RoadVitals

2009 Mercury Mariner Driver assistance Problems

Owner-reported complaints naming the driver-assistance system, filed with NHTSA

Data refreshed

Driver assistance reportsComplaints are reports submitted to NHTSA by owners and drivers. NHTSA does not verify most reports before publishing them, and a complaint does not establish that a defect exists. Volume is influenced by how many of a vehicle were sold, how long it has been on the road, and how much attention an issue has received.
47
Latest Dec 3, 2024
Share of all reportsThis category as a share of every owner report on file for this model year. One report can name more than one component, so the categories overlap.
15%
of 315 total
Crash or fire reportedReports in this category whose submitter recorded that a crash or a fire occurred. The reporter's own answer on the NHTSA form, not a verified finding.
1
Injuries or deaths reportedTotals the submitters entered on their own reports in this category. Not verified by NHTSA and not a casualty statistic.
0

What this page shows

Reports naming forward-collision avoidance, lane keeping, back-over prevention, cruise control and related electronic driver-assistance systems. Every record below is an owner-reported complaint about the 2009 Mercury Mariner submitted to NHTSA — not a confirmed defect, not a recall and not a manufacturer bulletin. 47 reports on file name it.

Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.

Owner reports naming driver-assistance

The 25 most recent of 47, in the owner's own words

Driver assistanceSteering
Filed Dec 3, 2024

Unknown

NHTSA ID
11628708
Incident
Dec 3, 2024
Driver assistanceElectricalSteering
Filed May 11, 2023

The PCM shorts out and fails when sparkplug and Coil packs replaced this cause the steering system to fail speedometer to quit and no transmission connection

NHTSA ID
11521608
Incident
May 11, 2023
Driver assistanceSteering
Filed Nov 23, 2022

THE POWER STEERING ASSIST LIGHT CAME ON AND I KEPT LOSING MY POWER STEERING. I COULD TURN THE CAR OFF THEN BACK ON AND IT WOULD WORK AGAIN AND THEN ALL OF A SUDDEN IT WENT OUT AGAIN IN THE MIDDLE OF A CURVE AND WINT COME BACK ON.

NHTSA ID
11494660
Incident
Nov 23, 2022
Driver assistanceElectricalSteering
Filed Sep 16, 2020

VEHICLE SUDDENLY LOSES POWER STEERING ASSISTANCE WHILE DRIVING. IF THE IGNITION KEY IS CYCLED THE POWER STEERING ASSIST MAY FUNCTION AGAIN. THE AFFECTED COMPONENT WAS DETERMINED TO BE THE POWER STEERING CONTROL MODULE (PSCM) WITHIN THE STEERING COLUMN. A RECALL WAS ISSUED FOR THIS IN 2014, HOWEVER ONLY THE SOFTWARE WAS UPDATED WHEN THE VEHICLE WAS BROUGHT IN FOR REPAIR. THE MALFUNCTIONING COMPONENTS WERE NOT REPLACED AND THE ISSUE HAS RETURNED.

NHTSA ID
11355433
Incident
Aug 1, 2020
Mileage
150,000 mi
Driver assistanceEngineFuel system
Filed Feb 18, 2018

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.

NHTSA ID
11073494
Incident
Feb 10, 2018
Mileage
112,000 mi
Driver assistanceOther / unspecifiedSteering
Filed Nov 12, 2017

I PURCHASED MY 2009 MERCURY MARINER IN 2015! RECENTLY, AS I WAS UNAWARE OF THE RECALL WITH FORD A FEW YEARS BACK, I'VE HAD FRONT AND REAR BEARING ISSUES! ALSO MY BALLPOINTS WERE DEFECTED AND MY CONTROL ARMS! MY TIRE PRESSURE SENSOR FAULT STAYS ON! I'VE TAKEN MY 2009 MERCURY MARINER TO STAR TIRE'S BEST ONE AUTO & TIRES AND HAD MY BALLPOINTS, FRONT AND REAR BEARINGS, CONTROL ARMS, AND FRONT WHEEL ALIGNMENT REPAIRED TOTALING IN $780! THREE DAYS LATER ON THE DATE OF 11/11/2017, MY POWER STEERING ASSIST FAULT CAME ON! MY 2009 MERCURY MARINER WAS STATIONARY AND WAS EXTREMELY DIFFICULT TO TURN!

