My 2009 mercury mariner (has 56,000 miles), without any warning, it just shut off while I was driving it. Has happened twice. Was able to get the side of the road and was able to restart it. No warning lights came on at all. Car is at dealership now to have it checked out.
2009 Mercury Mariner engine problems
60 complaints (19% of all complaints for this car). Typical mileage when it fails: 69,000.
- owner complaints
- 60
- of this car's complaints
- 19%
- typical mileage
- 69,000
- crashes
- 0
- recalls
- 0
Which part fails
Owners did not name a specific part.
At what mileage
Complaints by mileage at the time of the problem.
0k-25k
25k-50k
50k-75k
75k-100k
100k-125k
125k-150k
150k-175k
175k-200k
200k+
Mercury Mariner engine problems in other years
Specific symptoms reported on the 2009 Mercury Mariner engine
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Loss of power 42Stalling 35Check engine light 23Engine failure 12
Related recalls
No recalls on record for this model year.
Related investigations
Electronic Throttle Body Malfunction
On February 21, 2013, the Office of Defects Investigations (ODI) opened Preliminary Evaluation PE13-003 to investigate allegations of electronic throttle body (ETB) failures resulting in sudden reduction of engine power in model year (MY) 2009-2013 Ford Escape, Fusion, Mariner and Milan vehicles. During this investigation, Ford identified a condition in subject vehicles equipped with 2.5L and 3.0L engines that may result in a sudden reduction of engine power.According to Ford, the ETB internal motor contacts may develop a high resistance material buildup condition on the commutator, resulting in intermittent electrical connectivity and reduced engine power. When this condition occurs, the Malfunction Indicator Lamp (MIL) or Wrench light will illuminate and the vehicle may enter a limited limp home mode.Ford?s trade name for the feature is Failure Mode Effects Management (FMEM) mode.In this mode, engine power and vehicle speed are reduced, while full function of the power steering, power braking, lighting, and climate control systems are maintained.ODI?s complaint analysis indicate that the predominant failure mode involved reduced motive power associated with the limited limp home mode with engine speeds limited to approximately 900 RPM. Analysis of warranty claims provided by Ford identified 59,807 claims related to ETB replacements and approximately 50 percent of claims are associated with diagnostic trouble codes (DTC) P2111, Throttle Body Stuck Open, and P2112, Throttle Body Stuck Closed.Ford described several factors where the ETB motor may fail resulting in DTCs P2111 or P2112 but the failure is not an existing stuck open or closed ETB valve position.According to Ford, the ETB control strategy provides the driver with three FMEM modes that allow varying degrees of vehicle mobility depending on the severity of the fault detected.DTCs associated with stuck open or closed throttle valves are designated the highest failure severity resulting in engine speeds limited to high idle corresponding to the limited limp home mode.Vehicles are not likely to unexpectedly stall as a result of this condition, but drivers may characterize the reduced functionality as a stall, even though their vehicle may still has motive capability.Other FMEM limp modes may result in reduced engine performance but will maintain vehicle speed above 20mph. During this investigation, Ford and its suppliers, Delphi and Igarashi, updated the powertrain control module (PCM) software to include a throttle body motor cleaning cycle during key-on and modified the ETB internal motor components design, surface finish and material composition to improve durability. Additionally, Ford developed a remedy procedure and issued a special Customer Satisfaction Program (CSP) 13N03 extending the ETB warranty coverage and instructing dealers to update the powertrain calibration to improve vehicle performance in the event that intermittent electrical connectivity of the throttle body motor contacts occurs. The program extends the coverage for up to 10 years of service or 150,000 miles from the warranty start date of the vehicle, all vehicles are eligible for the program through January 31, 2015 regardless of mileage.Owners of the affected vehicles will be contacted by mail to take their vehicle to a Ford dealer who will reprogram the PCM to the latest calibration. The bulletin was sent to dealers on January 17, 2014 and the owner letter mailing began on January 27, 2014. See the investigative file for copies of Ford's bulletin and owner letter. This preliminary evaluation is closed. The closing of this investigation does not constitute a finding that
PE13003
What 2009 Mercury Mariner owners say
Most recent owner complaints, unedited.
Vehicle randomly and suddenly loses power on highway. Dashboard lights up, have to pull off road turn off and wait a short time then resumes normally. Possibly throttle body problem.
While traveling approximately 35 MPH, driving in a straight line on a city street in traffic, the ABS abruptly applied the brakes - hard! The ABS light came on and a "check brake system" warning message was displayed. Also, the electrical system shut down and the engine lost power. After about 5 seconds, power was restored and vehicle was able to proceed. This occurred approximately 8 times over a two mile distance. During the last 4 times, the engine died, lost power completely, and needed to be turned off and restarted to continue. This failure was a dangerous safety hazard. Vehicle was towed to albuquerque lincoln volvo. The problem was diagnosed as a failed ABS module, 9l8z. The dealer replaced the ABS module with a faultly module. A second ABS module was installed and the vehicle was deemed repaired. The dealer did not return the defective part for analysis.
Tool light comes on and car loses power in traffic, very, very dangerous. Dealership updated with computer but vehicle is still doing it. Please do a recall ford.
Mercury mariner (2009) v6 4wd. Has stalled twice. 1. While driving at 35 MPH. It stalled and was able to restart once the vehicle stopped on the side of the road. We took it to a ford dealer and the throttle body was replaced. 2. Stalled when slowing to a stop. This was after the throttle body was replaced on 10/13/2017. Only driven about 500 miles. Both times vehicle was going down a country road.
My truck stalls. I purchased a new battery, and it continues to stall while driving or idling.
Test driving vehicle and I could not accelerate. Dealer said he would fix problem.
My 2009 mercury mariner stalls while its idle, at a intersection or just waiting. It stalls then I started up right after it stalls.
Tl* 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.
Tl* the contact owns a 2009 mercury mariner. The contact stated that while at an intersection making a left turn, the power steering failed. The check engine warning light illuminated. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 125,000. The VIN was not available.
Questions about the 2009 Mercury Mariner engine
Does the 2009 Mercury Mariner have engine problems?
Owners have filed 60 complaints about the engine of the 2009 Mercury Mariner, 19% of all its complaints.
At what mileage do 2009 Mercury Mariner engine problems start?
The typical (median) mileage in owner complaints is 69,000 miles.
Was there a recall on the 2009 Mercury Mariner engine?
There is no recall for this problem on this model year.
What year does the Mercury Mariner have bad engine?
The Mercury Mariner model years with the most engine complaints are 2010 (63 complaints), 2009 (60 complaints) and 2008 (20 complaints).
Other 2009 Mercury Mariner problems
Steering 167Transmission 44Acceleration 41Fuel system 30Electrical 22Brakes 14Wheels 7Driver assistance 6Airbags 4Body 3Suspension 3Lights 2Locks 1Seat belts 1Visibility 1
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