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2009 Mercury Mariner

Owner reports · Recalls · Investigations

More warning signs than most Mariner years

Owner complaints for the 2009 Mercury Mariner are substantially higher than the model-year median of 63.

About this comparison →

When problems were reported

Mileage at the reported incident

251 reports with mileage · 64 unknown

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Steering. Review the 167 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Engine. Review the 53 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 44 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

9 crash reports0 fire reports3 injury reports

Vehicle Speed Control complaints

41 reports
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59,551 miles · Sep 9, 2013
EngineVehicle Speed Control

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. *TR

NHTSA ODI #10542640

84,000 miles · Sep 5, 2013
Vehicle Speed Control

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 …

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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. *JB

NHTSA ODI #10542151

101,000 miles · Sep 5, 2013
Fuel System, GasolineVehicle Speed Control

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. *JB

NHTSA ODI #10542139

92,912 miles · Aug 24, 2013
EngineVehicle Speed Control

I WAS ON A HIGH TRAFFIC FREEWAY COMING HOME FROM A MATERNITY APPOINTMENT (I WAS 7MONTHS PREGNANT AND IT WAS HOT) AND GOING 70MPH MIDDLE LANE. WHEN MY CAR JUST CUT OFF. I WAS STILL MOVING BUT MY DASH WAS OFF CHECK ENGINE LIGHT CAME ON AND I PULLED TO THE SIDE. I COULD GET IT STARTED BACK UP BUT IT WENT OFF AGAIN. I FINALLY GOT OF…

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I WAS ON A HIGH TRAFFIC FREEWAY COMING HOME FROM A MATERNITY APPOINTMENT (I WAS 7MONTHS PREGNANT AND IT WAS HOT) AND GOING 70MPH MIDDLE LANE. WHEN MY CAR JUST CUT OFF. I WAS STILL MOVING BUT MY DASH WAS OFF CHECK ENGINE LIGHT CAME ON AND I PULLED TO THE SIDE. I COULD GET IT STARTED BACK UP BUT IT WENT OFF AGAIN. I FINALLY GOT OFF ON A RAMP. I HAD TO HAVE MY CAR TOWED AND RENT A CAR. BETWEEN THE TOW RENTAL AND WORK ON MY CAR THE TOTAL WAS (EST 1400). THEN A YEAR LATER IT BEGAN EVERY NOW AND THEN STALLING OR SURGING WHILE I WAS DRIVING. IT HAS PROGRESSIVELY WORSEN. NOW IT HAS BEEN WHEN I STOP OR LET OFF THE GAS IT GOES DEAD. RECENTLY WENT TO AN AUTO SHOP AND THEY HOOKED IT TO THE COMPUTER. IT SAID IT WAS MY THROTTLE BODY. IT WAS CLEANED AND ALL WAS FINE FOR A WEEK. AND NOW IT IS DOING IT AGAIN. I FINALLY DID GOOGLE THROTTLE BODY AND MERCURY MARINER.I FOUND OTHER COMPLAINTS. *TR

NHTSA ODI #10537040

65,000 miles · Aug 23, 2013
Fuel System, GasolineVehicle Speed Control

RECENTLY PURCHASED 2009 MERCURY MARINER (FORD ESCAPE) HAS THREE TIMES SIMPLY QUIT WHILE DRIVING AT LOW SPEED AND THE THROTTLE IS GENTLY PRESSED. LATEST INCIDENT WAS WHILE TRAVELING UPHILL WITH TWO GRANDCHILDREN AND A 18 WHEEL TRUCK ON THE BACK BUMPER. LUCKILY MY WIFE HAD THE PRESENCE OF MIND TO SHIFT TO NEUTRAL, RE-START THE E…

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RECENTLY PURCHASED 2009 MERCURY MARINER (FORD ESCAPE) HAS THREE TIMES SIMPLY QUIT WHILE DRIVING AT LOW SPEED AND THE THROTTLE IS GENTLY PRESSED. LATEST INCIDENT WAS WHILE TRAVELING UPHILL WITH TWO GRANDCHILDREN AND A 18 WHEEL TRUCK ON THE BACK BUMPER. LUCKILY MY WIFE HAD THE PRESENCE OF MIND TO SHIFT TO NEUTRAL, RE-START THE ENGINE, AND ACCELERATE AWAY FROM THE TRUCK. NO ERROR CODES HAVE BEEN SET DURING THESE THREE EVENTS. *TR

