Q: I have a 2007 chevy impala ltz with 3 codes coming on P0121 / P1516 / P2135 ,accelerater pedal an throttle body have been replaced

asked by on

My car has 3 engine codes coming on they are P0121 / P1516 / P2135 , i have switched both the throttle body an the accelerator pedal an had a reprogramming but "engine power reduce" and "service traction control" wont leave , i have mechanics saying its an electrical problem an the people sayin its a mechanic problem . The car does shut off on the freeway at around 60 mph or when coming to a stop , if you could please help me out that would be great Thank you My car has an automatic transmission.

Trouble Code P0121 can set if there are faults in the wiring or terminal connections to the throttle/accelerator position sensor. Circuity integrity should be checked and the output of the sensor should be viewed on a scan tool to confirm operation or, if the circuit is faulty, confirm the misoperation. P2135 can also set if the position sensor circuit is faulty, again if the circuit is open or if there is corrosion, high resistance, a short, damaged wiring or broken electrical connections. With regard to the third code, P1516, that also will set if there is any fault in the circuit. The bottom line is it is not enough for the sensor to function or be "new"; the the signal from the sensor must get to the computer and for that to happen the wiring must be pristine. Unless circuit integrity has already been confirmed relative to these three codes, a diagnostic should be performed. The relevant service to request is a Check Engine Light diagnostic. If a circuit fault is found during the diagnostic, the same mechanic who performs the diagnostic would perform the repair, right at your location. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.

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. I have a 2007 chevy impala ltz with 3 codes coming on P0121 / P1516 / P2135 ,accelerater pedal an throttle body have been replaced

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: Clumping or bottoming out noise on hard bumps

Hi there. It definitely sounds like the bushings you mentioned could be the cause of the noise. However, worn shocks/struts can create a similar feeling or noise if they are worn out and not providing the dampening force necessary to...

Q: Chain dragging sound left rear

Hello. You should check if your parking brake is working properly. If you apply the parking brake from a very slow roll (2-3 mph), your Fit should stop straight and not pull to the left or right. I suspect something...

Q: I have a loss of power and I can't really press on the gas too hard or the engine will start shaking/stalling

The engine may have a vacuum leak in the throttle intake tube between the mass air flow sensor and the throttle body. Or the mass air flow sensor may not be working correctly or is contaminated. Have the computer scanned...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.