Skip the auto shop - Our mechanics make house calls

Q: Reduced engine power

asked by on

Ok having issues with reduced engine power.. scanner shows codes p0120, p0220, p1516 need help solving before I buy parts

My car has 154869 miles.
My car has an automatic transmission.

A: Code P0120 relates to the throttle position...

Code P0120 relates to the throttle position sensor and can be caused by the following:

  • Sticking throttle return spring
  • MAP or TPS connector corrosion
  • Misrouted harness causing chafing
  • Bad TPS
  • Bad PCM

Code P0220 relates to the throttle position sensor switch and can be cased by the following:

Code 1516 relates to the throttle actuator control module and can be caused by the following:

  • Faulty Throttle Actuator Control (TAC) module
  • Throttle Actuator Control (TAC) module harness is open or shorted
  • Throttle Actuator Control (TAC) module circuit poor electrical connection
  • Check Throttle Actuator Control (TAC) module connector for water
  • Binding or bent throttle plate-failed throttle body

For this issue I would recommend having a certified expert, such as one from Your Mechanic, come to your home to diagnose these trouble codes firsthand for an accurate repair.

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: Transmission fluid is leaking

I would not recommend driving your truck under these conditions to prevent transmission damage. My first recommendation would be to have your transmission system inspected by an automotive service professional to locate the source of the leak. Possible leak sources...

Q: Hood not opening

Hi. You are fortunate that the latch is accessible. You can get under the front of your car and look up just behind the bumper. You will see the bottom of the hood latch, and the operating cable going into...

Q: Smoke on start up

Sometimes the muffler will hold some moisture when the exhaust cools from the day before. This moisture will evaporate quickly when you first start the engine in the morning and goes out the exhaust as steam. This is most likely...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
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.