2009 Mercury Mariner drivetrain NHTSA complaints: Power Train

NHTSA — Power Train Problems

2009 Mercury Mariner (Page 2 of 2)


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
66,426 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 drivetrain problems

drivetrain problem

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2009 Mercury Mariner Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #17

Aug 272013

Mariner 6-cyl

  • 59,500 miles


This actually first occurred on Friday. I was traveling on the thruway at about 65mph when the car felt almost like it downshifted and then I totally lost acceleration and the wrench light appeared on the dash. I limped to the side of the road and the car jerked and sputtered before I shut it off. After a few minutes I restarted the vehicle and it sounded like it was flooded at first then it turned over normally. I was an hour from home and made it back without further incident. I took it to the dealer the next morning and it did not show any codes. They suggested I replace the purge valve, and as I had a busy week of work related travel scheduled I went ahead and had them do it for $120. Better safe than sorry. Right? today I get an hour from home and it happens again. I call my dealer and they suggest I find the closest Ford dealer and take it there immediately. Closest Ford dealer couldn't take me for 2 weeks!! I was an hour from my destination, so I decided to chance it. I drove about 20 minutes and it happened again. Same exact scenario. I started it again, got back on the road and drove 10 minutes and again, except this time the engine light also came on. I called roadside assistance and was towed to a garage. I am 2 1/2 hours from home and driving a rental. Garage will diagnose and hopefully fix tomorrow. Service tech said if he had to diagnose without a code he would say throttle body! it also sounds like this is not covered by my 5 year/60K warranty either. With all of the similar stories I have read online Ford needs to be forced to do a recall and reimburse us all for our expenses.

- Equinunk, PA, USA

problem #16

Aug 272013

Mariner 6-cyl

  • 39,230 miles
The first sign of a problem with my 2009 Mercury Mariner (39,000 miles) was three days ago when it stalled at a stop light. Today was a bit more dramatic. At 70 mph in heavy traffic the vehicle RPM suddenly dropped down to 900 and the accelerator was none responsive. Fortunately, I was able to coast across several lanes onto the shoulder of the road. As I slowed to a stop the vehicle began surging and bucking. I noticed the wrench light was on. Then I turned off the vehicle. It restarted fine a few minutes later and ran normally (no warning lights) over to the Ford dealership. After listening to my story, the Ford service man told me that he was nearly certain the throttle body needed replacement. He went on to say that he was quite familiar with the issue since for years he's been dealing with - on average - three of these cases per week. That's one service man at one dealership. Do the math! I asked if there was a recall or if Ford would give me a break on the repair. He said "no", but agreed that the throttle body should not fail after only 39,000 miles. He also said it would be a waste of time filing a complaint to Ford customer service. So, I took the vehicle to my local mechanic to have it checked out. They found no error codes registered and for their test drive it ran fine. I don't know what to do next. By the way, there was an earlier recall for our vehicle. In September 2010, they reprogrammed the powertrain control module and replaced the plm, whatever that means.

- Sugar Land, TX, USA

problem #15

Aug 262013

Mariner 6-cyl

  • 90,000 miles
2009 Mercury Mariner with about 90,000 miles. Was on the freeway driving about 65-70 mph when suddenly the power to car cut off - was not able to accelerate vehicle; drove to right side of the road. Car was still on, but gas pedal would not work, wrench light was on, car idling very roughly. Turned car off. Turned car back on, wrench light was off, drove another 30 minutes to destination without incident. In the two hour drive home, the car cut off five more times. I heard a bell alert audio sound a few times, but the only light that came on was the wrench just as the power cut off. The very last time it happened, the engine light came on, and stayed on even after restarting the car. I feel very thankful to have got home alive and without getting into an accident. Dealer recommends a 90M service package ($547), a diagnostic test ($104), and possibly a throttle body and/or sensor ($300-ish).

- Charlotte, NC, USA

problem #14

Aug 082013

Mariner 6-cyl

  • 45,300 miles


Driving along and unexpectedly engine goes in limp mode with no warning and no acceleration- extremely dangerous as was driving on expressway when this occurred.

- Philadelphia, PA, USA

problem #13

Jul 252013


  • 95,346 miles
On expressway, my vehicle went into lim home mode. It continually did this, so I had my vehicle towed to the auto shop. The mechanic said that this is a common problem with my year vehicle and you folks are looking into this issue. Hopefully you will recall it.

- Port Huron, MI, USA

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problem #12

Jun 192013


  • 92,000 miles
Car suddenly started to loose power and reduce speed to about 20 mph. Then idled very, very rough - close to shutting down. Sat for a while restarted it up and could not get it past 20 mph. Ended up taking it to dealer next day and they looked into it. Took apart the throttle actuator and cleaned it. Worked fine for about a month, but today experienced the same problem. Had to have it towed to repair shop and we are still trying to figure out what to do about it.

- Elgin, IL, USA

problem #11

Jul 082012

Mariner 6-cyl

  • 58,000 miles


Driving along at 40 mph and the vehicle started slowing down. Giving it more gas had no impact. I noticed a wrench light illuminated on dash. After sitting for a few minutes the vehicle was restarted and ran fine. This happened again a few weeks later so we brought it to our repair shop. After some research it appeared that others had the same issue and that replacing the throttle body may be the issue. The part was replaced and we didn't have the issue for months until it happened again. It's been a total of 5 times it has happened. Really worried that this will happen on the highway where there is higher risk of an accident. Not sure what to do next. Sure seems like many others have this issue. Does Ford have a solution for this?? if they do they should issue a recall before someone is hurt badly.

- North Brookfield, MA, USA

problem #10

Jan 212013


  • 29,000 miles
I was leaving work and driving down a road at about 50mph when all of a sudden my car jumped and I then was coming up to a red light so I was braking and behind a car. At the red light I was a few inches from hitting the car because my car kept jumping forward. I then got scared and turned my car off and back on and it was driving fine. Then all of a sudden it did the same thing and I couldn't accelerate I would press on the gas and my car was just shaking and losing speed and wouldn't move. Thankfully I didn't drive the highway home that day.

- Tampa, FL, USA

problem #9

Jan 052010

Mariner 6-cyl

  • 18,588 miles
Update to 01/30/13 complaint. I purchased car on 10/22/12 with 58,398 miles from a dealer. I started having issues late December 2012. I was having problem with car jerking into gear or being sluggish when accelerating. I took car to dealer on 01/29/13. Researched carfax information and found out that on 01/05/10 - transmission flushed and stated as replaced. 18,588 miles. 08/09/10 - transmission was removed to replace cooler. 28,372 miles. On 01/29/13 mechanic advised that transmission was leaking badly and that "press regulator valve sticking". 01/30/13 - transmission valve body replaced. 63,356 miles. 6 weeks after valve body replaced car started jerking again. Took car to dealer on 03/18/13...dealer suggested replacement of transmission, but extended warranty company said no...would only pay for transmission rebuild. 65,951 miles. This entailed day and half of dealer/warranty company haggling over repairs. Mechanic began work on 03/21/13 and found lots of melted plastic that he had to remove. Transmission work completed on 03/23/13 but repair revealed starter problem. Dealer currently waiting on approval from warranty company to repair starter. Mechanic advised if starter not repaired will cause fly wheel problem. Mechanic is annoyed that transmission is having problems so soon after 2010 "repairs" and that warranty company refused to replace transmission.

- Arlington, TX, USA

problem #8

Jun 032012

Mariner 6-cyl

  • 35,000 miles
While entering interstate highway, engine balked like bad gas. After two or three tankfuls and the vehicle dying in traffic, I left it with my dealer to find the problem. After a week, the vehicle had not died for them so I brought it home, only to continue with the same dying and hesitating when accelerated. A month or so later the dealer kept it again for about 5 days and it still did okay for them. They have no idea what the "problem" is. We have parked the car in our garage because several times we have narrowly escaped being rear-ended, when turning corners, crossing railroad tracks, etc. I contacted Ford Motor Co. In Michigan and they do not "have this problem with other vehicles" and don't seem to know what I'm talking about. Mechanics in two other garages have driven the vehicle and have not located the problem. Help!!

