really awful
Crashes / Fires:
2 / 0
Injuries / Deaths:
1 / 0
Average Mileage:
60,086 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2005 Mercury Mountaineer engine problems

engine problem

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2005 Mercury Mountaineer Owner Comments

problem #7

Apr 022016


  • 40,000 miles


Sometimes when I'm driving around 35 mph, the car will send an audible warning signal, most of the dashboard lights come on and the engine abruptly shuts off. It never happens with my wife who is the primary driver of this vehicle. This began shortly after purchase and was mentioned to our L/M dealer (before they went out of business). I just made the correlation with the speed control last weekend. In fact, I can duplicate the issue now. The shutoff occurs during deceleration when speed control is engaged around 35 mph. Since my wife only uses speed control on the interstate, it has never happened to her.

- Cincinnati, OH, USA

problem #6

Apr 202015


  • miles
The contact owns a 2005 Mercury Mountaineer. While leaving a drive-thru, the vehicle accelerated independently and crashed into an oncoming vehicle. The air bags did not deploy. A police report was filed. The passenger in the contact's vehicle sustained injuries to the back, neck, and spine which required medical attention. The vehicle was destroyed and towed to a collision center. The failure mileage was unavailable.

- Galveston, TX, USA

problem #5

Apr 022015


  • 133,000 miles
I had the cruise control set on 30 mph driving in a residential area. Without warning, all the lights on my dash flashed, and my vehicle lost all power. Very scary. No more power steering, no power brakes, while coasting through a neighborhood. I put the car in neutral, turned the key off, back on again, and put the car back in drive. That fixed the problem. This is very scary and dangerous!! this is the third time it has happened to me. I am afraid to use the cruise control on my car now :(

- Kaukauna, WI, USA

problem #4

Jul 032014


  • 105,000 miles


The engine has shut off twice while driving using cruise control. The first time I was able to get to the side of road and restart it.. the second time I put it in neutral and restarted it while moving. I am afraid to use the cruise control now - if there had been oncoming traffic we would've had a head-on collision as I was on a corner and went into the other lane. When the engine shuts off, the power steering is gone leaving it very difficult to turn.

- Federal Way, WA, USA

problem #3

Mar 072011


  • 93,000 miles
Speed control shut off while driving on highway @65 mph. Scarey.

- Wethersfield, CT, USA

problem #2

Dec 222010

Mountaineer 8-cyl

  • 48,549 miles
2005 Mercury Mountaineer cruise control emergency while driving my wife's 2005 Mercury Mountaineer at approximately 50 mph and using the cruise control the engine shut off. (dangerous and scary) I immediately placed the engine in neutral and restarted it with no trouble. Fortunately we were on a straight road. The engine shut down appeared to occur because the cruise control de-accelerated the engine while coasting down hill (using the cruise control) to below 400 RPM's. below 400 RPM's the engine stops. The car speed, length of the downward coast, and hill slope appeared to affect the stoppage. If the speed control signals an increase prior to bottoming the RPM's the engine will continue to run, if not it will shut off loosing oil pressure, power steering, and power brakes. My wife doesnżT normally use the cruise control, which is fortunate for her. IżM sure if she were driving when this occurred she would have coast to a stop of worse if it happened while going around a curve. I was able to duplicate this problem four times by picking a hill with the right conditions and setting the speed at around 45 to 50 mph. I called the dealer where she bought the car new and was told there are no recalls on her car, however; while searching the internet we found that the same problem has occurred numerous times on Ford Explorer and Mercury Mountaineer's. we've set and appointment at the dealer for a diagnosis.

- North Wales, PA, USA

problem #1

Oct 052005

Mountaineer 8-cyl

  • Automatic transmission
  • 1,050 miles
Purchased a new 2005 Mercury Mountaineer in 7/31/2005 the first time the car accelerated when the brakes were applied and the car had to be put in neutral to stop. The dealer reported that there were no known fixes for this problem at this time. The second time while pulling into my driveway when the brakes were applied the car accelerated and crash into my garage door. This time the dealer blamed my wife and said she must have pressed the gas and brake peddles at the same time. The car sustained front end body damage and my garage door needs to be replaced. The car has been at the dealer since the accident happened and we are still waiting to find out what is Ford's determination of this issue and what they will do to get us out of this car and into something else.

- Bay Shore, NY, USA

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