Differential or transfer case failure on the 2009 Jeep Grand Cherokee
Only 6 reports for this mode came with an odometer reading, which is too few for percentiles to mean anything. The page is here because someone linked to it; treat the figures as anecdotes, and see the full report for this year instead.
When differential or transfer case failure gets reported
There are 8 reports of differential or transfer case failure on the 2009 Jeep Grand Cherokee, 6 with a mileage attached. That is too few to place the failure on the odometer with any confidence.
A part like this is normally expected to survive 110,000 miles. It is the 9th most-reported problem on this model year.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| — | — | 84,121 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
Putting it right typically runs $900–$4,200 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 23 model years of this car. It shows up earliest on the 2021, at a median of 5,000 miles, and latest on the 2016 at 125,000 miles.
By volume the 1999 carries the most reports, with 115; the 2009 has 8. 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.
Had transfer case recall completed in october had no problem before now cannot put transfer case into neutral. Had car back to my dealer 7 different times twice they kept it for a few days when I get home it will not go into neutral also car was in a dealer in lansing mi. Once and it was in a henderson nv dealer it is now dec. 29 and it will not go into neutral had it in nevada 2 times. Jeep customer service in auburn mi.don't want to help. *tr
After receiving n23 safety recall "fix" lost use of 4WD low range (which also allegedly compromises clutch packs controlling high-range 4WD system torque/power distribution). Jeep dealer diagnosed and replaced transfer case actuator. "fix" lasted 1mo. Returned to dealer; trouble codes cleared. Problem returned in less than 24h. This is the correspondence sent to jeep: ...I believe this to be a software issue, and my reasons are this: 1) the actuator works as designed after all codes are reset/cleared (though the duration for which this works is not consistent) 2) pulling a fuse for the fdcm is the same as "resetting/clearing" the trouble code - this does not point to the hardware as the problem. 3) if I understand the system correctly, losing functionality of this portion of the system, with my quadra-drive ii, causes a safety side-effect of compromised traction control since the clutch packs in the transfer case for AWD function malfunction when the trouble code is lodged. This vehicle operated normally (albeit with risk of a roll-away when remote start is used without the parking brake) prior to the n23 recall. For it to only…
After receiving n23 safety recall "fix" lost use of 4WD low range (which also allegedly compromises clutch packs controlling high-range 4WD system torque/power distribution). Jeep dealer diagnosed and replaced transfer case actuator. "fix" lasted 1mo. Returned to dealer; trouble codes cleared. Problem returned in less than 24h. This is the correspondence sent to jeep: ...I believe this to be a software issue, and my reasons are this: 1) the actuator works as designed after all codes are reset/cleared (though the duration for which this works is not consistent) 2) pulling a fuse for the fdcm is the same as "resetting/clearing" the trouble code - this does not point to the hardware as the problem. 3) if I understand the system correctly, losing functionality of this portion of the system, with my quadra-drive ii, causes a safety side-effect of compromised traction control since the clutch packs in the transfer case for AWD function malfunction when the trouble code is lodged. This vehicle operated normally (albeit with risk of a roll-away when remote start is used without the parking brake) prior to the n23 recall. For it to only…
Also reported on the 2009 Jeep Grand Cherokee
Other electrical problem
Ignition switch, key fob or immobilizer failure
Other powertrain problem
Other engine problem
Other wheel or tire problem
No-start or intermittent start failure
How far this goes
This page is kept out of search results because 8 reports is not enough to publish percentiles from. It stays reachable because somebody looking at this exact car would rather see the reports than be told there are none.
Complaints are voluntary, so 8 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 differential or transfer case failure happen on the 2009 Jeep Grand Cherokee?
Across 6 owner reports that included an odometer reading, half were filed by 85,000 miles. A quarter were filed before — and a quarter after —. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is differential or transfer case failure on the 2009 Jeep Grand Cherokee?
8 reports have been filed with NHTSA, about 0.3 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