Q: I plugged in a new TPS, now I can't accelerate the engine, and my overdrive and checked engine came on.

asked by on March 11, 2017

I plugged in a new tps, now I cant accelerated, and my over drive and checked engine come on, but the voltage reads how it should. But when i put the old one back on then it all goes back to normal, but with tps codes again.

My car has 200000 miles.
My car has an automatic transmission.

Hi there. Either the wiring to the TPS - throttle position sensors - has a broken or loose contact and is not making the sensor register properly or the sensor that was installed could be the wrong design and causing other functions within the computer to alert the driver.

Check the harness and see if the wiring has any breaks to it and if there is any loose wiring. If the TPS is working properly, then the MAF -mass air flow - sensor could be dirty or damaged causing the TPS to fail.

If you need further assistance with your electrical system, then seek out a professional, such as one from Your Mechanic, to help you.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Burning smell from under the hood
Hello. A lot goes on under the hood and many of the components can reach high temperatures. Any fluid leaks coming into contact with these hot components can burn the fluids and cause an odor. An example would be a...
Master cylinder missing a wire
Hello. The brake light can come on for a number of reasons. If the brake pedal feels fine, then the problem is usually electrical. If the only light that is on is the brake light it is typically caused by...
My belt fell off, and after putting it back on, it is squealing. Do I need to replace the belt?
If the belt came off on its own, then you most likely have a tensioner that is not putting tension on the belt to keep it on. Have the tensioner checked and replaced if it is broken or lacks tension,...
Where is the location of the thermostatic fan switch?
Hi there. The thermostatic fan switch is located under the hood, in the center rear engine area, below valve cover, and is mounted on lower driver side of engine block. The thermostatic fan switch turns on the electric fans when...
Flashing service engine light
If the check engine light starts flashing it can be for many different reasons and all of them can be serious causing the catalyst to get damaged and exceed emission out put from the engine. You could have a misfire...
New starter and battery, damn thing still won't turn over.
Hi there. It sounds like there is either a short to power or feedback occurring in an electrical circuit. Locating the faulty circuit can be time consuming, but it can be accomplished. Look for chaffed/melted wiring and corroded connectors and...
Do the air box need to be change if the screw has been broken
Hi there. In order to help you with your question we need to know what the year, make and model of vehicle you have. In general however, if a screw has been lost, it can easily be replaced with a...
4 Wheel Drive Service Light
Hi There, This is a known problem with many of the Chevrolet trucks and SUV's that is often times related to the 4WD switch becoming faulty and/or some of the wiring being corroded (https://www.yourmechanic.com/services/electric-problems-inspection). I would suggest having a professional...
Car runs fine but will not go over 45mph the check engine light is not on it was fine until I had to change transmission line
Check the fluid level in the transmission as low fluid will cause all kinds of transmission malfunctions. The problem you are describing could be either a transmission issue or an engine issue and sometimes a combination of both. If you...

Related articles

Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
How Long Does a Mass Airflow Sensor Last?
The The right amount of air and fuel in your engine is a vital component in keeping the engine running as it should. Making sure that all of the vital components of the air and fuel system are running at...
How Long Does a Speedometer Sensor Last?
While While a mechanical speedometer will use a speedometer cable attached to the driveshaft and transmission, that’s not the case with an electronic speedometer, such as is used in most modern vehicles. These use a speedometer sensor. It’s mounted to...