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ProblemsByVin Index / 2010-MERCURY-MOUNTAINEER / COMPLAINTS
Full complaint record · NHTSA

2010 Mercury Mountaineer owner complaints

13 complaints filed with NHTSA on this vehicle . Listed by category, newest first within each section.

other 2 complaints shown

12/31/2019 ODI #11292295.0

Tl* the contact owns a 2010 mercury mountaineer. While the contact's wife was driving 70 MPH, she depressed the brake pedal and the front driver's seat started to slide backwards and the interior lighting illuminated. There were no warning indicators illuminated. The driver lost control of the vehicle as it made a 360 degree spin. The vehicle was not diagnosed or repaired. The dealer was not contacted. The manufacturer was informed of the failure. The failure mileage was unknown.

12/08/2019 90,500 mi ODI #11287792.0

Doors locking mechanism malfunctioning and coding numbers not functioning. Being locked out when using code #s. Chain crankin harshly but not unlocking doors. When using key instead of code key does not unlock nor lock any doors except drivers door lock.

steering 2 complaints shown

10/05/2014 38,000 mi ODI #10641517.0

See below from: tier 1 email - crcfmc [mailto:crcfmc@Ford.com] sent: thursday, march 20, 2014 8:57 am to: [xxx] ct: re: vehicle service issues crm:01660000000018 hello[xxx] my name is [xxx], I am from Ford`s customer relationship center (crc). I have reviewed your email regarding the concerns on your 2010 mountaineer. I apologize for any inconvenience this has caused. Ford motor company considers the satisfaction of its owners to be one of its most important objectives. We commit very substantial resources and effort in a sincere attempt to resolve the concerns of our owners. However, limits must be placed on those efforts. After careful consideration we are supporting the previous decision and will not be able to reimburse you for the cost of repairs. Thank you fo

05/30/2012 6,125 mi ODI #10460011.0

Pulled into parking space, placed shifter in park, turned off ignition, released brake and vehicle rolled backwards as if not in park. Attempted to restart vehicle and no response. Set parking brake. Could not get vehicle to lock into park, shifter moved regardless of brake on or not and would not start. Moved shifter through entire range of gears and returned to park, vehicle still would not start and park would not hold. Called dealer and was told to have it towed in. Returned to vehicle and tried once more and it started and proceeded to respond normally. Vehicle taken directly to dealer who could not find any problem or cause of preceding situation. On two subsequent dates (most recent 5/25/2012), vehicle was backed into a parking space, placed in park and ignition turned off. When an

brakes 2 complaints shown

03/28/2015 38,000 mi ODI #10702320.0

Front brakes started automatically seizing up random times and speeds due to a defective wheel bearing that disrupted the antilock brake sensors. This created an extremely dangerous driving issue. Ford refused to take responsibility or pay for any repairs because it was outside the warranty period. *tr

03/25/2014 38,660 mi ODI #10574800.0

From: tier 1 email - [xxx] sent: thursday, march 20, 2014 8:57 am to: [xxx]subject: re: vehicle service issues crm:01660000000018 [xxx], my name is [xxx], I am from Ford`s customer relationship center (crc). I have reviewed your email regarding the concerns on your 2010 mountaineer. Ford motor company considers the satisfaction of its owners to be one of its most important objectives. We commit very substantial resources and effort in a sincere attempt to resolve the concerns of our owners. However, limits must be placed on those efforts. After careful consideration we are supporting the previous decision and will not be able to reimburse you for the cost of repairs. Thank you for contacting Ford motor company. We are sorry that we were not able to meet your expectation

powertrain 1 complaint shown

12/10/2018 ODI #11157272.0

Rear differential is filling with water pass the fill plug. This is a garage kept car and never off road nor dirven in deep water. First time discovered at 22000 miles and the dealer replace the pinion seal and oil, but could not find the cause. Differential now making noise and again full of water past the fill plug. Searched online and found several people with the same problem with Ford products. Dealer cannot find or not willing to find the cause. Called Ford and they offer little to no support. Guess they are waiting for the differentials to lock up at highway speed and kill a dozen of so people.

body 1 complaint shown

10/14/2013 31,000 mi ODI #10547840.0

There is a manufacturing fault with the position of the brake and the gas pedal. It is very easy to move the right foot from the gas to the brake and leave enough of the foot on the gas at the same time. It allows the brake to be pressed but also applies gas to give a vehicle a surge while braking. Had the same situation with a 2001 Ford taurus and Ford issued a recall notice to have the placement of pedals changed. *tr

seatbelts 1 complaint shown

09/29/2015 60,000 mi ODI #10778536.0

Tl* the contact owns a 2010 mercury mountaineer. The contact stated that while attempting to latch both of the second row seat belts, the belts fractured and detached from the vehicle. The vehicle was taken to the dealer. The technician was unable to determine the cause of the failure. The manufacturer was made aware of the failure. The failure mileage was 60,000.

fuel system 1 complaint shown

08/09/2013 55,000 mi ODI #10534451.0

While driving the mountaineer I was slowing for a stoplight shortly after starting it up (had driven about 1/3 mile). The engine suddenly started to speed up and required significant extra braking force to come to a stop. I put the car in neutral and the engine ran at about 3,300 RPM for about 10 seconds. This is the third time this has happened. The first time the thermostat was replaced. The second time the throttle body was replaced. The third time the vehicle was checked but no defect could be found. The second time I also put it in neutral and it also ran at about 3,300 RPM for about 10 seconds. *tr

engine 1 complaint shown

06/26/2016 65,000 mi ODI #10876658.0

At high speeds, the car stalls. It also stalls at stop lights. This happens repeatedly, and Ford cannot figure out what is wrong with it.

electrical 1 complaint shown

06/07/2022 109,000 mi ODI #11468066.0

The contact owns a 2010 Mercury Mountaineer. The contact stated that the check engine warning light was illuminated. The vehicle was taken to an independent mechanic to be diagnosed. The contact was informed that the computer had provided an incorrect error code. The vehicle was also diagnosed by an authorized Ford tech who confirmed the failure with the computer. The manufacturer was contacted and informed of the failure. The manufacturer referred the contact to the NHTSA to file a complaint. The vehicle was not repaired. The approximate failure mileage was 109,000.

cruise control 1 complaint shown

02/28/2013 1,000 mi ODI #10500740.0

Tl* the contact owns a 2010 mercury mountaineer. The contact stated that while braking to a stop, the vehicle would lunge forward. The vehicle was taken to the dealer where they advised him that they were unable to diagnose the failure. The vehicle was not repaired. The manufacturer was contacted and they offered no assistance. The failure mileage was approximately 1,000. The current mileage was approximately 30,000.

Source: National Highway Traffic Safety Administration (NHTSA) owner complaint database. Last synced 2026-06-28. Complaints are owner-submitted and unverified — the existence of a complaint is not proof of a defect, but a pattern of complaints around the same component is a signal worth weighing. Verify any specific filing at nhtsa.gov.
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