2009 Mercury Mariner engine NHTSA complaints: Vehicle Speed Control

NHTSA — Vehicle Speed Control Problems

2009 Mercury Mariner (Page 1 of 2)


really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
69,018 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.

2009 Mercury Mariner engine problems

engine problem

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2009 Mercury Mariner Owner Comments (Page 1 of 2)

problem #38

Jan 102016


  • 70,000 miles


My 2009 Mercury Mariner stalls while its idle, at a intersection or just waiting. It stalls then I started up right after it stalls.

- North Bergen, NJ, USA

problem #37

Feb 032016


  • 89,000 miles
The contact owns a 2009 Mercury Mariner. The contact stated that while driving approximately 25 mph, the vehicle hesitated and lunged forward as the engine warning indicator illuminated. The contact powered the vehicle off and back on and drove the vehicle without incident, however, the failure recurred approximately two weeks later. The contact powered the vehicle off and back on, however, the vehicle failed to accelerate. The vehicle was towed to an independent mechanic and was diagnosed that the throttle actuator needed to be replaced. The vehicle was repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 89,000.

- Cincinnati, OH, USA

problem #36

Jul 172014

Mariner 4-cyl

  • 132,256 miles
I was driving at 45mph when all of a sudden, the car stop running. I had to pull over and cut the car off. I started the car again and it went about one mile before it cut off again. Then a wrench symbol came on the left side dash board. I drove the car home and it cut off on me three times before I could get it home. I look in my car book to see what the wrench symbol means and it says that it is the throttle control/powertrain.

- Winston-Salem, NC, USA

problem #35

May 012014

Mariner 6-cyl

  • 62,854 miles


While I was driving on hwy doing 75mph my Mercury Mariner 2009 it suddenly loss power and (while engine was running) I could not accelerate. "tool" light came on. I could not do anything to regain speed (accelerator was disable) and the only fix was to shut down the engine and re-start. Vehicle will start and work normally I took to the mechanics the next day he said that no codes came up.

- Raleigh, NC, USA

problem #34

May 042012

Mariner 6-cyl

  • 38,000 miles
The vehicle suddenly accelerated and then slowed down rapidly. Pulled over and put car in park and turned it off. Called my uncle who is a mechanic and was not to sure as to what could have happened since he was not there. Started car and revved the engine to see if anything unsafe happened. Car seemed ok and was able to drive it home. Mechanic looked at it the next day but could not find anything wrong he said or duplicate the problem.

- Vernon Hills , IL, USA

problem #33

Mar 162014


  • 59,000 miles
Driving on highway with speed control on at 75 mph, all of the sudden vehicle rapidly sped up to 95 mph. The vehicle just took off raving engine up. Applied brakes and took off cruise control. If there had been traffic this could of been a dangerous or deadly incident. We have had the vehicle in before for the same problem, it would speed up while making a turn. Ford dealership said it was a transmission problem. All repairs have been done by a Ford dealership.

- Lawrenceburg, IN, USA

problem #32

Oct 172013

Mariner 6-cyl Diesel

  • 117,605 miles


Driving home from work the car went into "limp mode", pulled over to side of road, called for tow and had car taken to shop for diagnostics and repair. Shop determined it was faulty throttle body ( there were over 700,000 orders for replacements on website at this time)part was on backorder---came in, was replaced and I paid the bill of $720.60 for parts, labor, towing and taxes. I got letter from Ford that part is now a recall item so I take the bill to kerry Ford in cincinnati, oh and they take all of my info and send me a check for $167.85 and tell me too bad for not having work done at Ford store, that's all I am going to get. This does not even cover the cost of the part alone. So as a stranded motorist, I was supposed to think of a Ford dealership first instead of safety first and getting my car repaired.

- Lawrenceburg, IN, USA

problem #31

Jul 282011

Mariner 6-cyl

  • 33,000 miles
The vehicle suddenly looses power and accelerator is unresponsive. This first occurred with approximately 33,000 miles while still in warranty and dealer replaced throttle body. Vehicle was fine until November of 2013 with about 80,000 miles. This is very dangerous because vehicle goes down to idle speed and with no power, it's very hard sometimes to get to the shoulder of the road with only coast control of vehicle. This should be a recall issue as I'm aware of the many others having same problem. I'm making this complaint to try and have this issue resolved before something tragic happens and also to document this safety issue.

- Denham Springs, LA, USA

problem #30

Dec 312013

Mariner 4-cyl

  • 70,000 miles
Car engine stopped while driving at a low (10-20 mph) speed. Second time this happened. First time on 2011 replaced throttle body then. It happened again 12/31/2013. Ford service said throttle body needs to be replaced again.

- Irvington, NY, USA

problem #29

Dec 072013


  • 60,000 miles
When pulling up to a stop sign the car just stopped next time coming off interstate to stop the vehicle kinda of lunged the next tine it just tried to stall had to put in neutral and keep foot on gas to keep it running.