NHTSA ODI #10536868

45,300 miles · Aug 8, 2013
Fuel System, GasolinePower TrainVehicle Speed Control

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. *TR

NHTSA ODI #10534359

54,000 miles · Jul 31, 2013
Fuel System, GasolineVehicle Speed Control

DRIVING AT HIGHWAY SPEEDS WHEN THE VEHICLE LOST ALL POWER. WAS ABLE TO THE VEHICLES MOMENTUM TO PULL TO THE SIDE OF THE HIGHWAY. AFTER TURNING THE CAR OFF, WAITING, RESTARTING THE VEHICLE, I WAS ABLE TO RESTORE POWER TO THE ENGINE TO RETURN HOME. TURNING LEFT THROUGH CROSS TRAFFIC, THE VEHICLE LOST POWER AGAIN. WAS ABLE TO QUICK…

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DRIVING AT HIGHWAY SPEEDS WHEN THE VEHICLE LOST ALL POWER. WAS ABLE TO THE VEHICLES MOMENTUM TO PULL TO THE SIDE OF THE HIGHWAY. AFTER TURNING THE CAR OFF, WAITING, RESTARTING THE VEHICLE, I WAS ABLE TO RESTORE POWER TO THE ENGINE TO RETURN HOME. TURNING LEFT THROUGH CROSS TRAFFIC, THE VEHICLE LOST POWER AGAIN. WAS ABLE TO QUICKLY TURN THE VEHICLE OFF THEN ON AGAIN TO RESTORE POWER AND MOVE OUT OF THE WAY OF ONCOMING TRAFFIC. THE DEALER DIAGNOSED AND REPLACED THE THROTTLE BODY FOR BEING DEFECTIVE. THE VEHICLE IS NO LONGER UNDER WARRANTY AND I WAS REQUIRED TO PAY. THIS IS THE SECOND TIME THIS PROBLEM HAS HAPPENED. 1.5 YEARS AGO THE SAME PROBLEM HAPPENED AND THE THROTTLE BODY WAS REPLACED UNDER WARRANTY. *TR

NHTSA ODI #10532803

50,000 miles · Jul 30, 2013
EngineVehicle Speed Control

ABOUT FOUR WEEKS AGO I HAD NOTICED THAT THE GAS PEDAL OF MY CAR WAS ACTING STRANGELY; OCCASIONALLY, AS I WAS TRYING TO ACCELERATE FROM A STOPPED POSITION IT WOULDN'T WORK, OR "CATCH," RIGHT AWAY, AND I WOULD HAVE TO PUSH DOWN INCREASINGLY HARD UNTIL IT MOVED. I HAD AN APPOINTMENT AT MY LOCAL DEALERSHIP WHEN I WAS DRIVING HOME ON…

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ABOUT FOUR WEEKS AGO I HAD NOTICED THAT THE GAS PEDAL OF MY CAR WAS ACTING STRANGELY; OCCASIONALLY, AS I WAS TRYING TO ACCELERATE FROM A STOPPED POSITION IT WOULDN'T WORK, OR "CATCH," RIGHT AWAY, AND I WOULD HAVE TO PUSH DOWN INCREASINGLY HARD UNTIL IT MOVED. I HAD AN APPOINTMENT AT MY LOCAL DEALERSHIP WHEN I WAS DRIVING HOME ONE FRIDAY, STOPPED AT A STOP LIGHT TO TURN LEFT, AND IT STALLED. I BROUGHT IT IN THE FOLLOWING MONDAY MORNING AND AFTER A COUPLE HOURS THE SERVICE ADVISOR AND TECHNICIAN TOLD ME I NEEDED A NEW THROTTLE BODY. THEY TESTED IT AND SAID THEY COULD SEE IT "STICKING." HOWEVER, AND THIS IS WHERE MY COMPLAINT COMES IN, THEY TOLD ME A NEW PART WOULDN'T COME IN RIGHT AWAY AS IT WAS ON BACKORDER AND THERE WERE 48,000 ORDERS BESIDES MINE! IT HAS SINCE BEEN 3 WEEKS SINCE THAT VISIT WITH NO NEW PART AND NO EXPECTED DATE, AND THE SERVICE ADVISOR TOLD ME TODAY WHEN I CALLED THAT THERE WERE CLOSE TO 750,000 ORDERS FOR THIS THROTTLE BODY BECAUSE IT'S THE SAME PART USED IN MANY DIFFERENT VEHICLE MAKE AND MODELS. REGARDLESS, MY CAR IS PROGRESSIVELY GETTING WORSE. WHEN I PUSH THE GAS PEDAL I MORE FREQUENTLY GET NO ACTION AND AT TIMES IT NOW ALSO ACCELERATES UNNATURALLY FAST, ALMOST JUMPS, THEN QUICKLY RETURNS TO NORMAL. YESTERDAY THE PEDAL REQUIRED SO MUCH FORCE BEFORE THE CAR MOVED THAT I THOUGHT IT HAD STALLED ON ME AGAIN, ONLY THIS TIME WHILE I WAS DRIVING IT. THE DEALERSHIP HAS TOLD ME THAT THEY HAVE NO IDEA WHEN THE PART COULD COME IN AND CANNOT GIVE ME A LOANER CAR FOR AN UNLIMITED AMOUNT OF TIME, SO UNTIL THEN I AM DRIVING AROUND IN UNRELIABLE VEHICLE, NEVER QUITE SURE HOW IT'S GOING TO ACT. IT INFURIATES ME THAT THERE ARE SO MANY OF THESE PARTS ON BACK ORDER, AND YET A RECALL WAS NEVER ISSUED. HAD THERE BEEN A RECALL WHEN THE OTHER THOUSANDS OF PEOPLE HAD ISSUES I WOULD NOT HAVE TO SIT AROUND WAITING, WHILE FEELING LIKE I'M PUTTING MY OWN LIFE IN DANGER. *TR

