Control module (ECM/PCM/BCM) failure on the 1997 Jeep Grand Cherokee
1 crash 1 injury 2 of the 23 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 control module (ecm/pcm/bcm) failure gets reported
Owners of the 1997 Jeep Grand Cherokee report control module (ECM/PCM/BCM) failure at a median of 120,000 miles. A quarter of the reports come in before 110,000 miles and a quarter after 205,000 miles, from 19 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 16th most-reported problem on this model year.
The mileage distribution
The reported range runs from 90,000 miles at the tenth percentile to 230,000 miles at the ninetieth, a spread of 141,000 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.
0% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 89,000 miles | 107,500 miles | 122,000 miles | 205,000 miles | 230,000 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 a crash and 1 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 $700–$3,000 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.
The same failure on other years
The same failure is reported on 25 model years of this car. It shows up earliest on the 2013, at a median of 5,000 miles, and latest on the 1998 at 160,000 miles.
By volume the 2014 carries the most reports, with 52; the 1997 has 23. 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.
I have a 1997 jeep grand cherokee that has an electrical defect in the power distribution center (fuse box ) under the hood. It blows fuses to the automatic shutdown relay,powertrain control module. Without warning the vehicle will shut off and not restart which also leaves you without power brakes or steering it is a well known defect by jeep dealers and mechanics yet nobody does anything about it a small wire needs replaced to fix the problem. *jb
Tl*the contact owns a 1997 jeep grand cherokee. While driving between 65-70 MPH on normal road conditions, the vehicle hesitated and vibrated. Suddenly, the vehicle stalled without warning and the RPM's decreased excessively low. There were no warning indicators illuminated on the instrument panel. The engine restarted after 15 minutes and then resumed operation; however, the performance was poor. The vehicle was taken to an authorized dealer for diagnostic testing and they stated that the failure was related to the primary control module (PCM). The vehicle was repaired. The VIN was unknown. The failure and current mileages were 100,000.
Tl* the contact owns a 1997 jeep grand cherokee. While driving 30 MPH he rear-ended another vehicle. The vehicle was severely damaged, and none of the air bags deployed. Consequently he sustained major injuries to his neck, chest and legs. The vehicle was towed to his place of residence. The vehicle was repaired according to recall# 97v080000 (air bags: frontal: sensor/control module) in 1997. A technician from the dealer was in the process of determining the cause of the failure. A police report was available. The failure and current mileages were 140000.
Also reported on the 1997 Jeep Grand Cherokee
Other powertrain problem
Other fuel system problem
Fuel gauge or level sensor failure
Premature brake pad or rotor wear
Other body or interior problem
Differential or transfer case failure
How far this goes
Complaints are voluntary, so 23 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 control module (ecm/pcm/bcm) failure happen on the 1997 Jeep Grand Cherokee?
Across 19 owner reports that included an odometer reading, half were filed by 120,000 miles. A quarter were filed before 110,000 miles and a quarter after 205,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is control module (ecm/pcm/bcm) failure on the 1997 Jeep Grand Cherokee?
23 reports have been filed with NHTSA, about 0.1 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