2008 Mercury Mariner engine NHTSA complaints: Vehicle Speed Control

NHTSA — Vehicle Speed Control Problems

2008 Mercury Mariner (Page 1 of 2)

CarComplaints.com Seal Of This Might Hurt

CarComplaints.com Notes: The 2008-2011 Mercury Mariner has a dangerous problem with the power steering that Ford says they fixed when they didn't -- at least not 100%.


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
71,914 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.

2008 Mercury Mariner engine problems

engine problem

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2008 Mercury Mariner Owner Comments (Page 1 of 2)

problem #24

Dec 292016


  • 72,300 miles


My wife and I were driving home on the interstate. We had just merged to the passing lane to allow traffic merging from an on ramp to enter the interstate a vehicle next to us was doing the exact speed as we were which was 72 mph set cruise control. I had vehicles approaching from the rear and since I was in the passing lane decided to speed up and get in front of the car beside us I pushed the accelerator on our 08 Mercury Mariner with a 3.0L engine to the floor and the car accelerated in front of the other car, when I lifted my foot off the accelerator the car continued to accelerate. I pushed on the brake once with nothing changing the car continued to accelerate. I proceeded to pump the brake three additional times in about 1 second intervals. Finally the accelerator pedal release and the car slowed down. We preceded home without further incident. This is a very dangerous condition and has resulted in serious injuries and deaths in earlier model years of Ford escape, Mercury Mariner and Mazda tribute vehicles. I have had Ford vehicles my whole life and have been working on vehicles for more than thirty five years. This is not normal and is not the only time or vehicle this has happened to in this year there are many other similar people that have similar complaints on these Ford and Mercury SUV's on the internet ex: Carcomplaints.com to name just one. The internet is filled with these dangerous complaints. When are you going to live up to your name and put the safety aspect first, when dealing with these to rich to be bothered by recalls auto manufacturers?

- Mooreton, ND, USA

problem #23

Oct 132012


  • 80,000 miles
The contact owns a 2008 Mercury Mariner. While driving approximately 30 mph, the accelerator pedal assembly fractured without warning. The contact reconnected the arm; however, the failure recurred. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 80,000.

- Louisville, KY, USA

problem #22

Mar 202016


  • 77,000 miles
Speed shift forced on 2nd and 4th, the vehicle has only 77000 miles and transmission is bad, contacted the dealer about the problem and no action taken, they said the vehicle is not on a recall campaign and owner needed to do repair and if the campaign started on this problem in the future they will reimburse the repair amount, I need the vehicle on a daily basis and now I'm stock with the repairs cost of 1500 plus labor. I need to add this vehicle to the recall as shown here: Report receipt date: Sep 29, 2015 NHTSA campaign number: 15V606000 component(s): Power train the vehicle was in motion when it happened, speed was reduced and wrench light came on the dashboard

- Union City, NJ, USA

problem #21

Mar 162016


  • 96,000 miles


The contact owns a 2008 Mercury Mariner. The contact stated that while driving and depressing the accelerator pedal, the vehicle would hesitate to accelerate over 15 mph and the service warning light illuminated. The vehicle was taken to a dealer where it was diagnosed twice that the throttle control module needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 96,000.

- Philadelphia, PA, USA

problem #20

Feb 012016


  • 115,000 miles
Same results of the consumer satisfaction program 13N03. A defective throttle body. Car began to stall/choke out while accelerating. It continued to do so until it finally left me on the side of the road. Ford is aware of the problem but because my car was built at a different time/plant does not offer assistance for a known unsafe problem. This started on the freeway and continued after I exited for fear of stalling on the freeway. Car has to be towed/repaired at my expense. A friend has the same model vehicle/same problem last year, but due to her car being built at that plant/time was compensated for the same exact problem. Again, Ford is aware of the problem but minimizes coverage. I can't help but think of what could have happened if my wife/daughter had been driving(at night). In reality, it is unsafe and I could have been killed.

- Houston, TX, USA

problem #19

Jan 072015


  • 83,000 miles
The contact owns a 2008 Mercury Mariner. The contact stated that the vehicle lunged forward excessively while attempting to accelerate. The contact engaged her brakes and when releasing the brake pedal the failure recurred. The vehicle was taken to the dealer where the technician was unable to find a failure. No repairs were made to the vehicle. The manufacturer was not made aware of the failure. The failure mileage was 83,000.