NHTSA ODI #10532734

35,400 miles · Jul 27, 2013
EngineFuel System, GasolineVehicle Speed Control

WAS DRIVING DOWN COUNTRY ROAD AND ALL OF A SUDDEN FELT THEN ENGINE WHAT I THOUGHT WAS KICK OUT OF GEAR. HAD NO ACCELERATION AT ALL. PULLED OFF ROAD AND THE VEHICLE WAS RUNNING IN A ROUGH IDLE, BUT STILL COULD NOT GIVE IT GAS. ONCE PLACED IN PARK THE IDLE LEVELED OUT AND STILL NO ACCELERATION. THE WRENCH SYMBOL WAS ON. I STOPPED …

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WAS DRIVING DOWN COUNTRY ROAD AND ALL OF A SUDDEN FELT THEN ENGINE WHAT I THOUGHT WAS KICK OUT OF GEAR. HAD NO ACCELERATION AT ALL. PULLED OFF ROAD AND THE VEHICLE WAS RUNNING IN A ROUGH IDLE, BUT STILL COULD NOT GIVE IT GAS. ONCE PLACED IN PARK THE IDLE LEVELED OUT AND STILL NO ACCELERATION. THE WRENCH SYMBOL WAS ON. I STOPPED THE ENGINE AND WAITED 10 MINUTES THEN RESTARTED ENGINE AND EVERYTHING WAS OK. FOR ABOUT 3 MONTHS. I TOOK INTO THE FORD DEALER ONLY TO BE TOLD THERE WAS NO CODE AND THEY COULD DO NOTHING WITHOUT IT. PROBLEM HAS GOTTEN STEADILY WORST. AND NOW IT IS AT POINT WHERE WIFE CAN NOT DRIVE HER CAR! I AM DRIVING IT AND FINALLY YESTERDAY THE ENGINE LIGHT CAME ON. I RAN IT TO AUTOZONE WHERE THEY CONFIRMED THE DREADED P2112 CODE. I TOOK IT TO THE FORD DEALER TODAY FIGURING ALRIGHT LESS THAN 5 YEARS OLD AND 42,000 MILES I WOULD FINALLY GET IT FIXED. NO GO! ALTHOUGH FOR $106 THEY DID CONFIRM WHAT AUTOZONE ALREADY TOLD ME THAT THE THROTTLE-BODY WAS SHOT AND WOULD COST ANOTHER $430 TO FIX.I PROMPTLY CALLED FORD CUSTOMER CARE LINE AND WAS TOLD THAT THEY WOULD CONTACT THE SERVICE MANAGER AT MY FORD DEALERSHIP TO WORK OUT A PAYMENT PLAN FOR ME TO GET IT FIXED STILL AT MY COST. THIS IS CRAZY THAT I PAYED OVER 26,000 FOR A VEHICLE THAT I STILL OWE 11,000 ON AND UNDER 5 YEARS OLD WITH 42,000 MILES AND THIS IS MY 3RD MAJOR PROBLEM WITH IT.. HAVE ALREADY HAD THE ENGINE PULLED APART ONCE TO BE FIXED AND ONE OF THE DRIVE SHAFTS HAD TO BE FULLY REPLACED. THIS IS UNFORTUNATE BUT WILL BE THE LAST FORD I EVER OWN!!! *TR

