Other driver assistance problem on the 2011 Chevrolet Impala
1 injury 1 of the 102 reports for this failure mention a crash, a fire, an injury or a death. Those are the owner's words on the complaint form, not a verified finding, and one report can mention more than one.
When other driver assistance problem gets reported
Owners of the 2011 Chevrolet Impala report other driver assistance problem at a median of 70,000 miles. A quarter of the reports come in before 47,500 miles and a quarter after 100,000 miles, from 96 reports that carried an odometer reading.
A part like this is normally expected to survive 45,000 miles. It is the 2nd most-reported problem on this model year.
The mileage distribution
The reported range runs from 35,000 miles at the tenth percentile to 135,000 miles at the ninetieth, a spread of 100,500 miles across the middle 80% of reports.
When the reports scatter this far, the mileage is telling you about how these cars were driven more than about the part itself.
10% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 34,500 miles | 47,716 miles | 70,062 miles | 100,589 miles | 135,000 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Of these reports, 1 an injury is mentioned. Owners write their own complaints and the agency does not verify them, so read this as what the reports say happened rather than as a confirmed count.
Putting it right typically runs $250–$1,800 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 16 model years of this car. It shows up earliest on the 2016, at a median of 50,000 miles, and latest on the 2003 at 150,000 miles.
By volume the 2011 is the worst of them, which makes this a problem of this specific year rather than of the model as a whole.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
On 5/11/12, the "service stabilitrak" light came on; then a notice that the engine power was reduced came on. I called the dealer for service and he said I could bring it in on 5/14. I asked if it was dangerous to drive in the meantime and he said no. I was driving on 5/12 and was stopped in traffic waiting to turn left. I went to turn left and experienced a greatly reduced response from the gas pedal which was frightening. The dealer just called me on 5/14 and said the problem was in the accelerator pedal and he is replacing it. I found a number of complaints online of this same issue going back to the 2007 model. I think this should prompt a safety recall, since a non-responsive accelerator pedal is a safety issue. *js
While driving on city beltway, I was changing lanes at 50 -55mph when my car experience shudder and the messages that came on screen was engine reducing power, check stability control, check traction control lights flash and what appeared to be rough idling. The next incident happen off and on for several days. The last known was 1/3/2013 630am and 115pm I would have to sshut down and restart until the message disappears. The thing that really shook me up was when I was merging onto the highway in the morning around 6:45am there was a semi and other vehicles behind me so I attempted to merge at about 30-50 when the messages appeared and the semi was practically on my tail. My heart jumped out my chest but I remained calmed and luckily there was a median strip ahead. I ask myself situation could have gone wrong and caused a major accident or gotten killed from being rammed from behind all because I could'nt accelerate.I have a small video to back this up. I took it to the dealer and they said that there was no recall notice and that they would need to get the code and charge me 129.00 for diagnostic. This is clearly a safety issue…
My 2011 impala is reading "service throttle. Reduce engine power" and then proceeds to shut down. Even after replacing accelerator pedal position sensor, vehicle is still reading same errors. This is very dangerous because there is no limitations to when the vehicle shuts off. After extensive research, a lot of people are having the exact same issue and chevrolet hasn't attempted to do anything about it. Please help! *tr
Also reported on the 2011 Chevrolet Impala
Other engine problem
Other electrical problem
Other body or interior problem
Other speed control problem
Other powertrain problem
Other brake problem
How far this goes
Complaints are voluntary, so 102 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does other driver assistance problem happen on the 2011 Chevrolet Impala?
Across 96 owner reports that included an odometer reading, half were filed by 70,000 miles. A quarter were filed before 47,500 miles and a quarter after 100,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is other driver assistance problem on the 2011 Chevrolet Impala?
102 reports have been filed with NHTSA, about 1.5 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed