Last post on Oct 29, 2013 at 8:06 AM
You are in the Chevrolet Impala
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Chevrolet Impala, Auto Repair, Electrical, Fuel System, Sedan
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#244 of 483 Re: chevy impala "REDUCED ENGINE POWER" message [gmcustsvc]
Jan 10, 2013 (9:56 am)
I have a 2011 Malibu with 39K on it and was driving 70mph on a busy highway when Service ESC, Service Traction and Reduced Eng Pwr lights came on. The car went down to 40mph instantly...very scary on a busy highway. Local mechanic says it's the throdle position sensors but he doesn't know which one and they are about $500 each. He cleared the codes and the car seems fine right now but I think it's only a matter of time before this happens again. I can't see putting $1500 into the car at this point. Should I try the accelerator pedal as some would suggest on this forum?
#245 of 483 Re: chevy impala "REDUCED ENGINE POWER" message [rq_malibu]
Jan 10, 2013 (11:32 am)
That sounds like a lot of $ for a sensor. Worst case scenario, tell them to fix one at a time, starting with the cheapest. If you hit bulls-eye on the first try, you'll have only spent 500 dollars (still seems like a lot though!). You probably have two sensor up by and on the throttle body, then one on the pedal. If you can do any of these on your own, definitely do so. The manual for your car only costs about 30 bucks. Get that and see if the instructions are in there for doing this. Also, go to youtube and other places to get instructions on how to do this at home.
I think what gave mine away as being the throttle body (as opposed to the pedal) was a slight up and down of rpms while idling. I don't want to say too much though because this forum is for Impalas. But yeah, get that manual; try to change the pedal sensor yourself. If that doesn't work, find the other sensors and see if they are within reason to be done at home!
Most importantly though, see if your car is under warranty!!!
#246 of 483 Re: chevy impala "REDUCED ENGINE POWER" message [dasupa]
Jan 10, 2013 (1:34 pm)
Throttle body should be under drive train warranty. My Chevy dealership told me that if my issue had been the throttle body, it would have been covered but mine was the pedal sensor and it was not covered. I have filed a formal complaint with the NHTSA to see if we can't get a recall on these sensors. They should not be failing this soon in their life span.
#247 of 483 Re: chevy impala "REDUCED ENGINE POWER" message [rq_malibu]
Jan 11, 2013 (11:17 am)
Is your mechanic associated with one of our GM dealerships? If so, we'd be happy to follow up on this with them. Email us at socialmediagm.com with more information (include your name and contact information, the last 8 digits of your VIN and mileage, and a summary of the situation so far).
Sarah, GM Customer Service
#248 of 483 Re: chevy impala "REDUCED ENGINE POWER" message [littlegrayone]
Jan 11, 2013 (11:32 am)
On 2010 model year vehicles on, the throttle body assembly was removed from power train coverage. If you have any questions about any warranties on your vehicle, we're available to get you more information on that (email us at socialmediagm.com with the last 8 digits of your VIN).
Sarah, GM Customer Service
Jan 18, 2013 (1:27 pm)
I have a 2006 Impala SS with just over 100k every time i drive this car it shuts off DRIVING DOWN THE ROAD!! It comes up and says "starter disabled service throttle" OR "engine power reduced". Im not a big person and i cant control it when it shuts down b/c it has no power steering or brakes! I take my children in this car is it going to take someone getting killed because of this issue for Chevorlet to fix it???
#250 of 483 Re: 06 impala SS [kdh12389]
Jan 21, 2013 (9:03 am)
We're sorry to hear that you are experiencing this concern and can understand how it's a frightening experience. If we can check into this further, please contact us at socialmediagm.com with more details (including your name and contact information, the last 8 digits of your VIN and mileage, and a recap of the situation so far).
Sarah, GM Customer Service
#251 of 483 Reduced Engine Power/Service Traction Control
Jan 22, 2013 (11:15 pm)
I was driving my 2009 Chevy Impala on the highway in a snowstorm and received the dreaded Service Traction Control/Reduced Engine Power messages and my car went from approximately 45 mph down to 20 mph and sounded like it was about to kick the bucket. I logged on here and started freaking out seeing people had spent $$$$$ to fix it, My father contacted a family friend who is a GM certified Mechanic and explained the problem... he said its pretty common. Anyways he told him to look at the "Drive by wire" wires going into the Throttle body, sure enough one of the wires was pulled loose from the plug not getting a solid contact and causing a short. With the car running (like garbage on reduced engine power) he pushed this loose wire back into its plug and magically the car immediately began to run like normal. All that's required is to buy a new "throttle body wire harness" which runs for 80$ on car parts discount websites, or trim back the wire insulation and solder the connection back in place. Seems to me from the fixes people posted its either the gas pedal or this wiring harness. To those who have tried the gas pedal replacement and continue to have problems check this wire harness that plugs into the throttle body. Here's a video from Youtube, I know this is a pickup truck but its the same issue, same wire harness, and in the same location under the hood of the Impala.
Loose Throttle Body Harness Wire Fix
#252 of 483 Re: Reduced Engine Power/Service Traction Control [trumble09]
Jan 23, 2013 (4:47 pm)
I have a 2009 Impala with same symptoms and after reading pages and pages of people having this same problem I am amazed. This obviously is an issue that should not be happening at this early age of my vehicle.
This is my last Chevy, too.
Jan 23, 2013 (5:18 pm)
The sad part is I have been dealing with the customes service (like I was asked to) and I have gotten NO WHERE! Trumble09.. my car says "starter disabled service throttle" before I get the "engine powee reduced" message. The car completely dies. I have to get out and take the terminal off to restart it. GMs advise to me was take it to a GM mechanic. The last GM mechanic that worked on my car somehow managed to put antifreeze in the transmission fluid.. I have 2 kids and I'm in college, I don't have the time or money to pay them to tell me they can't figure it out. I absolutely love this car when it's running but after all of this I will NEVER buy another Chevrolet.