NHTSA ODI #10532112

126,000 miles · Jul 25, 2013
Vehicle Speed Control

DRIVING ABOUT 40 MPH VEHICLE LOST SPEED. COULD NOT ACCELERATE . CAME TO A STOP POINT HAD TO TURN OFF VEHICLE. TURN BACK ON AND WAS OK. HAPPENED TWICE. WENT FOR A DIAGNOSTIC AND WAS REPORTED A PROBLEM WITH THROTTLE ACTUATOR CONTROL SYSTEM -.STUCK CLOSED. ???? CHECK WITH DEALER $435.00 . CHECK ONLINE AND FOUND OUT THAT MERCURY M…

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DRIVING ABOUT 40 MPH VEHICLE LOST SPEED. COULD NOT ACCELERATE . CAME TO A STOP POINT HAD TO TURN OFF VEHICLE. TURN BACK ON AND WAS OK. HAPPENED TWICE. WENT FOR A DIAGNOSTIC AND WAS REPORTED A PROBLEM WITH THROTTLE ACTUATOR CONTROL SYSTEM -.STUCK CLOSED. ???? CHECK WITH DEALER $435.00 . CHECK ONLINE AND FOUND OUT THAT MERCURY MARINER IS HAVING THIS PROBLEM BUT NO RECALL ? *TR

NHTSA ODI #10531830

Official recalls

1

14V284000 · Steering:electric Power Assist System

May 29, 2014

Ford Motor Company (Ford) is recalling certain model year 2008-2011 Ford Escape and Mercury Mariner vehicles manufactured August 18, 2006, through September 11, 2010. The affected vehicles have a steering torque sensor that may not be able to properly detect driver steering input. As a result, the system could remove the Electric Power Steering (EPS) assist.

Consequence & remedy

Consequence: If power steering assist is lost, greater driver effort would be required to steer the vehicle at low speeds, increasing the risk of a crash.

Remedy: Ford will notify owners, and dealers will update the software for the power steering control module (PSCM) and the instrument cluster module, free of charge. If a vehicle shows a history of a loss of the torque sensor signal or fault codes relating to the PSCM when the vehicle is brought in for the recall remedy, the affected components will be replaced, free of charge. The recall began on July 18, 2014. Owners may contact Ford customer service at 1-800-392-3673. Ford's number for this recall is 14S05.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

2

DP15001 · Loss Of Power Steering While Driving

Opened Apr 1, 2015 · Closed Jun 14, 2018

Status: closed (inferred from source dates) · Steering:electric Power Assist System

On May 27, 2014, amended June 2, 2014, Ford Motor Company (Ford) submitted a Defect Information Report (DIR) to NHTSA describing a safety defect that may result in a sudden loss of power steering assist while driving in approximately 746,067 model year (MY) 2008 through 2011 Ford Escape vehicles equipped with electric power assisted steering (NHTSA 14V-284, Ford 14S05). Ford's DIR described the defect condition as a poor signal to noise ratio [SNR] in the torque sensor within the Electric Power Assisted Steering (EPAS) system [which] does not allow the PSCM to determine the driver's steering input. When the system detects this fault condition, it transitions the EPAS system to the fail-safe/manual steering mode.Ford's DIR indicates that loss of power steering assist while driving would require higher steering effort at lower vehicle speeds, which may result in an increased risk of a crash.Ford's remedy instructs dealers to check the Power Steering Control Module (PSCM) for Diagnostic Trouble Codes (DTCs) to determine the proper repair procedure. If no DTCs are present, dealers are to update the PSCM and instrument cluster module software. The updated PSCM software changes the torque sensor fault strategy so that the SNR condition does not result in a loss of power steering assist while driving.In addition, audible and visual warnings are provided for torque sensor faults.If DTCs indicating faults in the torque sensor, PSCM or Power Steering Motor (motor) are present in the initial recall inspection, the dealer performs the following repairs: 1) replaces the torque sensor for torque sensor faults (DTC B2278); or 2) replaces the steering column for faults related to the PSCM (DTC B1342) or motor (DTC B2277).Continued in attachment pages

PE13003 · Electronic Throttle Body Malfunction

Opened Feb 21, 2013 · Closed Feb 28, 2014

Status: closed (inferred from source dates) · Engine

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