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Mercury Mariner HybridModel year report

2008 Mercury Mariner Hybrid Problems

Complaints
116filed with NHTSA
Median mileage
81,000miles, 107 complaints with mileage
Recalls
0campaigns on record
Trend
FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
NHTSA crash rating
—overall rating starts with 2011 models
EPA fuel economy
32 mpgcombined, 2.3L 4-cyl · hybrid FWD · 34 city / 30 hwy

Sources: NHTSA records for the 2008 Mercury Mariner Hybrid (complaints, recalls, investigations), NHTSA crash tests, EPA fuel economy. Report an error

What owners report

Owners of the 2008 Mariner Hybrid most often write about the vehicle cutting power or stalling without warning, frequently at highway speed with a red triangle and a stop-safely-now message; many link it to a failed motor electronics cooling pump. A second large group describes brake trouble, with ABS and brake warning lamps and a soft or long pedal that takes much more distance to stop. Loss of power steering assist, reported as sudden heavy steering, rounds out the most common themes.

  1. Engine

    Sudden power loss / stall with "stop safely now" message

    • 47 complaints (41%)
    • median 66,700 mi at 5.2 yrs old (44 state mileage)
    • filed 2010–2023

    Complaints describe the gas engine shutting down without warning, often while cruising at 55-70 mph, with the red triangle warning and a stop-safely-now message on the dash; the vehicle then slows sharply to roughly 20-30 mph and the driver works across lanes to reach the shoulder. Several owners say restarting after a stop clears it temporarily before it recurs miles later. Dealers in the complaints most often pointed to the motor electronics cooling pump, coolant pump, or coolant temperature sensor; some also replaced the throttle body and reprogrammed the powertrain module, and a few owners report it still happening after repair. Reported across a wide mileage range in the sample, from roughly 37,000 to over 100,000 miles, commonly at highway speeds and sometimes recurring within a few miles of a restart.

    2 related service bulletins

    What to check: Ask for service records on the motor electronics cooling pump, coolant pump, and any throttle body or powertrain module reprogramming. Note whether the red triangle or stop-safely-now message appears on a test drive.

    2 excerpts from owner complaints in NHTSA records

    “A stop safely now warning message came on when I was driving on the freeway at 60 miles per hour. The car immediately lost power and became difficult to steer. I pulled over to the right shoulder as safely and quickly as possible. This has occurred multiple times.”

    NHTSA complaint #10630673, filed 2014-09, 60,000 miles

    “I was driving my 2008 Mercury Mariner Hybrid when the stop safely light came on and the car died instantly. I was on the highway driving 55 MPH and it was extremely dangerous to have rapid deceleration at that time. I was barely able to pull my car over to the side in a safe manner. I turned off the car, restarted and proceed to get on the highway again. It happened three times. Needless to say, I do not feel safe driving my vehicle anywhere at this point in time.”

    NHTSA complaint #10349490, filed 2010-08, 41,000 miles
  2. Brakes

    Brake warning lamps with weak or long pedal travel

    • 23 complaints (20%)
    • median 126,000 mi at 9.5 yrs old (23 state mileage)
    • 1 mention a crash, fire or injury
    • owner-quoted repair $4,100 (median of 5 quotes)
    • filed 2010–2019

    Owners describe the ABS and brake or service brake system warnings lighting up, sometimes with a regenerative braking disabled notice, followed by a pedal that feels soft or goes near the floor and stops the vehicle much less sharply than expected. Several complaints say the vehicle was diagnosed with a failed hydraulic control unit or ABS module and the part was replaced, while others report dealers could not duplicate the problem. Some owners mention having to use park or coasting to bring the vehicle to a stop. Reported from about 29,000 miles up to around 150,000 miles, at both low speed and highway speed, in some cases with warnings appearing intermittently for many miles before the pedal problem.

    2 related service bulletins

    What to check: Check that the ABS and brake warning lamps come on and go off normally at startup, and ask whether the hydraulic control unit or ABS module has been replaced; a service bulletin describes a bleed procedure after hydraulic brake component replacement.

    2 excerpts from owner complaints in NHTSA records

    “Failure of ABS brakes on 2008 Mercury Mariner Hybrid. This has happened to my car twice. Summer of 2009 and the summer of 2010. Both times I have had to replace the master brake cylinder. Symptoms include inconsistent braking response and loss of brake fluid. Driver experiences overly sharp braking and a grabbing sensation as well as very soft braking and coasting sensation almost as if there are no brakes or very little braking. It is very hard to drive safely in this condition. …”

    NHTSA complaint #10344574, filed 2010-07, 42,000 miles

    “Heading west on the interstate I took the off ramp and came to a stop. As I was stopping a tone rang out, the ABS light, and brake warning light came on. The brakes didn't feel as stiff as they should have but I did come to a stop as I wasn't traveling very fast while approaching the stop sign. I turned left and proceeded over the overpass towards a side road when a car that had come up the off ramp from the eastbound lane rolled the stop sign and stopped with the nose of their vehicle in my lane. …”

    NHTSA complaint #11130011, filed 2018-09, 152,788 miles
  3. Steering

    Loss of power steering assist (very heavy steering)

    • 19 complaints (16%)
    • median 105,000 mi at 7.0 yrs old (18 state mileage)
    • filed 2010–2023

    Complaints describe the steering suddenly becoming very heavy at low speed, in turns, or when pulling away from a stop, sometimes with a power steering assist fault message and sometimes with no warning light. In several cases the assist returns on its own after a moment. Dealers in the complaints diagnosed the power steering control module or the torque sensor, and a few owners also reported that power steering loss came with brake codes. Mostly reported between roughly 48,000 and 160,000 miles, at low speed and during turns, occasionally starting right after ignition.