- Columbus, OH, USA

problem #18

Jan 092015

Mariner 4-cyl

  • 98,000 miles


In cold weather my gas pedal sticks. Even after I have started my car and let run for 10-15 minutes. When I get in, reverse to forward position and try to accelerate- the gas pedal sticks. I have to slam on it for about 2 minutes before it actually works. This has happened while driving as well, not just the initial start. It definitely happens more in cold weather. What can I do? after research this sounds like it's a common problem with 2008 Mercury Mariners. I believe it's definitely a safety issue.

- Bartlett, IL, USA

problem #17

Oct 092014

Mariner 4WD 6-cyl

  • 146,000 miles
Acts like throttle body failure. No power when accelerating but rpms go up and then surges when finally throttle works. Wrench light on.

- Westminster, CO, USA

problem #16

Mar 292014

Mariner 6-cyl

  • 77,000 miles
I had just made a right turn and was proceeding down the block when I heard a sudden "click" and lost power. I couldn't steer and there was no power. I managed to get the car over to the curb and turn off the engine. I restarted it a few minutes later and it started up ok. However, the rsc warning light stayed on even though I had never pressed that button. This is not the first time this has happened. The first time it happened I was told it was a battery problem so I got a new battery. That was less than a year ago and I can't imagine I need a new battery that often - that simply needing a new battery will cause my car to fail! in doing some research I've come across several instances of the same issue necessitating replacement of the throttle body module with trouble codes P2111 and P2112 and, in fact, the North Carolina consumers council (nccc) has officially petitioned the national highway safety administration (NHTSA) for a defect investigation of alleged throttle body failures in 2005-2012 Ford escape vehicles sharing the same or substantially similar part. Luckily I was only on surface streets and not the freeway. It's only a matter of time before this happens on the freeway! is there going to be a recall?

- Lake Balboa, CA, USA

problem #15

Mar 152013

Mariner 4-cyl

  • 75,000 miles
Without warning the gas pedal sticks, will not function. This happens intermittently and seems to disappear when the car warms up, but also has happened when the car is warm. Very dangerous when trying to accelerate or just drive normally. This seems to be a widespread problem with both the Ford escape and the Mercury Mariner. We have been stranded several times. This needs to be fixed by the manufacturer.

- Easley, SC, USA

problem #14

Feb 172014


  • 102,000 miles


While driving my car stalls without warning then it jerks real hard and takes off so I have to ride the brakes after coming to a stop before I can press the gas peddle it takes off so I ride the brakes. While driving again it picks up speed on its own very scare please help.

- Houma , LA, USA

problem #13

Nov 152013

Mariner 4-cyl

  • 52,000 miles
Vehicle does not accelerate from rest. Press gas pedal - vehicle does not go - then all of sudden it takes off. Dangerous scenario at stop lights. Dealer says issue is defective throttle body.

- Coralville, IA, USA

problem #12

Jan 102014

Mariner 4-cyl

  • 91,526 miles
I pulled into a gas station to turn around. When I came to a complete stop and pressed the gas pedal to go, my gas pedal wouldn't budge it was like it was stuck. When I pulled on the highway it done it again but it took longer to get my gas pedal to press down. When I come to stop now I have to keep my foot on the break and the gas pedal to insure that it will go when I press the gas pedal.

- Pulaski, TN, USA

problem #11

Oct 182013

Mariner 4-cyl

  • 92,924 miles
The throttle/gas pedal in my 2008 Mercury Mariner kept sticking and eventually breaking. I had the car towed and taken to a repair shop where they inspected the cable unhooked from the pedal when the technician hooked the cable throttle to the pedal it would not move when pressing down on the pedal, the throttle plate stuck. The technician removed and replace the throttle body assembly. I researched online and found that my issue is the same issue that was a Ford escape recall back in July 2012. Is this something I can contact Ford about to see if this should also be part of their throttle cable recall.

- Bothell, WA, USA

problem #10

Sep 012012


  • 82,000 miles
I was driving along the highway and the gas pedal just went to the floor. The engine was still running but I could increase the power. I had to coast across three lanes of high speed traffic in order to get my vehicle safety to the side of the road. This the second time the accelerator cable in this vehicle has snapped without warning. My dealer replaced the first cable last year and just over one year later the same cable has snapped. I was fortunate not to panic and was able to bring my vehicle to the side of the road. This cable snapped twice while I was traveling on the highway. I had no control over my vehicle and could have killed or involved in an accident. My dealer is replacing the cable under my extended warranty but are charging me to replace their defective throttle box. Ford/Mercury needs to recall all Mariners and Ford escapes asap.

