2009 Mercury Mariner Vehicle speed control Problems
- Complaints
- 41about this part
- Share
- 13%of 315 total for the year
- Median mileage
- 70,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 41 complaints about the vehicle speed control of the 2009 Mercury Mariner, 13% of the 315 complaints for this model year. Where a mileage was given, the median is 70,000 miles. 1 of these say a crash was involved, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“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.”
NHTSA complaint #10586997, filed 2014-05, 62,854 miles“While I was driving the car jerked as if I hit my brakes and it wouldn't let me accelerate anymore so I pulled over on the side of the road and the car was vibrating real rough so I turned the car off and sat there for a minute and tried starting it and it took a couple tries and I got down the road and pulled into where I was going and it did it again as I was pulling into a parking spot. …”
NHTSA complaint #10515978, filed 2013-06, 32,000 miles“Driving up ramp to get on 95 car started slowing down after I gave it gas to get up ramp. I noticed a wrench light illuminated on dash so I pulled of manual after turning off car to see what it meant (throttle) I sat for 5 fives started the car and it drove fine, but since then it has happen 3 more times.”
NHTSA complaint #10519504, filed 2013-06, 33,800 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.”
NHTSA complaint #10611341, filed 2014-07, 132,256 miles“I am getting continual throttle body errors on my 2009 Mariner. It goes into low power mode so I can limp home . It happens mostly on highways when I need to punch it and get alot of acceleration.”
NHTSA complaint #11024080, filed 2017-09, 122,680 milesVehicle speed control: other model years
Other parts of the 2009 Mercury Mariner
167 complaintsEngine
53 complaintsTransmission and drivetrain
44 complaintsFuel system
30 complaintsElectrical system
22 complaintsOther or unknown
15 complaintsBrakes
14 complaintsEngine cooling
7 complaintsWheels
7 complaintsAir bags
4 complaintsElectronic stability control
4 complaintsBody and structure
3 complaints
← All problems reported for the 2009 Mercury Mariner
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology