2010 Mercury Mariner engine NHTSA complaints: Vehicle Speed Control

NHTSA — Vehicle Speed Control Problems

2010 Mercury Mariner (Page 4 of 4)


really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
2 / 0
Average Mileage:
53,166 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.

2010 Mercury Mariner engine problems

engine problem

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2010 Mercury Mariner Owner Comments (Page 4 of 4)

« Read the previous 20 complaints

problem #6

May 252013

Mariner 6-cyl

  • 84,000 miles


Driving 45 mph when the car lost the ability to accelerate and maintain current speed. The yellow solid wrench light came on, the engine remained running, and the car coasted to a stop. The driver turned off the car waited a couple minutes then restarted and car operated normally. This problem happen four additional times and was diagnosed at a Ford certified dealership as having a defective throttle body. Throttle body was replaced and car operated normally for now. Every occurrence was a potentially dangerous situation as I was in traffic.

- Holt, MI, USA

problem #5

May 292013

Mariner 6-cyl

  • miles
A year ago in July of 2012 not sure the approximate date, I was on my way to work and all of a sudden everything just cut off. I'm in the middle of the road, accelerator to the floor and nothing. I took the car to the dealership same day and they had it all day long and couldn't figure out what caused the short and sent me on my way. Now present day which is a bout a year later I take my car in for a simple safety inspection, wait 10 minutes for the porter to bring me my car to find out its idling and the accelerator is to the floor and its not moving. The gentlemen comes in and tells me its my throttle body going out on the car, he told me this has happened to several people and the part is on back order. He said a guy has had his car sitting there for 10 days and the part has yet to come in. They tell me this needs to be replaced, but ironically enough my warranty expired 4 days ago May 25,2013, which I wasn't aware of. I was at the dealer 2 months prior getting a oil change this didn't dawn on you to tell me it was going to expire. So I came to you with this problem a year ago you had no clue and said have a great day, I've been in every 3 months or so for oil changes since that incident, and you couldn't have noticed this problem before my warranty expired awfully convenient. I'm amazed with all the complaints and problems I've seen about this same issue and no recall has been made. This is dangerous. What it tells me is that Ford doesn't care about their consumers enough to take this matter seriously and correct this error.

- Arlington, VA, USA

problem #4

May 162013

Mariner 4-cyl

  • 50,000 miles
While I was driving on highway at 70mph - in cruise control, car suddenly starting losing speed. Tried to resume speed but was not able to accelerate, so I pulled over. While stopped, car started acting like it wanted to stall so I shut car off and had it towed to shop. Mechanic states they are getting a throttle body error.

- Mims, FL, USA

problem #3

Oct 182011

Mariner 4-cyl

  • Automatic transmission
  • miles


2010 Mercury Mariner. Consumer writes in regards to vehicle hesitation intermittently at various speeds. The consumer stated she began noticing the problem in 2011, after a 2010 update of the transmission software in a factory recall. In addition to the hesitation when trying to accelerate, there were also a few instances where the cruise control seemed to either surge or back down, as if it didn't know quite how to respond, usually, but not always, when on a slight incline. The consumer stated on one occasion, when the vehicle was in park, with the motor idling, she was unable to get the vehicle to go into to gear on the first attempt, when it did shift, it shifted very hard and noisily into gear on the 2nd attempt. Also, the vehicle would shift rough in lower gears, typically from as top or accelerating after slowing to almost a stop. The consumer went to another dealer, after the dealer where she originally purchased the vehicle from, failed to address the problems she experiencing. The second dealer informed her, the transmission valve body was damaged even before the recall came out in 2012. The part was replaced. However, the consumer experienced a hesitation in January 2013. The consumer stated after reading about an investigation of Ford vehicle, which included her model year, she was concerned about the throttle body, which had not been replaced.

- De Pere, WI, USA

problem #2

Aug 012012

Mariner 6-cyl

  • 47,100 miles
This is a letter I wrote to my repair service on 8-3-12. "this has happened three times in the last two days and is a very dangerous vehicle to drive. When driving the vehicle on a side street once and twice on the expressway, the vehicle suddenly loses power and while the engine is running I could not accelerate. The engine light and tool light both came on and twice just the tool light came on (the wrench). Nothing could be done to regain speed. It seemed as though the accelerator pedal was disabled. I had to pull over to the shoulder of the road, turn the engine off and restart the car. If I had not been close to a shoulder, this would have been most dangerous for me and for the traffic behind me. The car just loses all power and getting it to the side of the road and out of the way of traffic is a dangerous endeavor. This car cannot be driven safely. " I drove the car to a close by local repair shop. The same thing happened to a shop employee. The owner of the shop recommended taking the car to a dealer. I am not a timid driver, but I was afraid to drive the car and had it towed ($52.50) to the Ford dealership. The cost to replace a throttle body was $516.08. I read recently that the car was reported to supply limp-home speeds. I did not experience this and definitely feel this is a very dangerous problem.

- Lake Angelus, MI, USA

problem #1

Dec 142012


  • 35,500 miles
The contact owns a 2010 Mercury Mariner. The contact stated that the vehicle stalled twice and without warning. The contact stated that the power train warning light illuminated on the instrument panel after the failure occurred. The contact took the vehicle to the dealer and was told that the throttle body needed to be replaced. The vehicle was not repaired. The failure and the current mielages were 35,500.

- Saline, MI, USA

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