS appeared

Hey there. This relates to a faulty output speed sensor inside your transmission. This is a unit that monitors the output speed of the shaft coming out of the transmission and relays this info to the transmission control module which...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...