2010 Mercury Mariner engine NHTSA complaints: Vehicle Speed Control

NHTSA — Vehicle Speed Control Problems

2010 Mercury Mariner (Page 3 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

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2010 Mercury Mariner:

Unsubscribe any time. We don't sell/share your email.

2010 Mercury Mariner Owner Comments (Page 3 of 4)

« Read the previous 20 complaints

problem #26

Jul 252013

Mariner 6-cyl

  • 56,000 miles


My husband was driving the car at 65 mph on the highway and the care went limp and would not accelerate. He had to pull over to the side and restart the car. This happened to him 3 times and me one time. I took it to a dealership and it is the throttle body. You have received several complaints and there is an ongoing investigation. In addition, the dealership was going to overcharge me for the repair. Please do everything in your power to get Ford to recall this party and reimburse the customer before there is a fatality.

- Kennesaw, IL, USA

problem #25

Jul 212013


  • 64,500 miles
I have no throttle response, engine RPM drop back to an idle, engine runs rough and stalls. No power. Moving to the side of the road, turn engine off and restart and will runs fine, but today this problem recurred every 4 miles. I was only 22 miles from home but that is a lot of stopping along side of the road.

- New London, OH, USA

problem #24

Jul 192013

Mariner 6-cyl

  • 93,300 miles
Was driving on freeway at about 70-75 mph and hesitation occurred and speed uncontrollably decreased. I went to right lane (had been in middle lane) and stopped on the shoulder of the nearest exit lane. Luckily it was very close. I was afraid that I would lose control of steering also. This is 3rd time this happened, so took to dealership and they replaced throttle body assm. For close to $500. Technician said I should be happy now, the new part had been re-designed. I'd be alot happier if Ford had taken responsibility earlier when they realized it needed to be redesigned. The previous occurrence I was in left lane at very busy time on xpressway and had to pull onto the left hand shoulder....very close to being hit.

- Livonia, MI, USA

problem #23

Jun 212013


  • 60,250 miles


I was driving at about 25 mph when the car suddenly lurched forward, then began rapidly decelerating. I had to get off the road and coast to a stop. I turned the car off then restarted it and everything seemed fine, but the problem happened again later that day and several more times in the coming weeks. It has happened at various speeds and under diverse conditions. It is intermittent and unpredictable. After nearly causing an accident on the interstate due to this occurrence I am now limited to surface streets and only when I have no other option but to drive my car. After doing some reading it seems that this is a known defect with the throttle body and I worry that even if I pay out of pocket to have it repaired I will only be buying another part with the same defect. My hope is that Ford will issue a recall of the vehicles for which this is a known issue!

- Baton Rouge, LA, USA

problem #22

Jul 172013

Mariner 6-cyl

  • 89,000 miles
Stalling. After driving 60 miles, some at freeway speeds, we stopped at a crossroad to cross. Upon crossing it ran rough and stalled just as we crossed the street. Waited two minutes, restarted and drove rest of way home with no problem. Posted speed on road we crossed is 55 mph. Had it stalled in front of traffic there could have been an accident. We had our two grandchildren in the back seat. This is the 2nd time in 5 weeks. Had the fuel pump and spark plugs changed the first time. Ran fine until yesterday. No check engine light is coming on. Today I ordered an throttle body.

- Canton, MI, USA

problem #21

Jul 112013

Mariner 6-cyl

  • 51,000 miles
Car went into 'limp mode" at about 25 mph and the orange wrench warning light came on. Had to stop, turned off the engine and then restarted. Warning light went off but it occurred again in about 5 miles. Went to Ford dealer the next day and they could not find anything wrong nor duplicate the problem. Problem happened again a couple of miles after leaving the dealership. I immediately returned to the dealer and they once again couldn't find anything wrong. Two days later on I-95 the car went into "limp mode" the orange light came on and I drove to the side. The traffic was backed up so I was going about 25 mph when this occurred. When I restarted the engine this time, the "wrench" warning light went off but the "check the engine" light came on and remained on. Next day returned to the dealer and this time they said they found the problem and it was the throttle body. In researching on line I found that this is occurring with some frequency and would certainly like to see Ford take responsibility for issuing a defective part. As of now it looks like I will have to pay the bill and hope that the new part is not defective also. It is a real safety issue and hopefully this will be resolved.

