Q: Throttle position sensor light on

asked by on

Last week the check engine light came on so I looked and it said "throttle position sensor" P0120. I proceeded to replace it but that did not fix the problem. I continued to replace the ECM and the problem was solved. However, the transmission is now shifting very hard. This started when the TPS went bad. What should I do to fix it?

For many vehicles, regardless of manufacturer, there is the need to do a "re-learn" sequence (after replacing the TPS or a battery) so the TPS and transmission will work smoothly. You may have to drive the vehicle for a bit in order this re-learning procedure to complete. If you are still having problems after a couple of weeks, I recommend having a professional mechanic inspect the shifting issue and check the TPS and transmission for proper operation.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Throttle position sensor light 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: I need the ecm/pcm replaced do you guys come out and do that?

YourMechanic can replace the ECM/PCM on your vehicle if a diagnostic has determined that it has failed. However, please note that PCM's rarely are the cause of a no start condition and thus all other potential causes should be investigated...

Q: Transmission rebuild cost

I just did a quick E-bay search and found this: (06-10 Chevy Impala 3.5L 4T65E w/ Converter, Remanufactured 3 year 100,000 mile Warr, Free Converter, NO CORE CHARGE) for a $1,475.00 plus a $300.00 shipping charge. Then there would be...

Q: Infotainment system freezing up

A few different fault can cause the screen to lock up like this. The most common would be the touch screen failing, the info system failure, or the radio itself. Since your car is still fairly new, you may want...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.