Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2010 Mercury Mariner owners, lightly cleaned up (personal details are redacted by NHTSA).
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. …
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.
Switch for ac wont blow out air. Took it to valoline to add freon.. They said, it was full.. Cold worked for 5 days then ac stopped working at hotest time of month... Took vehicle back and they stated, it was full still but added more freon to make me happy.. After a few days no ac and I took to a mechanics business. The owner and 4 others stated that the belt is turning maybe they overfilled it.. Told me to take it back to valoline and have them take out all freon then put amount back in but not to full. I did, worked for 2 days now again no ac. Blower worked but no ac comes out.. I cant afford anymore visits. Now as of yesterday the blower will only work on number 4. 1 2 3 nothing comes out. Please assist me with this problem.. I have been so happy with this car for 3 years. I take excellent care of everything it needs. First Ford I ever owned... …
On that date, I was driving home with my wife at approximately 2 pm. Suddenly, the car went off and the steering wheel went stiff. As I tried to move unsuccessfully, we went down to a slope of about 20 degrees. As a result, both of us had to be taken for emergency treatment for knocks, cuts and follow up checks. So far, it has cost us $16,497.00 and repair of the car us$6,853.00. There has been other events where the car suddenly stops and the steering wheel becomes stiff. But, I don t use the car in the highway but only for shorts errands and within the area where we live. Its been a nightmare. I have changed the throttle casing module, the restraint control module, I put a rubber stop on the acceleration pedal, etc. Again, out of the accident it has been over 4 thousand dollars in trying to fix the car.
1. Outside review mirrors do not defrost. They were frozen and I was on the highway putting my life in danger because I could not see outside vehicles passing to be able to go right or left. Then a week later their was frost on the mirrors and still they would not defrost again I couldn't see other vehicles on either side of my vehicle. 2. There is a gear shifting problem as well. Whenever I take off at a stop my car kicks real hard and loud enough to scare me. I have reported this several times with the dealer that I bought my vehicle from and they cannot find the problem. They have heard it do this but cannot seem to find the problem.
Tl* the contact owns a 2010 Mercury Mariner. While driving at approximately 45 MPH, the maintenance warning light illuminated and the vehicle jerked violently. In addition, the vehicle failed to accelerate when the accelerator pedal was depressed. The failure recurred intermittently. The vehicle was taken to the dealer, who inspected the vehicle but was unable to diagnose the failure. After leaving the dealer, the maintenance and the engine warning light illuminated. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 130,980.
Power steering suddenly stopped working while I was driving. The vehicle is extremely difficult to navigate but I was able to pull off the road to a safe area. After shutting the car off for 15 minutes and restarting the lack of power steering remained, but there was now a message saying "power steering assist fault". This car has several other electrical problems with regard to the A/C & blower, and also the drivers side window and dome lights work sporadically.
Vehicle's electronic power steering turned off in the middle of driving, turning on highway, this has happened 3 times, seems like when the heat is on. Recall 14s05c shows up in service records from this car. Works was done my mahopac Ford, mahopac, ny. Reflash ic and pscm. This recall was apparently addressed, but the problem has come back. I just bought this car used two weeks ago. It did not have this problem until I turned the heat on. Not sure what to do.
Tl* the contact owns a 2010 Mercury Mariner. While driving approximately 50 MPH, an unknown wrench warning indicator illuminated. The accelerator pedal was depressed, but the vehicle failed to accelerate. After waiting a few moments, the vehicle restarted. The failure recurred numerous times. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 80,000.
Tl* the contact owns a 2010 Mercury Mariner. While driving unknown speeds, the steering wheel became difficult to turn while making turns. In addition, the battery warning indicator illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted and referred the contact to NHTSA. The failure mileage was 120,000.
Electrical complaints in other Mariner years
Frequently asked questions
How common are electrical problems on the 2010 Mercury Mariner?
NHTSA has 29 complaints about the electrical system of the 2010 Mercury Mariner, 11% of the model year's 270 complaints. The component named most often is 12v/24v/48v battery (1 mentions).
Is there a recall for 2010 Mercury Mariner electrical problems?
No. NHTSA lists no electrical system recall for the 2010 Mercury Mariner, though it has 2 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2010 Mercury Mariner electrical problems start?
Half of the complaints with a recorded mileage happened before about 59,000 miles, and 8% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 1 fire and 2 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.