- Savannah, GA, USA

problem #20

Jul 152013

Mariner 4WD 6-cyl

  • 52,170 miles


I was driving approx. 55mph on the parkway when my vehicle gave me a kick back (shook a little) and began to decelerate until it completely stopped. I could not get the vehicle to accelerate and had to pull over to the side of the road where I turned the vehicle off, turned it back on, and was able to drive again. I drove approx. 3 miles before the problem occurred a second time, this time I was unable to make it all the way to the shoulder before the vehicle completely stopped so I ended up at a dead stop in a turn lane. I was able to get the car to the shop without any issues occurring again and was told the issue was reading as "P2112 throttle actuator control stuck closed" - the entire part needs to be replaced and will cost me $400 as it is not covered under warranty. I called fomoco and was told that they were not aware of this issue despite many complaints I have seen online through the NHTSA. I am hopeful that Ford will come through and pay for a portion (if not all) of this repair as this was an extremely dangerous incident and one that is clearly occurring with many of their vehicles with the drive-by-wire throttle. If Ford does not recall this, it is only a matter of time before someone is seriously or fatally injured. I can only imagine if I would have been driving down I-95 at the time my throttle failed.

- Fairfax, VA, USA

problem #19

Jun 152013


  • 72,000 miles
The contact owns a 2010 Mercury Mariner. The contact stated while driving various speeds the accelerator pedal was engaged without any response. The vehicle was maneuvered to the side of the road where the engine was turned off. Upon restarting the vehicle, it resumed normally. The failure recurred at least four to five times a day. The vehicle was taken to an authorized dealer where the throttle body was replaced. The manufacturer was not notified of the failure. The approximate failure mileage was 72,000.

- O'fallon, MO, USA

problem #18

Jun 302013

Mariner 6-cyl

  • 92,130 miles
As I was driving about 40 mph my Mariner jerked then lost acceleration. I was able to pull off the roadway safely into a parking lot. After shutting the vehicle off and restarting it I was able to drive a few feet before it happened again. Again shut engine off and restarted. A few days later it happened again and I took it to the dealer who said it was the throttle body and it is on national back order but it is safe to continue driving to vehicle!! as I was driving home a few nights ago this happened again 4 times within 1 mile. Needless to say I will not be driving my vehicle until this is repaired. (and who know how long that will be!). please recall this part before someone gets seriously hurt or killed!

- Wathena, KS, USA

problem #17

Apr 172013

Mariner 6-cyl

  • 41,000 miles
The engine suddenly went from 70 mph to limp mode at about 900 RPM's or so. I was able to get to the shoulder and turn the engine off. I restarted the engine, and it worked normally allowing me to accelerate and leave the expressway. I was not sure what had happened so I did not think anything of it. This has happened four more times since. I thought at first that I had bad gasoline because the engine light went on for the second incident and the car was low on gas. I limped to a gas station that time and filled the tank. After restarting the car everything worked normally, and the engine light turned off. In the subsequent incidents, I did not notice the engine light going on. I just turn off the engine and restarted the car. This is very dangerous to lose power at 70 miles per hour. In one case I had just past a truck on a two lane highway. I noticed that this seems to fall under your NHTSA action #:PE13003.

- Southfield, MI, USA

problem #16

Jun 242013

Mariner 6-cyl

  • 60,900 miles


On multiple occasions I would be driving the car and it would lose all power and the wrench symbol would appear in the instrument panel. I would have to pull over, stop the car and turn it off. It would then start and I could go for an undetermined period of time and it would happen again. This resulted in more than one near miss by other cars traveling on an interstate. I had it repaired by the Mercury dealership who had to order the part since they said this was happening so much it was hard to get the throttle body part needed to repair the vehicle.