- Franklin, OH, USA

problem #28

Dec 262013

Mariner 4-cyl

  • 94,000 miles


While driving the Mariner at 45 mph on a busy street, the engine went into limp mode, lost all acceleration and slowed to 5 mph. I was nearly rear-ended by the truck behind me and was forced to pull up onto a sidewalk, damaging my tire. Pulled the codes on the car and got a P111 code. Did some searching on the internet and found that this is a common issue and an extreme safety hazard. I was very happy that I was the driver, and not my 16 year old daughter!!! this is the second safety issue we have had with this car in the last month -- earlier the power steering went out, again without any warning in traffic.

- Ocala, FL, USA

problem #27

Nov 082013


  • 109,500 miles
Traveling along with cruise control set at 65 when all of a sudden my vehicle decelerates. The "throttle body/throttle position switch" indicator light illuminated. Vehicle has had intermittently gone into "limp" since then. Lately it has happened at least once per day, often when trying to accelerate quickly or above 40mph. Check engine light illuminated yesterday (11/26/2013) and indicated a P2111 diagnostic code (throttle actuator stuck open). This is apparently a fairly common issue already under investigation. The solution seems to be have a dealer replace the throttle body (roughly $400 parts and labor).

- Little Rock, AR, USA

problem #26

Nov 062013


  • 68,000 miles
I was driving on the highway and suddenly the vehicle lost all speed control. I could not accelerate and the car began slowing down. I had to quickly change lanes and pull over to the shoulder. I put the car in park and turned off the engine, waited a few minutes, and then was able to start the car again. This same thing happened two days later. I have read other complaints about this same issue happening with Mariners between 2009-2011. This needs to be recalled and fixed. It is incredibly dangerous to lose all acceleration control going 65 mph!!

- Houston, TX, USA

problem #25

Oct 292013


  • 71,000 miles
During normal highway driving conditions, car suddenly stopped accelerating, could push the accelerator all the way to the floor and get no power. Engine did not stall out, but would not provide power. Was able to pull over and turn off car, then turn back on, and problem was gone. After another 15 miles or so it happened again. Took the car to the dealership and they reported that it was a bad throttle body and had to be replaced.

- Winston-Salem, NC, USA

problem #24

Oct 222013


  • 101,567 miles
Car lost power and stopped while driving. Engine light came on then went off.

- Antioch , TN, USA

problem #23

Oct 072013

Mariner 6-cyl

  • 97,000 miles
While driving on the taconic state parkway, traveling at approx. 55 mph, the engine failed to respond to the throttle and while the car was still in gear, the vehicle merely began coasting. I safely steered the car to the shoulder of the road, and turned the vehicle off. After approximately 2 minutes, I was able to re-start the car (with some hesitation). I then turned around to attempt to drive home. The same situation occurred one more time while traveling home (approx. 30 miles). I brought the car to metric motors of lake carmel, NY. Their computer diagnostics identified the problem as the throttle actuator control. They said that they unstuck the part (cost to diagnose & make repairs $422+) and I again began driving the car. Unfortunately, after visiting nyc on Saturday, October 19, 2013, the same problem occurred, again while driving home on the taconic state parkway. I was able to start the car; however, the problem re-occurred approximately 10 more times over the 40 mile return trip to my home. Each time the engine failed to respond to the throttle and while stile in gear, merely began coasting. Each time, I safely steered the car to the shoulder, and eventually re-started the car and managed to make it home.

- Patterson, NY, USA

problem #22

Oct 182013

Mariner 4-cyl Diesel

  • miles
Turned the vehicle on, drove to end of street wrench aka check engine light appeared just at the same time I came to a stop vehicle started to shack and idle rough and then rpms stared going out of normal range with out a stable position. And then vehicle died twice while making it back to house where I hooked up my obd2 code reader and stated the it was a P2111 code and stated:"throttle actuator control system stuck open".

- Fort Drum, NY, USA

problem #21

Feb 182013

Mariner 6-cyl

  • 59,551 miles
Engine died while driving with engine and wrench light coming on. Took to dealer and found dtc code P2111 when troubleshooting. Dealer found internal fault with throttle body. Replaced throttle body and have not had problem since.

- Pensacola, FL, USA

problem #20

Aug 292013

Mariner 6-cyl

  • 84,000 miles
Upon accelerating, vehicle stalled. Occurred on Aug 29 and again on Sept 4. had to glide to a stop on highway shoulder, put car in park, turn off, and restart. I've had intermittent issues for a while where car doesn't accelerate when pushing on the accelerator, then it lurches forward. Ford dealership said it was throttle body and repaired it. Upon looking online, this seems to be an ongoing issue with certain escapes and Mariners.

- Alpharetta, GA, USA

problem #19

Sep 052013


  • 101,000 miles
While driving approximately 35 mph, the vehicle lost all throttle. The engine continued to run. Pulled over and placed the vehicle in park. Pressed on accelerator but nothing happened. It would not rev the engine. Restarted the vehicle and the throttle worked properly. This happened twice today.

- Crown Point, IN, USA

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