Other speed control problem on the 2008 Chevrolet Impala
4 crashes 1 fire 2 injuries 7 of the 74 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 speed control problem gets reported
Owners of the 2008 Chevrolet Impala report other speed control problem at a median of 92,500 miles. A quarter of the reports come in before 60,000 miles and a quarter after 132,500 miles, from 66 reports that carried an odometer reading.
A part like this is normally expected to survive 78,000 miles. It is the 6th most-reported problem on this model year.
The mileage distribution
The reported range runs from 40,000 miles at the tenth percentile to 177,500 miles at the ninetieth, a spread of 137,000 miles across the middle 80% of reports.
A spread this wide points at use rather than design. Towing, climate, service history and city mileage all move a failure like this, so the median is a weak guide to any individual car.
9% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 40,500 miles | 59,627 miles | 93,548 miles | 132,000 miles | 177,500 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, 4 a crash, 1 a fire and 2 an injury are 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–$2,000 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.
This mode is classified as critical, which means a failure can leave the car unable to stop, steer, or stay out of the way of traffic. It is weighted accordingly in the risk score.
The same failure on other years
The same failure is reported on 17 model years of this car. It shows up earliest on the 2014, at a median of 50,000 miles, and latest on the 2002 at 130,000 miles.
By volume the 2009 carries the most reports, with 105; the 2008 has 74. A mode that appears across most years of a model is usually a design choice rather than a bad batch.
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.
Tl*the contact owns a 2008 chevrolet impala ltz (na). While driving at any speed and attempting to accelerate, the contact noticed a delay in upshifting or downshifting before the vehicle would actually accelerate. Both the dealer and the manufacturer stated that the problem was normal. The vehicle had not been repaired. The current mileage was approximately 16,000. The failure mileage was approximately 12,000.
Tl* the contact owns a 2008 chevrolet impala. The contact stated while driving 65 MPH, her vehicle stalled. The contact had to maneuver through traffic in order to avoid a crash. The auto throttle body disabled light illuminated on the instrument panel. The contact did not try to restart the vehicle. The vehicle was towed to her home. The vehicle was taken to the dealer who determined the accelerator sensor malfunctioned. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 178,000. The VIN was unavailable.
I was going down the road and out of no where my car says service traction control, followed by service stabilitrak, followed by engine power reduced with a check engine light on. Lost almost all power to the car, could barely turn the wheel and the brakes felt extremely strange. I could only go about 5mph tops down the road. Luckily I was only 2 min from home. Which actually took 6 min because of the reduced engine speed. Right before I pulled in the driveway the motor died. The next day I went out and tried starting it. The remote start wasn't working and my check engine light was still on but it did start up with a turn of the key. I looked up codes and found that it was telling me the accelerator pedal sensor was bad. I have googled this issue and found that it is a very dangerous, common problem with the chevy impala. Although that is the code it is giving me, other people have had to replace their throttle body to resolve the problem. Gm should recall it before someone gets hurt. I will not be buying another gm vehicle in the future because they are too cheap to fix this common issue which could essentially cost someone…
Also reported on the 2008 Chevrolet Impala
Other electrical problem
Other engine problem
Other suspension problem
Other powertrain problem
Other body or interior problem
Other steering problem
How far this goes
Complaints are voluntary, so 74 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 speed control problem happen on the 2008 Chevrolet Impala?
Across 66 owner reports that included an odometer reading, half were filed by 92,500 miles. A quarter were filed before 60,000 miles and a quarter after 132,500 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is other speed control problem on the 2008 Chevrolet Impala?
74 reports have been filed with NHTSA, about 1.1 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