- San Antonio, TX, USA

problem #15

Jun 222013

Mariner 6-cyl

  • 51,000 miles
The contact owns a 2010 Mercury Mariner. The contact stated that while driving approximately 30 mph, the vehicle shook violently and stalled. Also, the contact stated that the wrench warning icon and the check engine warning light were illuminated. The failure recurred intermittently. The vehicle was taken to a dealer where it was diagnosed that the electronic throttle body needed to be replaced. The manufacturer was notified of the failure and stated the parts needed to repair the failure were unavailable. The vehicle was not repaired. The approximate failure and the current mileage was 51,000.

- Opelika, AL, USA

problem #14

Jun 282013

Mariner 6-cyl

  • 44,926 miles
While operating vehicle at about 25 mph, the vehicle slowed to a limp. It didn't stall. After turning vehicle off and restarting it seemed fine for a few minutes then slowed again. Had vehicle towed to my mechanic. Code P2112 was indicated and a new throttle body was installed and re-programmed.

- Carmel, IN, USA

problem #13

Jun 212013

Mariner 6-cyl

  • 42,398 miles
I was driving along at 45 mph and the vehicle lost all engine power, but did not die. I stopped the vehicle and shut off the engine. I resterted the vehicle and it started fine. I drove two miles and engine lost power again. This time the check engine light came on. I shut the vehicle off and resterted. Check engine light was still on, but I was able to drive one mile to a friends house. I let it sit for 4 hours and drove 1/10 of a mile and engine lost power again. My friend gave me a ride home as I was 12 miles from home. I called a towing service and had vehicle towed to local garage. Computer code registered a P2111. I contacted local Ford dealership and they recommended a throttle body cleaning because vehicle was out of warranty by 6,000 miles. Had service performed on 6/24. On 6/29 the engine stalled again.

- Centralia, MO, USA

problem #12

Jun 182013

Mariner 6-cyl

  • 64,000 miles
Car stalled multiple times and went into what the dealership calls limp mode. I was informed I have a bad throttle body and motor asy - [ds7Z9E926A], it is my understanding there is a nationwide back ordered on this part. The vehicle is used primarily on the freeway at speeds in excess of 65 miles per hour. It is my understanding there has only been a few hundred complaints. I wish to add one more to the list. I am being told no eta on when Ford will get the back order of parts cleared up. 6 ? 8 weeks without my primary vehicle.

- Westland , MI, USA

problem #11

Jun 222013

Mariner 6-cyl

  • 37,500 miles
I was driving down a busy highway when my car jerked and then stalled. The accelerator would not work. I was able to pull over and turn the car off. The car restarted and accelerated normally. This occurred three more times. I took the car to the dealership and they said the part was on national backorder and sent me home (in the unsafe car). I now am waiting to hear about when they can get the part.

- Arlington, VA, USA

problem #10

Nov 142012


  • 85,000 miles
The car just died on the motorway and left me in a dangerous situation. The problem is an ineffective throttle body ( code P2111 ).

- Saint Petersburg, FL, USA

problem #9

Jun 152013

Mariner 6-cyl

  • 41,000 miles
Was driving on interstate highway and accelerator speed dropped to a crawl. Pulled over and saw the wrench symbol. Got the manual out and it said throttle body/powertrain issue. Waited and restarted only 2 miles down the road again and that same thing happened. Car was still running but just going abt 2 mph if that. Very dangerous situation!

- Chesapeake, VA, USA

problem #8

Jun 142013


  • miles
Had test done and was told throttle body is bad. Can not get part in because its on back order.

- Mulberry, FL, USA

problem #7

Jun 012013


  • 60,000 miles
The contact owns a 2010 Mercury Mariner. The contact stated that while traveling 40 mph, the vehicle suddenly decelerated and would not go more than 2 mph. The contact took the vehicle to the dealer and it was determined that the throttle body had failed. The vehicle was not repaired. The failure and current mileages were 60,000.

- Front Royal, VA, USA

Read the next 6 complaints »

Not what you are looking for?