NHTSA ID
11045459
Incident
Nov 11, 2017
Mileage
144,000 mi
Driver assistancePowertrain (other)
Filed Sep 18, 2017

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 ID
11024080
Incident
Sep 15, 2017
Mileage
122,680 mi
Driver assistanceElectricalFuel system
Filed May 23, 2017

WHILE IN MOTION THE CAR WILL STALL CAUSING ME TO PULL OFF TO THE SIDE OF THE ROAD, TURN THE CAR OFF, THEN BACK ON IN ORDER FOR IT TO WORK AGAIN. THIS HAPPENS EVERY 10-15 MILES AND ITS REALLY UNSAFE! I BELIEVE IT IS A DEFECTIVE THROTTLE BODY AND NEEDS TO BE FIXED ASAP BEFORE I CAN CONTINUE DRIVING IT.

NHTSA ID
10991225
Incident
May 19, 2017
Mileage
165,228 mi
Driver assistanceEngineFuel system
Filed Apr 21, 2016

MY 2009 MERCURY MARINER STALLS WHILE ITS IDLE, AT A INTERSECTION OR JUST WAITING. IT STALLS THEN I STARTED UP RIGHT AFTER IT STALLS.

NHTSA ID
10860835
Incident
Jan 10, 2016
Mileage
70,000 mi
Driver assistanceEngine
Filed Feb 8, 2016

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.

NHTSA ID
10824773
Incident
Feb 3, 2016
Mileage
89,000 mi
Driver assistanceEnginePowertrain (other)
Filed Jul 17, 2014

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. *TR

NHTSA ID
10611341
Incident
Jul 17, 2014
Mileage
132,256 mi
BrakesDriver assistanceEngine
Filed May 7, 2014

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. *TR

NHTSA ID
10586997
Incident
May 1, 2014
Mileage
62,854 mi
Driver assistancePowertrain (other)
Filed May 2, 2014

THE VEHICLE SUDDENLY ACCELERATED AND THEN SLOWED DOWN RAPIDLY. PULLED OVER AND PUT CAR IN PARK AND TURNED IT OFF. CALLED MY UNCLE WHO IS A MECHANIC AND WAS NOT TO SURE AS TO WHAT COULD HAVE HAPPENED SINCE HE WAS NOT THERE. STARTED CAR AND REVVED THE ENGINE TO SEE IF ANYTHING UNSAFE HAPPENED. CAR SEEMED OK AND WAS ABLE TO DRIVE IT HOME. MECHANIC LOOKED AT IT THE NEXT DAY BUT COULD NOT FIND ANYTHING WRONG HE SAID OR DUPLICATE THE PROBLEM. *TR

NHTSA ID
10586075
Incident
May 4, 2012
Mileage
38,000 mi
Driver assistancePowertrain (other)
Filed Mar 19, 2014

DRIVING ON HIGHWAY WITH SPEED CONTROL ON AT 75 MPH, ALL OF THE SUDDEN VEHICLE RAPIDLY SPED UP TO 95 MPH. THE VEHICLE JUST TOOK OFF RAVING ENGINE UP. APPLIED BRAKES AND TOOK OFF CRUISE CONTROL. IF THERE HAD BEEN TRAFFIC THIS COULD OF BEEN A DANGEROUS OR DEADLY INCIDENT. WE HAVE HAD THE VEHICLE IN BEFORE FOR THE SAME PROBLEM, IT WOULD SPEED UP WHILE MAKING A TURN. FORD DEALERSHIP SAID IT WAS A TRANSMISSION PROBLEM. ALL REPAIRS HAVE BEEN DONE BY A FORD DEALERSHIP. *TR

