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

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: How to determine a car hose problem

If you are referring to a coolant hose the answer is simple. I would recommend having a certified technician perform a cooling system pressure test on your vehicle. This test pressurizes the cooling system with the engine off in order...

Q: Is my ECM malfunctioning?

Unfortunately, without additional detail as to the codes showing up, there is no way to diagnose what the issues may be. The alternator may be functioning intermittently without having a dramatic impact on the charging system for example. I would...

Q: Won't shift when warm

Hello there, many different faults may be causing your 1988 Chevrolet C2500 not to shift. The most common would be low transmission fluid, shift linkage, transmission range sensor, shift solenoid, or a mechanical transmission fault. Have a qualified technician, such...

Related articles

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.