AUTOMATIC TRANSMISSION- THIS TRANSMISSION IS HORRIBLE A FEW TIMES I NOTICED THE SEVERE NOISE AND JERK WHEN I WENT TO REVERSE. I THOUGHT PERHAPS IT WAS ME. ON CHRISTMAS EVE I WENT TO PULL AWAY FROM STOP LIGHT AND CAR STARTED TO ACCELERATE THEN SLOWED DOWN I GAVE IT A LITTLE GAS AND IT JERKED ME SO HARD IT HURT MY NECK (WHICH IS STILL BOTHERING ME TODAY). THE OD LIGHT CAME ON AND CHECK TRANSMISSI…
2005 Mercury Mountaineer powertrain problems
severe 18 complaints filed with NHTSA · avg repair $2,500
Complaints
18
Recalls
0
Crashes
1
Avg fix
$2,500
What owners are reporting 4 most recent
REAR DIFFERENTIAL NEEDS REPLACED. MECHANIC SAID CAN BE DANGEROUS. I SEE THAT THESE FORD/MERCURY'S HAVE THIS PROBLEM ALL THE TIME. COST TOO MUCH TO FIX, YET I HAVE WIFE AND KIDS IN THAT CAR. *TR
2005 MERCURY MOUNTAINEER TRANSMISSION JERKS RANDOM INTERVALS AND CAUSES DRIVER TO LOOSE CONTROL OF VEHICLE MOMENTARILY. PASSENGERS INSIDE CAR EXPERIENCE NECK PAIN AFTER SEVERAL OCCURRENCES. *TR
WHILE DRIVING 50 MPH VEHICLE STALLED THREE TIMES. TOOK IT TO A GARAGE, WAS TOLD IT WAS NECESSARY TO HAVE THE VEHICLE WHEN IT STALLED. FOUND ELEVEN (11) SIMILAR COMPLAINTS ON YOUR SITE! PERHAPS THERE IS SOME VALIDITY TO THE COMPLAINTS. ALL PARTS OF THE VEHICLE RELATED TO SAFE DRIVING WERE RENDERED USELESS. SOUNDS LIKE A SAFETY ISSUE TO ME!
Common questions
How serious is the powertrain problem on the 2005 Mercury Mountaineer?
It's a meaningful issue. 18 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
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