- Bedford, IN, USA

problem #7

Feb 212013


  • 80,500 miles


I was driving through a town and the car cut out and lost all power. I steered it off the road safety. It restarted just fine and I took off again going four blocks were it died instantly in the middle of the road. It is now in the shop to figure out what caused stalling in the car, and then allowing it to restart and continue down the road. Very unsafe with traffic behind me and oncoming to be stalled on a curve on the road.

- Plainville, IL, USA

problem #6

Jan 222013


  • 99,000 miles
As my daughter was driving on the freeway, the engine suddenly lost power and she had to work her way to the side across 3 lanes of heavy traffic with no power. Our mechanic replaced the throttle body at our expense. The news today indicated that you were investigating the circuit board which controls the throttle and we wanted you to know that this problem was a threat to her safety and appears to be occurring to many people. This was the fourth time the vehicle has stopped while driving.

- Lakewood, WA, USA

problem #5

Dec 052012

Mariner 6-cyl

  • 59,995 miles
After coming to a stop at a light or stop sign, as I accelerate my car jumps/jerks as if it's straining to switch to next gear. Generally happens when accelerating between 10-40 miles. When it initially started it would happen 1-2 times a week. Now it happens every day. I have an appointment schedule to have dealer look at vehicle.

- Arlington, TX, USA

problem #4

Dec 072012


  • 76,000 miles
The contact owns a 2009 Mercury Mariner. The contact stated that while driving 65 mph, there was a noise heard from the engine. The vehicle was taken to a mechanic who inspected the vehicle and discovered that there was no transmission fluid in the required reservoir. The mechanic informed the contact that the seal from the transmission was leaking fuel and referred her to a transmission specialist. The vehicle was then taken to the transmission specialist who informed her that they needed to do an overhaul and rebuild the transmission. The vehicle was scheduled for repairs. The manufacturer was notified of the failure who advised the contact that there was a technical service bulletin for the failure (NHTSA item number: 10039137: Power train: Automatic transmission) but no recalls. No further assistance was offered. The failure mileage was 76,000.

- Carle Place, NY, USA

problem #3

Apr 232012


  • 38,000 miles
My vehicle started leaking fluorescent oil from behind the radiator. Apparently, it's the condenser. I have been told that the radiator lines run through the same system, and that if it is not repaired my transmission will eventually fail. This failure was explained to be the transmission locking up, and they said if I'm going over about 30 mph it will be very dangerous. I am about 2,000 miles out of warranty, and the emails I have sent to Ford only get a response that they will be happy to take my money and fix it. Within a few months of buying it, the intake manifold had to be removed to repair something. Then, a transmission solenoid. Then, it was shifting funny -because it had very little fluid-noone could explain why. The vibration in the gas pedal at 42 mph "could not be verified. " the manufacturer was apparently out of satellite receivers, so they just didn't put one in...the lack of quality overall proves that the length of the warranty is to prevent them from costly fixes...and my "long term investment " makes me feel like I'm putting mine and my family's health at risk by driving it. I spent every dime I saved in iraq on this pos because I knew I wouldn't be able to afford another vehicle until I'm out of medical school.

- Indianapolis , IN, USA

problem #2

Sep 082011


  • 59,000 miles
The contact owns a 2009 Mercury Mariner. The contact stated that the transmission would shift hard when up shifting or downshifting. The contact took the vehicle to the dealer and was told that there was nothing wrong with the transmission, but that the power train control module needed to be reprogrammed. The vehicle was repaired. The failure mileage was 59,000 and the current mileage was 78,000.

- Brighten , MI, USA

problem #1

Jan 052011


  • 21,000 miles
On multiple occasions starting in Jan 2011, the vehicle would hesitate to select a gear and accelerate while trying to leave a stop light or sign, or after making a turn leaving a few second lull where the vehicle is unresponsive. The previous transmission software re-flash was performed again even though dealer was unable to replicate problem. Issue still persists occasionally, as well as a new symptom since March (23,000 miles). Now, sometimes when coming to a stop the vehicle will stall as though the transmission did not downshift to a lower gear. Placing the vehicle in neutral and restarting allows continued operation. These issues combined with inconsistency in shifting performance as noted by many others lead me to believe there is still a component and/or software problem with this 6F35 transmission. However, since the problem cannot be consistently replicated by the dealer they are unsure of a remedy.

- Garland, TX, USA

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