Problems · NHTSA complaints

2010 Mercury Mariner Hybrid problems

Owners filed 279 complaints about the 2010 Mercury Mariner Hybrid with NHTSA between Mar 2010 and Aug 2026. The most-cited component is vehicle speed control (69).

Complaints
279
Filed with NHTSA
Crashes
3
Reported by owners
Fires
2
Reported by owners
Injuries
6
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Vehicle speed control69
  2. Steering63
  3. Engine63
  4. Power train62
  5. Fuel/propulsion system57
  6. Electrical system30
  7. Fuel system, gasoline8
  8. Structure7
  9. Electronic stability control (esc)7
  10. Service brakes6
  11. Visibility6
  12. Air bags5
  13. Exterior lighting4
  14. Suspension2

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 9, 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
20104
20111
20125
2013104
201427
201513
201622
201721
201824
201915
202011
20214
202215
20235
20242
20255
20261

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

Vehicle speed control

69 reports1 crash
“WHEN INTERING TO TUNNEL MY CAR SUDDENLY SPEED UP IT FELT LIKE I HAD THE GAS PEDLE DOWN TO THE FLOOR. EVEN WHILE HOLDING THE BRAKE ALL THE WAY DOWN, THIS DID NOT SLOW THE CAR DOWN MUCH. THERE WERE NO WARNING LIGHTS OR CHECK ENGINE LIGHTS ON THEN OR NOW”
Owner complaint to NHTSAFiled Oct 20, 2016Vehicle speed controlODI 10917605

Steering

63 reports1 crash
“The contact owns a 2010 Mercury Mariner. The contact stated that while driving approximately 20 MPH, an alarm sounded, and the steering wheel locked up. The message "Power Steering Assist Fault" was displayed. The contact was able to drive to the residence nearby. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and informed the contact that the vehicle was previously repaired under recall. The failure mileage was approximately 190,000.”
Owner complaint to NHTSAFiled Aug 11, 2026SteeringODI 11756234

Engine

63 reports1 fire
“Me and my wife purchased a vehicle from a private seller to use for personal commute. A month later we started to notice more issue were occurring with the car then stated from the seller. I took it to an auto body shop to get it inspected and possibly serviced and upon that inspection the clerk stated that there was a milage adjustment done to the vehicle. We contacted the seller to try and return the vehicle and receive our money back, but the dealer refused and requested us to resell it.”
Owner complaint to NHTSAFiled Sep 8, 2025Electrical system, Unknown or other, EngineODI 11685632

Power train

62 reports1 fire
“I was driving when it felt like the vehicle was reving in park then the "wrench" icon appeared on my dash. I went a couple blocks & my vehicle felt like it wasn't shifting automatically as it should. I pulled over & turned it off. It started right back up with no lights on, I went half a block & stopped at a stop sign but while stopped the engine reved up. I was worried I was going to be in an accident. Then the "wrench" light came back on, since I was close to home I figured I'd just try to get home. About another block, the check engine light came on & was making strange noises. I kept my vehicle at about 5-10 mph & got it home. My car was very jerky.”
Owner complaint to NHTSAFiled Aug 13, 2021Power train, EngineODI 11429049

Fuel/propulsion system

57 reports
“Engine light came on after putting fuel in my car it is hapless the codes read emission and fuel issues to replace cap but it is hapless it says it's an issue that needs to be fixed now my engine light won't go off”
Owner complaint to NHTSAFiled May 11, 2025Fuel/propulsion systemODI 11660227

Electrical system

30 reports1 crash1 fire
“When the weather is hot (close to 100 degrees or more) and I am driving with the a/c - my vehicle on 3 occasions will not start after parking the vehicle and trying to restart it. The red padlock sign blinks and it won't start. At first it is trying to turnover but then will continually sound worse and all other warning lights go haywire. I leave the car alone for half a day and it starts up again like nothing happened. On the fourth occasion, the car stopped while driving, just a quiet shutdown and the car glided. This time it did not work for over 24 hours and then started up again like nothing happened. Multiple mechanics and also the dealership cannot figure out the problem because by the time i have it towed to shop, it works again. They did a full check on the car and cannot find anything wrong and there were no diagnostic codes. This issue happens when the weather is hot and poses a safety concern as now it is shutting off while driving and I become stranded each time. (First incident happened 8/25/18, last incident 5/14/22) Total of 4.”
Owner complaint to NHTSAFiled Jun 5, 2022Electrical system, EngineODI 11467626
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 9, 2026

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