NHTSA ID
10573444
Incident
Mar 16, 2014
Mileage
59,000 mi
Driver assistanceFuel system
Filed Feb 7, 2014

DRIVING HOME FROM WORK THE CAR WENT INTO "LIMP MODE", PULLED OVER TO SIDE OF ROAD, CALLED FOR TOW AND HAD CAR TAKEN TO SHOP FOR DIAGNOSTICS AND REPAIR. SHOP DETERMINED IT WAS FAULTY THROTTLE BODY ( THERE WERE OVER 700,000 ORDERS FOR REPLACEMENTS ON WEBSITE AT THIS TIME)PART WAS ON BACKORDER---CAME IN, WAS REPLACED AND I PAID THE BILL OF $720.60 FOR PARTS, LABOR, TOWING AND TAXES. I GOT LETTER FROM FORD THAT PART IS NOW A RECALL ITEM SO I TAKE THE BILL TO KERRY FORD IN CINCINNATI, OH AND THEY TAKE ALL OF MY INFO AND SEND ME A CHECK FOR $167.85 AND TELL ME TOO BAD FOR NOT HAVING WORK DONE AT FORD STORE, THAT'S ALL I AM GOING TO GET. THIS DOES NOT EVEN COVER THE COST OF THE PART ALONE. SO AS A STRANDED MOTORIST, I WAS SUPPOSED TO THINK OF A FORD DEALERSHIP FIRST INSTEAD OF SAFETY FIRST AND GETTING MY CAR REPAIRED. *TR

NHTSA ID
10563411
Incident
Oct 17, 2013
Mileage
117,605 mi
Driver assistanceEngine
Filed Jan 5, 2014

THE VEHICLE SUDDENLY LOOSES POWER AND ACCELERATOR IS UNRESPONSIVE. THIS FIRST OCCURRED WITH APPROXIMATELY 33,000 MILES WHILE STILL IN WARRANTY AND DEALER REPLACED THROTTLE BODY. VEHICLE WAS FINE UNTIL NOVEMBER OF 2013 WITH ABOUT 80,000 MILES. THIS IS VERY DANGEROUS BECAUSE VEHICLE GOES DOWN TO IDLE SPEED AND WITH NO POWER, IT'S VERY HARD SOMETIMES TO GET TO THE SHOULDER OF THE ROAD WITH ONLY COAST CONTROL OF VEHICLE. THIS SHOULD BE A RECALL ISSUE AS I'M AWARE OF THE MANY OTHERS HAVING SAME PROBLEM. I'M MAKING THIS COMPLAINT TO TRY AND HAVE THIS ISSUE RESOLVED BEFORE SOMETHING TRAGIC HAPPENS AND ALSO TO DOCUMENT THIS SAFETY ISSUE. *TR

NHTSA ID
10558529
Incident
Jul 28, 2011
Mileage
33,000 mi
Driver assistanceFuel system
Filed Jan 2, 2014

CAR ENGINE STOPPED WHILE DRIVING AT A LOW (10-20 MPH) SPEED. SECOND TIME THIS HAPPENED. FIRST TIME ON 2011 REPLACED THROTTLE BODY THEN. IT HAPPENED AGAIN 12/31/2013. FORD SERVICE SAID THROTTLE BODY NEEDS TO BE REPLACED AGAIN. *TR

NHTSA ID
10558150
Incident
Dec 31, 2013
Mileage
70,000 mi
Driver assistanceEngine
Filed Dec 28, 2013

WHEN PULLING UP TO A STOP SIGN THE CAR JUST STOPPED NEXT TIME COMING OFF INTERSTATE TO STOP THE VEHICLE KINDA OF LUNGED THE NEXT TINE IT JUST TRIED TO STALL HAD TO PUT IN NEUTRAL AND KEEP FOOT ON GAS TO KEEP IT RUNNING. *TR

