Skip the auto shop - Our mechanics make house calls

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?

A: For many vehicles, regardless of manufactur...

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?

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: If a fuel filter is plugging up can that restrict the fuel pressure in a fuel injected car

Hey there. Since the fuel filter is an in line filter that the fuel must flow through in order to get to the injectors, this can have an impact on fuel pressure. Depending on how plugged the fuel filter is,...

Q: How many computers does my truck have?

Hi, thanks for writing in. An Isuzu NPR should have one ECM (engine control module), which is the computer. This is the brain of your vehicle. It is what regulates your fuel to air ratio as well as all electrical....

Q: What does the Throttle Control/Transmission light on the dash mean?

While many vehicles have a combined engine and transmission monitoring system that will turn on the Check Engine light if a problem is detected, your Fusion actually has a separate light for transmission and drivetrain problems. It looks like a...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.