Ignition switch, key fob or immobilizer failure on the 2003 Chevrolet Malibu
5 crashes 2 fires 3 injuries 10 of the 64 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 ignition switch, key fob or immobilizer failure gets reported
Owners of the 2003 Chevrolet Malibu report ignition switch, key fob or immobilizer failure at a median of 95,000 miles. A quarter of the reports come in before 65,000 miles and a quarter after 127,500 miles, from 52 reports that carried an odometer reading.
A part like this is normally expected to survive 85,000 miles. It is the 4th most-reported problem on this model year.
The mileage distribution
The reported range runs from 55,000 miles at the tenth percentile to 190,000 miles at the ninetieth, a spread of 135,081 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.
2% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 56,095 miles | 65,245 miles | 94,652 miles | 127,010 miles | 191,176 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, 5 a crash, 2 a fire and 3 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–$1,500 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 22 model years of this car. It shows up earliest on the 2016, at a median of 10,000 miles, and latest on the 2015 at 150,000 miles.
By volume the 2003 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.
The car has cut off while I was driving on at least 10 occasions since 2012. Usually, if driving at normal speed it would happen as I slowed down to turn a corner, although it has also happened once or twice while I was driving on the highway. Each time, I was fortunate enough to either drift over onto the shoulder or complete the turn without getting hit. When the car cuts off I lose the ability to steer. During that period I also experienced significant electrical problems: sometimes the turn signals would not come on, the auto locks would come on and off by themselves while driving and the air conditioner would not stay on. On 5/3/12 my key would not turn the ignition. I had the car towed to a mechanic who advised that I probably had too many keys on my ring and it wore down the ignition. Shortly after having the ignition replaced, I noticed the anti-theft system light stayed on and it affected my ability to start the car. For the past 2 years, in order to start my car, I have to put the key in the ignition, then turn it to the "accessory" position for about 15 seconds, then to the "on" position and wait for the gas gauge and…
The car has cut off while I was driving on at least 10 occasions since 2012. Usually, if driving at normal speed it would happen as I slowed down to turn a corner, although it has also happened once or twice while I was driving on the highway. Each time, I was fortunate enough to either drift over onto the shoulder or complete the turn without getting hit. When the car cuts off I lose the ability to steer. During that period I also experienced significant electrical problems: sometimes the turn signals would not come on, the auto locks would come on and off by themselves while driving and the air conditioner would not stay on. On 5/3/12 my key would not turn the ignition. I had the car towed to a mechanic who advised that I probably had too many keys on my ring and it wore down the ignition. Shortly after having the ignition replaced, I noticed the anti-theft system light stayed on and it affected my ability to start the car. For the past 2 years, in order to start my car, I have to put the key in the ignition, then turn it to the "accessory" position for about 15 seconds, then to the "on" position and wait for the gas gauge and…
The car has cut off while I was driving on at least 10 occasions since 2012. Usually, if driving at normal speed it would happen as I slowed down to turn a corner, although it has also happened once or twice while I was driving on the highway. Each time, I was fortunate enough to either drift over onto the shoulder or complete the turn without getting hit. When the car cuts off I lose the ability to steer. During that period I also experienced significant electrical problems: sometimes the turn signals would not come on, the auto locks would come on and off by themselves while driving and the air conditioner would not stay on. On 5/3/12 my key would not turn the ignition. I had the car towed to a mechanic who advised that I probably had too many keys on my ring and it wore down the ignition. Shortly after having the ignition replaced, I noticed the anti-theft system light stayed on and it affected my ability to start the car. For the past 2 years, in order to start my car, I have to put the key in the ignition, then turn it to the "accessory" position for about 15 seconds, then to the "on" position and wait for the gas gauge and…
Also reported on the 2003 Chevrolet Malibu
No-start or intermittent start failure
Other electrical problem
Other speed control problem
Other engine problem
Control module (ECM/PCM/BCM) failure
Fuel pump failure
How far this goes
Complaints are voluntary, so 64 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 ignition switch, key fob or immobilizer failure happen on the 2003 Chevrolet Malibu?
Across 52 owner reports that included an odometer reading, half were filed by 95,000 miles. A quarter were filed before 65,000 miles and a quarter after 127,500 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is ignition switch, key fob or immobilizer failure on the 2003 Chevrolet Malibu?
64 reports have been filed with NHTSA, about 0.7 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