NHTSA ID
10557514
Incident
Dec 7, 2013
Mileage
60,000 mi
Driver assistanceFuel system
Filed Dec 27, 2013

WHILE DRIVING THE MARINER AT 45 MPH ON A BUSY STREET, THE ENGINE WENT INTO LIMP MODE, LOST ALL ACCELERATION AND SLOWED TO 5 MPH. I WAS NEARLY REAR-ENDED BY THE TRUCK BEHIND ME AND WAS FORCED TO PULL UP ONTO A SIDEWALK, DAMAGING MY TIRE. PULLED THE CODES ON THE CAR AND GOT A P111 CODE. DID SOME SEARCHING ON THE INTERNET AND FOUND THAT THIS IS A COMMON ISSUE AND AN EXTREME SAFETY HAZARD. I WAS VERY HAPPY THAT I WAS THE DRIVER, AND NOT MY 16 YEAR OLD DAUGHTER!!! THIS IS THE SECOND SAFETY ISSUE WE HAVE HAD WITH THIS CAR IN THE LAST MONTH -- EARLIER THE POWER STEERING WENT OUT, AGAIN WITHOUT ANY WARNING IN TRAFFIC. *TR

NHTSA ID
10557434
Incident
Dec 26, 2013
Mileage
94,000 mi
Driver assistance
Filed Nov 27, 2013

TRAVELING ALONG WITH CRUISE CONTROL SET AT 65 WHEN ALL OF A SUDDEN MY VEHICLE DECELERATES. THE "THROTTLE BODY/THROTTLE POSITION SWITCH" INDICATOR LIGHT ILLUMINATED. VEHICLE HAS HAD INTERMITTENTLY GONE INTO "LIMP" SINCE THEN. LATELY IT HAS HAPPENED AT LEAST ONCE PER DAY, OFTEN WHEN TRYING TO ACCELERATE QUICKLY OR ABOVE 40MPH. CHECK ENGINE LIGHT ILLUMINATED YESTERDAY (11/26/2013) AND INDICATED A P2111 DIAGNOSTIC CODE (THROTTLE ACTUATOR STUCK OPEN). THIS IS APPARENTLY A FAIRLY COMMON ISSUE ALREADY UNDER INVESTIGATION. THE SOLUTION SEEMS TO BE HAVE A DEALER REPLACE THE THROTTLE BODY (ROUGHLY $400 PARTS AND LABOR). *TR

NHTSA ID
10553974
Incident
Nov 8, 2013
Mileage
109,500 mi
Driver assistance
Filed Nov 8, 2013

I WAS DRIVING ON THE HIGHWAY AND SUDDENLY THE VEHICLE LOST ALL SPEED CONTROL. I COULD NOT ACCELERATE AND THE CAR BEGAN SLOWING DOWN. I HAD TO QUICKLY CHANGE LANES AND PULL OVER TO THE SHOULDER. I PUT THE CAR IN PARK AND TURNED OFF THE ENGINE, WAITED A FEW MINUTES, AND THEN WAS ABLE TO START THE CAR AGAIN. THIS SAME THING HAPPENED TWO DAYS LATER. I HAVE READ OTHER COMPLAINTS ABOUT THIS SAME ISSUE HAPPENING WITH MARINERS BETWEEN 2009-2011. THIS NEEDS TO BE RECALLED AND FIXED. IT IS INCREDIBLY DANGEROUS TO LOSE ALL ACCELERATION CONTROL GOING 65 MPH!! *TR

NHTSA ID
10551473
Incident
Nov 6, 2013
Mileage
68,000 mi
Driver assistanceFuel system
Filed Nov 1, 2013

DURING NORMAL HIGHWAY DRIVING CONDITIONS, CAR SUDDENLY STOPPED ACCELERATING, COULD PUSH THE ACCELERATOR ALL THE WAY TO THE FLOOR AND GET NO POWER. ENGINE DID NOT STALL OUT, BUT WOULD NOT PROVIDE POWER. WAS ABLE TO PULL OVER AND TURN OFF CAR, THEN TURN BACK ON, AND PROBLEM WAS GONE. AFTER ANOTHER 15 MILES OR SO IT HAPPENED AGAIN. TOOK THE CAR TO THE DEALERSHIP AND THEY REPORTED THAT IT WAS A BAD THROTTLE BODY AND HAD TO BE REPLACED. *TR

NHTSA ID
10550471
Incident
Oct 29, 2013
Mileage
71,000 mi
Driver assistanceEnginePowertrain (other)
Filed Oct 23, 2013

CAR LOST POWER AND STOPPED WHILE DRIVING. ENGINE LIGHT CAME ON THEN WENT OFF. *TR

NHTSA ID
10549301
Incident
Oct 22, 2013
Mileage
101,567 mi
Driver assistance
Filed Oct 21, 2013

WHILE DRIVING ON THE TACONIC STATE PARKWAY, TRAVELING AT APPROX. 55 MPH, THE ENGINE FAILED TO RESPOND TO THE THROTTLE AND WHILE THE CAR WAS STILL IN GEAR, THE VEHICLE MERELY BEGAN COASTING. I SAFELY STEERED THE CAR TO THE SHOULDER OF THE ROAD, AND TURNED THE VEHICLE OFF. AFTER APPROXIMATELY 2 MINUTES, I WAS ABLE TO RE-START THE CAR (WITH SOME HESITATION). I THEN TURNED AROUND TO ATTEMPT TO DRIVE HOME. THE SAME SITUATION OCCURRED ONE MORE TIME WHILE TRAVELING HOME (APPROX. 30 MILES). I BROUGHT THE CAR TO METRIC MOTORS OF LAKE CARMEL, NY. THEIR COMPUTER DIAGNOSTICS IDENTIFIED THE PROBLEM AS THE THROTTLE ACTUATOR CONTROL. THEY SAID THAT THEY UNSTUCK THE PART (COST TO DIAGNOSE & MAKE REPAIRS $422+) AND I AGAIN BEGAN DRIVING THE CAR. UNFORTUNATELY, AFTER VISITING NYC ON SATURDAY, OCTOBER 19, 2013, THE SAME PROBLEM OCCURRED, AGAIN WHILE DRIVING HOME ON THE TACONIC STATE PARKWAY. I WAS ABLE TO START THE CAR; HOWEVER, THE PROBLEM RE-OCCURRED APPROXIMATELY 10 MORE TIMES OVER THE 40 MILE RETURN TRIP TO MY HOME. EACH TIME THE ENGINE FAILED TO RESPOND TO THE THROTTLE AND WHILE STILE IN GEAR, MERELY BEGAN COASTING. EACH TIME, I SAFELY STEERED THE CAR TO THE SHOULDER, AND EVENTUALLY RE-STARTED THE CAR AND MANAGED TO MAKE IT HOME. *TR

NHTSA ID
10548809
Incident
Oct 7, 2013
Mileage
97,000 mi
Driver assistanceEngine
Filed Oct 18, 2013

TURNED THE VEHICLE ON, DROVE TO END OF STREET WRENCH AKA CHECK ENGINE LIGHT APPEARED JUST AT THE SAME TIME I CAME TO A STOP VEHICLE STARTED TO SHACK AND IDLE ROUGH AND THEN RPMS STARED GOING OUT OF NORMAL RANGE WITH OUT A STABLE POSITION. AND THEN VEHICLE DIED TWICE WHILE MAKING IT BACK TO HOUSE WHERE I HOOKED UP MY OBD2 CODE READER AND STATED THE IT WAS A P2111 CODE AND STATED:"THROTTLE ACTUATOR CONTROL SYSTEM STUCK OPEN" . *TR

NHTSA ID
10548427
Incident
Oct 18, 2013

Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.

Other components reported on this vehicle

Categories with enough reports to have a page of their own

Elsewhere on this vehicle

Data sources

Data on this page last refreshed .