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Transmission and drivetrainPart report

2009 Mercury Mariner Transmission and drivetrain Problems

Complaints
44about this part
Share
14%of 315 total for the year
Median mileage
69,000miles
Trend
RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.

NHTSA recorded 44 complaints about the transmission and drivetrain of the 2009 Mercury Mariner, 14% of the 315 complaints for this model year. Where a mileage was given, the median is 69,000 miles.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I was driving around 40 MPH and a light in my dash the symbol of a wrench appeared ,then my SUV I lost power going forward , it seemed the engine shut down , I was able to get off the road in very bad traffic with out getting into an accident . The traffic was very heavy and the SUV was very hard to control with out power.”

NHTSA complaint #11063886, filed 2018-01, 105,000 miles

“Driving my 2009 Mariner premier about 35/45 MPH when wrench symbol comes on indicating throttle control powertrain / transmission problem car is not accelerating properly and transmission is jerking when I step on the gas pedal and the car shakes vibrates and feels under powered. Got home and parked it. Started it up and now check engine light is also on. Is this covered by the recall for extended warranty from ford ?”

NHTSA complaint #11053592, filed 2017-12, 94,700 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.”

NHTSA complaint #10495256, filed 2013-01, 59,995 miles

“Car had problems with lagging during acceleration. I was driving to the bank and the car completely stopped responding to the gas pedal.a wrench light popped up as well as check engine light. Had to pull over because my car would no longer accelerate and quickly stopped moving. I was told by mechanic it was the throttle body.”

NHTSA complaint #10553990, filed 2013-11, 95,000 miles

“While driving the auto just stopped and the check engine light came on and stayed on. I turned the auto off and restarted. It did this three times before I arrived back home. Took it to have a diagnostic test on the engine and code p2111 - throttle actuator stock open was the results. This is the second time this happened. The first time was 2 or 3 months ago but the check engine light did not come one.”

NHTSA complaint #10586910, filed 2014-05, 69,000 miles

Related service bulletins

Transmission and drivetrain: other model years

YearComplaintsShare of year
20112428%
20106022%
20094414%
20086614%
20071133%
20061117%
20051522%

Other parts of the 2009 Mercury Mariner

Steering
167 complaintsEngine
53 complaintsVehicle speed control
41 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