1999 Mercury Mountaineer Transmission and drivetrain Problems
- Complaints
- 8about this part
- Share
- 5%of 151 total for the year
- Median mileage
- 68,500miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 8 complaints about the transmission and drivetrain of the 1999 Mercury Mountaineer, 5% of the 151 complaints for this model year. Where a mileage was given, the median is 68,500 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“1999 Mercury Mountaineer. Leak in rear differential at 40,000 miles. Replaced pinion seal. At 67,000 miles, a loud, whine emitted from rear axle when driving (regardless of speed) and the mechanic advises us to replace rear differential bearings or entire rear differential. If we don't, we fear the rear axle will fail, causing a crash.”
NHTSA complaint #10116705, filed 2005-04, 67,000 miles“Dt: was driving and the SUV threw itself into 4 wheel drive low, causing rapid deceleration of vehicle. It was raining and it happened without warning. Ford has special service messages #508000 drive line trasfer case concerns. Contact has concerns about not being notified by manufacturer about problem.SUV is at dealer now and is still under warranty. Contact says is is very dangerous when this happens in traffic and rain.”
NHTSA complaint #10120444, filed 2005-05, 54,000 miles“Brakes failed seven times within 70,000 miles. An independent mechanic determined that the gem control module was the problem. When the gem control module malfunctioned, the brakes failed, and the 4-wheel drive didn't operate. Also, windshield wipers operated intermittently.”
NHTSA complaint #10050127, filed 2003-12, 70,000 miles“The contact owns a 1999 Mercury Mountaineer. The contact stated that while driving at 30 MPH, the check engine warning light illuminated. The failure occurred on multiple occasions. The vehicle was taken to an independent mechanic where it was diagnosed that the spark plugs needed to be replaced. The vehicle was repaired but the failure persisted. The manufacturer was not notified of the failure. The VIN was not available. The approximate failure mileage of the vehicle was 128,000.”
NHTSA complaint #10617975, filed 2014-07, 128,000 miles“1999 Mercury Mountaineer developed problems with the windshield wipers, tires, driver's side mirror, linkage on the transmission, check engine light and the airbag light.”
NHTSA complaint #10137734, filed 2005-09Related service bulletins
- 10017891Apr 1, 2005Front axle leaks fluid from vent tube - vehicles equipped with 4x4 or awd.
- 10014086Dec 13, 2004General (pcm) power train control module programming procedures.
- 10013369Nov 1, 2004General power train control module (pcm) programming procedures.
Transmission and drivetrain: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2010 | 2 | 15% |
| 2008 | 9 | 9% |
| 2007 | 25 | 31% |
| 2006 | 39 | 33% |
| 2005 | 19 | 23% |
| 2004 | 64 | 30% |
| 2003 | 42 | 28% |
| 2002 | 144 | 39% |
| 2001 | 1 | 5% |
| 2000 | 15 | 12% |
| 1999 | 8 | 5% |
| 1998 | 9 | 4% |
| 1997 | 8 | 2% |
Other parts of the 1999 Mercury Mountaineer
51 complaintsVisibility (wipers, defrost, mirrors)
22 complaintsAir bags
14 complaintsEngine cooling
12 complaintsVehicle speed control
11 complaintsElectrical system
10 complaintsBrakes
9 complaintsEquipment
6 complaintsSeats
4 complaintsSteering
4 complaintsBody and structure
4 complaintsSuspension
4 complaints
← All problems reported for the 1999 Mercury Mountaineer
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology