Problems · NHTSA complaints

2005 Mercury Mountaineer problems

Owners filed 82 complaints about the 2005 Mercury Mountaineer with NHTSA between Jun 2005 and Aug 2023. The most-cited component is structure (26).

Complaints
82
Filed with NHTSA
Crashes
6
Reported by owners
Fires
0
Reported by owners
Injuries
1
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Structure26
  2. Power train19
  3. Vehicle speed control13
  4. Engine7
  5. Electrical system5
  6. Steering5
  7. Engine and engine cooling5
  8. Air bags3
  9. Visibility3
  10. Service brakes, hydraulic3
  11. Equipment2
  12. Fuel system, gasoline2
  13. Wheels1
  14. Fuel/propulsion system1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20052
20063
20075
20088
200910
201010
20118
20124
20133
20146
20157
20165
20171
20184
20191
20201
20210
20221
20233

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Structure

26 reports1 crash
“TL* THE CONTACT OWNS A 2005 MERCURY MOUNTAINEER. THE CONTACT STATED THAT THE REAR HATCHBACK PANEL WAS CRACKED IN SEVERAL LOCATIONS. THERE WERE NO WARNING INDICATORS ILLUMINATED. THE CONTACT CALLED THE LOCAL DEALER (FIVE STAR FORD, 6618 NE LOOP 820 AT RUFE SNOW, NORTH RICHLAND HILLS, TX 76180-7844, 817-500-0097) AND WAS INFORMED THAT THEY COULD NOT REPAIR THE VEHICLE. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS CONTACTED AND REFERRED THE CONTACT TO THE LOCAL DEALER. THE FAILURE MILEAGE WAS 100,000.”
Owner complaint to NHTSAFiled Dec 31, 2018StructureODI 11164258

Power train

19 reports1 crash
“started losing power ,did not want to go pas 30 miles per hr ,then it ramed up and came to a stop with no acceleration ,i shut it off then start it again and was able to get home at a low rate of speed while continuing to have these problems, another day while far away from home the engine rammed up again minimizing my speed as the transmission was slipping and not go fast then my O/D over drive went on flashing a light ,while the engine kept steady at 20-30 miles per hour while accelerating increasing no speed ,now my SUV will not run wright, it will kick into gear at times constantly and cause problems driving safely ,this is a common problem I'm hearing and reading in the internet with the ford/ mercury mountaineer the manufactory does not want to accept responsibility with this problem ..... this is clear a RECALL ISSUE that needs to be addressed before someone gets killed on the highway by getting rammed by a semi-truck which it almost happened to me !!!! a multi-million dollar law suit is in order if they do not acknowledge and fix this problem”
Owner complaint to NHTSAFiled Aug 10, 2022Power train, Vehicle speed control, EngineODI 11478634

Vehicle speed control

13 reports3 crashes
“I PURCHASED A USED 2005 MERCURY MOUNTAINEER LAST MONTH, WITH 135,400 MILES, WHILE USING CRUISE CONTROL AND TRAVELING APPROXIMATELY 35 MPH, THE ROAD WENT FROM LEVEL TO A VERY SLIGHT DOWNGRADE. THE CAR THEN JUST SHUT OFF AFTER AUDIBLE WARNING BELL WAS HEARD. NOTICED DASHBOARD LIGHTS WERE ALL LIT AND BATTERY GAGE WAS NORMAL. I LOST POWER STEERING, BRAKES AND OIL PRESSURE. AFTER PULLING SAFELY TO THE SIDE OF THE ROAD, I RESTED FOR 30 SECONDS BEFORE RESTARTING THE CAR, WHICH SUBSEQUENTLY OPERATED NORMALLY. AFTER TAKING IT IN FOR AN OIL CHANGE AND SAFETY CHECK, I WENT ON A 450 MILE WEEKEND TRIP AND HAD NO ISSUES, RESTRICTING CRUISE CONTROL TO HIGHWAY SPEEDS. THE OTHER DAY, I WAS TRAVELING ON A DIFFERENT STRETCH OF LEVEL ROAD IN MY TOWN WHILE USING CRUISE CONTROL AT APPROX. 35 MPH. AFTER HEADING INTO A SLIGHT DOWNGRADE, I AGAIN HEARD THE WARNING BELL, FOLLOWED BY ENGINE SHUT OFF. A "CHECK GAGE" LIGHT CAME ON AND I LOST POWER STEERING, OIL PRESSURE AND BRAKES. THIS TIME, I GENTLY SHIFTED THE CAR INTO NEUTRAL, AND WHILE COASTING AT 15-20 MPH I TURNED THE IGNITION OFF BEFORE RESTARTING WITHOUT ISSUE. THE CAR HAS SUBSEQUENTLY OPERATED NORMALLY, BUT I HAVE NOT ENGAGED THE…”
Owner complaint to NHTSAFiled Nov 8, 2018Vehicle speed controlODI 11150051

Engine

7 reports
“ON TWO OCCASIONS THE ENGINE CUT OUT WHILE DRIVING THE CAR, ALL THE ENGINE WARNING LIGHTS CAME ON. ONCE THE CAR WAS SAFELY OFF THE ROAD AND PLACED IN PARK IT WOULD START AND CONTINUE TO OPERATE. THE FORD DEALER SAID THAT THERE WAS NOT FAULT CODE IN THE COMPUTER, THEY COULD NOT DUPLICATE THE FAILURE AND COULD NOT FIND ANY FAULT IN THE ENGINE SYSTEM. FORD SERVICE REPRESENTATIVES SAID I SHOULD GO A DIFFERENT FORD DEALER AND SEE IF THEY COULD SOLVE THE PROBLEM. I FIND SIMILAR ENGINE FAILURES DOCUMENTED ON THE INTERNET FOR THIS GENERATION OF CAR. MORE CURRENT SIMILAR MODEL ARE NOT REPORTED TO HAVE THIS PROBLEM. THUS I ASSUME FORD FOUND AND FIXED THIS PROBLEM. I ASKED THEM TO TELL ME HOW THEY SOLVED THE PROBLEM, THEY SAID THAT WAS NOT POSSIBLE. SO, I HAVE AN OTHERWISE GOOD CAR WHICH I CAN DO USE NOR IN GOOD CONSCIENCE SELL TO SOMEONE ELSE. PLEASE HELP! *TR”
Owner complaint to NHTSAFiled Dec 21, 2016EngineODI 10936824

Electrical system

5 reports1 crash
“TL* THE CONTACT OWNS A 2005 MERCURY MOUNTAINEER. WHEN THE VEHICLE WAS STARTED, THE CONTACT HEARD A KNOCKING NOISE FROM THE MIDDLE OF THE DASHBOARD AND COLD AIR WAS BLOWING FROM THE VENTS. THE DEALER DIAGNOSED THAT THE TEMPERATURE BLENDER ACTUATOR FAILED AND NEEDED REPLACEMENT. THIS WAS THE THIRD TIME THE VEHICLE WAS REPAIRED FOR THE SAME FAILURE. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 98,581.”
Owner complaint to NHTSAFiled Jul 1, 2016Electrical systemODI 10881999

Steering

5 reports
“TL* THE CONTACT OWNS A 2005 MERCURY MOUNTAINEER. WHILE DRIVING 45 MPH, THE POWER STEERING FAILED WITHOUT WARNING. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC, BUT WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS UNKNOWN.”
Owner complaint to NHTSAFiled Aug 29, 2014SteeringODI 10629348
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.