2007 Chevrolet Impala: sudden loss of power

Filed Sep 16, 2023 · Electrical, Engine · PA

I started for the first time in early June of having reduced engine power. At this time I get several warrning lights on dashboard. I get engine power is reduced, traction control and engine light. The car goes into limp mode. I replaced the accelerator pedal position sensor after the first event. Since this time I had it happen 4 more times. This situation can be dangerous if a car is behind me and I slow up real quick due to going into limp mode. I try to pull over where I can when this happens. Once I pull over for 10 minutes the car will resume like normal driving with just the engine light on. The next day the engine light usually leaves. It is hard to know when this will occur but it can be a dangerous situation to be in.

Filed Aug 11, 2020 · Acceleration, Engine · 120,000 miles · TX

Had issues with my 2007 impala 3.9l stalling and reducing power on my wife, and at times almost leaving her in or on the road. I have replaced the throttle body, throttle peddle ( twice ) and had the car flashed at the local gm dealer. Now the car not only reads reduced engine power it read starting disabled service throttle and died while she was driving down a busy highway during rush hour.. Causing her to almost be involved in a bad wreck. This seriously needs to have attention of whoever at gm is over safety, cause this issue will end up in a really bad situation if or when someone ends up seriously hurt or killed. I mean you really need to program them to slowly reduce power, not just tell you then shut off completely and have the driver fight and panic to get off the road through traffic, while not getting run over in the process. But if there is a fix we need to know.

Filed Dec 13, 2019 · Engine · 70,000 miles · DE

I was driving my 2007 chevy impala in my neighborhood at 25 MPH, and when I was getting ready to stop at a stop sign, the vehicle started to shake badly with the code "engine losing power." luckily, I was able to pull over and turn the car off. Being 68 years old, I got extremely scared. I turned the car off and tried calling 2 of my children to help me. Not being able to get either one of them. I turned the car back on, and proceeded back home which was only about a half mile from my house. I called the previous owner, and she stated that had happened to her about 6 months prior. Now I am terrified to take it out on the main highway. The car only has 70,000 miles on it and had been garaged kept. Someone please help me regarding why this might have happened. Thank you very much.

Filed May 30, 2018 · Acceleration · 133,000 miles · VA

Car randomly displays reduced engine power. On interstate reduced down to 20mph could have gotten my family killed. Researched online alot of imapala having same issue. This is very dangerous

Filed May 15, 2018 · Driver assistance, Engine · 112,000 miles · KY

I recently purchased a 2007 chevy impala, 3 weeks after purchase while on the highway, the car suddenly slowed down to a crawl, a reduced engine light came on the dash, being as we were on the highway to suddenly only being able to go 20mph was very frightening!! I was able to get the car to the side and had to have it towed home. After searching this issue online I found thousands of complaints from people with the same issue with this same car. I find it strange there was not a recall for this due to it being a serious safety issue. After calling a chevy dealer, they told me all they could do is hook it up for diagnostic tests but it would cost 175.00 just to do that. This vehicle is still parked and we are unable to drive it and still have no idea what's wrong with it. I'm very concerned about driving it again for fear of this happening again and us maybe not being as lucky next time!!!! Serious issue with thousands of complaints online. Simply type in 'reduced engine power' make model and year of car and many people have had this same issue!!!!

Filed May 2, 2018 · Driver assistance, Electrical · 180,000 miles · TX

Vehicle in motion at 70 miles per hour, vehicle shut off and lost power steering, braking, and nearly causing a fatal collision on a highway overpass. Errors on dash stated throttle disabled stop engine, oil pressure low engine power reduced. Upon further investigation there was a recall (expired?) for pedal position sensor due to faulty soldering.

Filed Jul 6, 2017 · CA

Dash says "service traction control" then "engine power reduced" when this first started about 4 months ago, I took the car to my mechanic. He ran a diagnostic and what came up was I needed a "throttle sensor", which meant replacing the gas pedal. He did this. That didn't work so he re-did the pedal. Still getting the service traction control message, with reduced engine power, this happens at random, no one seems to know what the problem is. Now the big problem is- I have to go to the chevy dealership service and pay 150 bucks just for a diagnostic. Which doesn't even go toward solving the problem.

Filed Apr 8, 2016 · Engine · 178,000 miles · MI

In december my car while driving, I experienced reduced engine power the speed immediately dropped without warning and the car cut off. I was stuck in the middle of highway traffic praying that we would not be hit when everyone is doing 70 MPH. When the reduced power light comes on the engine light comes on along with the traction light. I took the car to the dealership to only be told that they are not 100% sure what the problem is, but I can start by replacing the PCM module and that may or may not fix the problem. I have a problem with a chevy dealership not knowing what is wrong with they cars. Especially a car that is having this problem with so many of its car across the nation. This is a huge safety issue. I have been inconvenience since december as I have not been able to drive my car after having this issue and not feeling confident in $1,000 repair that the dealership themselves are not sure is going to fix the issue. I went to the dealership to get to the root of the problem in hopes of getting a solution and solid plan. I think that gm need to be held accountable for this issue and found a good solid solution to the problem and not guessing fixes to make money. We are talking about people lives are being put in danger. Like I felt mine was when you are in the middle line on a highway, where the speed limit is 70 MPH and your car reduce power and then shut down.

Filed Dec 23, 2015 · Acceleration, Engine · 140,000 miles · IL

Tl* the contact owns a 2007 chevrolet impala. The contact stated that while driving at 60 MPH, the accelerator pedal was depressed but the vehicle failed to accelerate as the reduced engine power error message displayed. The vehicle was taken to a dealer where it was diagnosed that the accelerator pedal needed to be replaced. The vehicle was repaired. However, the failure recurred. The manufacturer was notified of the failure. The failure mileage was 140,000.

Filed Dec 21, 2015 · Engine, Fuel system · 148,000 miles · TX

Reduced engine power/ traction control warning/ gas line fuel leak. This car flashed a reduced engine power message while I was going 65 MPH straight away on busy city (in houston) freeway and the traction control warning light came on. My car then immediately reduced speed and would not go beyond 40 MPH. I was told that the gas line fuel leak has nothing to do with it but it seems very coincidental that this all happened in the same day. Gm is putting out a lot of trashy vehicles right now and this should definitely be a recall; especially when there are numerous valid complaints of the same issue. I'll never by gm/chevy again. I am going back to an imported brand

Filed Nov 21, 2015 · 55,000 miles · CT

My son was driving on the highway and the light "reduced power to engine" goes on and the car stalls. After half hour it started but drove slowly so he was able to get of the highway and we had it towed where some work was done such as some sensors. It worked fine for a couple of weeks and last night it did the same thing. He is in college so he took it to local shop and they can't recreate it and don't know what is wrong. They will try some more sensors but this is a hit or miss which is costing real money. Now we don't know when he will be stranded or if it will ever be fixed. Not very reassuring.

Filed Oct 26, 2015 · Engine · 10 miles · IA

Reduced engine power message came, car stopped suddenly in the street.