- Woburn, MA, USA

problem #9

Mar 092012

Mariner 6-cyl

  • 90,000 miles
Diving along the freeway I had the cruise sent at 65mph and suddenly the Mariner was accelerating on it's own. I step on the brake and it disengaged the cruise and slowed. I actually thought it was a fluke of some kind. Then driving home I didn't use the cruise and the car just slowed down about 15mph while I had my foot on the gas staying at 55mph. I've experienced this loss of power about 6 random times. I've used the cruise on long stretches of highway(that I rarely drive) and the Mariner has accelerated on it's own 4 times. The fourth time resulting in a speeding ticket of 15mph over. This was 1 of 2 times the acceleration was gradual. Otherwise it's as if the gas pedal was to the floorboard as it takes off. I see on the NHTSA that there are others having this same problem. I've questioned this at the dealership and they can't find anything wrong nor recreate the problem and there is nothing from Ford about this problem. As soon as I am working again I will be trading my Ford Mariner in for a different vehicle. Until then I won't use my cruise and hope for the best. This is scary that this happens and Ford doesn't acknowledge it!

- Hartland, WI, USA

problem #8

Dec 272012

Mariner 6-cyl

  • 35,324 miles
Was traveling home for lunch, turning corner and vehicle suddenly went to idle. Pushed gas pedal and it went to the floorboard, but engine remained at idle. Was unable to accelerate at all. Was able to idle home blocking traffic as I went. Checked gas pedal and found that throttle cable had broken. The wire itself had broken. The rubber grommet and crimped end remained in-tacked. This could have been very dangerous if for instance I had been pulling onto freeway or crossing a busy intersection, or in heavy traffic. I believe this part should be inspected on all vehicles of this year and make. This type of breakage could cause an accident and possibly a fatality.

- Stephenville, TX, USA

problem #7

Oct 132012


  • 37,000 miles
The contact owns a 2008 Mercury Mariner. The contact stated that when placing the vehicle into drive, the accelerator pedal could not be depressed all the way down and the vehicle would hesitate. After coasting for a while, the vehicle would rapidly accelerate without warning. The vehicle was not inspected by a dealer or an independent mechanic. The manufacturer was not contacted. The failure mileage was approximately 37,000. The current mileage was approximately 40,000.

- Hampton, VA, USA

problem #6

Nov 152011

Mariner 4-cyl

  • 10,000 miles
Accelerator gas pedal difficult to depress when weather gets cold (below 50F). It requires a harder press to engage and have the car move. It is dangerous when crossing an intersection after a stop. For the failure to work right keeps us in the intersection as we try to move out of the way of oncoming traffic. Having to press harder results in loss of control as we maneuver the car when turning at an intersection. We took the car to the dealer and they added a lubricant. It helped a little, but it was again difficult the next cold front that we had (temperatures below 50F). This condition graduated from the first winter we owned it in 2008 to this winter starting in 2011. It appears that the pedal works better after the car has been operating for a while, like 20 minutes or so.

- Laredo, TX, USA

problem #5

Jun 222010


  • 56,000 miles
In December of 2009 I reported an incidence of unintended acceleration. Since then we have not been using the cruise control much. Yesterday I activated the cruise control at 60mph on a long flat area. There is a mountain pass and curves between that area and our home. I hit the brake and slowed down around the 35 mph curves. On the down grade I took it out of over drive and dropped down a gear. The road flattens out again at the bottom but I did not reengage the cruise control. At one point at an intersection I had to brake to ten miles per hour or less for an oncoming car. Just after making a left turn onto our street the car began rapidly accelerating on its own. I didn't have my foot on the gas pedal. Since the road is straight I allowed it to accelerate to see what it would do. It went from 10 mph to 50 mph before my wife asked, "why are you accelerating? I replied, " I'm not. It's doing it on its own." It disengaged as soon as I hit the brake pedal. There is no way this was caused by a floor mat. I was only going about 10mph when it began accelerating and I took my foot off the pedal. The last time I complained to Ford the car was under warranty and had less than 36,000 miles on it. Ford said they couldn't do anything about it since it was intermittent and they hadn't experienced the problem. Another safety problem we have had with the car: When it had 26,000 miles on it the front end began shaking when braking. Ford said the front rotors were warped and resurfaced them under the warranty. They refused to change the pads or install new rotors. About 15,000 miles later it began vibrating again at speeds above 50mph. Now the vibration is severe. We are looking at a complete brake overhaul. We have never detected the brakes being overheated while the car was being driven. Another problem we had was that the trans cooler went out at 26,000 miles. Ford installed a new one under warranty but refused to drain and replace the transmission fluid.

- Bonanza, OR, USA

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