    What to check: Ask whether the power steering control module or torque sensor has been replaced, and turn the wheel from lock to lock at idle during a test drive to feel for sudden heaviness.

    2 excerpts from owner complaints in NHTSA records

    “I have a 2008 Mercury Mariner Hybrid 4 wheel drive. On occasion the steering will loose power assist while turning. The loss of power lasts for a few seconds before the power assist returns. This problem is dangerous as I have to compensate for the loss of steering assist by turning the steering wheel harder, then when the power assist returns the vehicle turns more than I want because the wheel is easy to turn as I am applying a lot of pressure to the steering wheel. …”

    NHTSA complaint #10306742, filed 2010-02, 37,200 miles

    “While driving the vehicle the power steering suddenly stops working and the steering gets extremely stiff. This has been happening for a few months now. At first it was in the middle of winter and I attributed it as a freak occurrence due to the cold weather. The next time it happened it was a warm spring day. Now it does not occur frequently, but without warning. One time I was making a left turn at a intersection and the steering froze up, causing me to make my turn really wide. …”

    NHTSA complaint #10542453, filed 2013-09, 110,000 miles
  4. Engine cooling

    Coolant pump codes and heat-related power reduction

    • 18 complaints (16%)
    • median 66,500 mi at 4.8 yrs old (18 state mileage)
    • filed 2010–2015

    Complaints mention stalling or power reduction together with a high temperature warning, and dealers diagnosing a failed coolant or water pump or coolant temperature sensor. Some owners describe the condition appearing more readily after long runs or in hot weather with the air conditioning on. Reported between roughly 29,000 and 82,000 miles, often on longer drives or in warm conditions.

    2 related service bulletins

    What to check: Request records for coolant pump and coolant temperature sensor replacement, and ask whether any battery pack cooling fan codes have been read; the service bulletins cover these codes and high-idle heat conditions.

    2 excerpts from owner complaints in NHTSA records

    “2008 Mariner Hybrid / 67000miles. Engine failure. Was able to limp off highway. After waiting several minutes car restarted and was able to drive approx. 5 miles before it shut off again. Drove to dealer with several shutdowns. Dealer states car needs electronic cooling pump and cht sensor at a cost of $1275.00. Car is still sitting in dealership waiting for my decision to repair or not. Car was not abused. Mostly only one passenger. Car was serviced regularly as per specs at dealership.”

    NHTSA complaint #10335380, filed 2010-06, 67,000 miles

    “The contact owns a 2008 Mercury Mariner Hybrid. The contact stated that while driving 55 MPH, the vehicle stalled. The failure had recurred previously. The vehicle was restarted and operated as designed. The vehicle was taken to a dealer for diagnosis and the contact was informed that the water pump would need to be replaced. The vehicle was repaired. The failure and current mileage was 62,311.”

    NHTSA complaint #10500492, filed 2013-02, 62,311 miles
  5. Brakes

    ABS tone ring failure disrupting ABS and regenerative

    Mentioned in 4 of 60 sampled complaints

    Some owners describe the ABS and regenerative braking shutting off with warning lamps, traced by their mechanics to a cracked or broken tone ring on the half-shaft. Complaints say the dealer would not sell the small ring separately and instead required replacing the axle assembly, making the repair expensive. Reported between roughly 66,000 and 143,000 miles in the sample, often first noticed as intermittent warning lamps before a full brake system fault.

    1 related service bulletin

    What to check: Ask whether the tone rings or half-shafts have been replaced, and have warning codes read before purchase; a service bulletin covers ABS warning lamps with specific diagnostic codes.

    An excerpt from owner complaints in NHTSA records

    “I have a 14s05 hard steering, power steering control pump no longer works. This causes my brakes to seize up. The diagnostic also indicates codes c1480 r/f, c1478 l/f, c1313b r/f. Indicating. Brake failure. I am driving this car to commute 45 miles each way to work daily. I am very afraid because this car is a hazard. My VIN# does not show that this car is among the group that have a problem but. I do have it. Ford is aware, why should I have to pay for the cover up of their error? …”

    NHTSA complaint #11080010, filed 2018-03, 154,000 miles

Buying note. These cars are old enough that repair history matters more than mileage: ask specifically about the cooling pump, throttle body service, brake hydraulic unit, and power steering module. A pre-purchase inspection that reads stored codes and checks the ABS and brake warning lamps on a test drive is worth the cost on this model year.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.

NHTSA recorded 116 consumer complaints for the 2008 Mercury Mariner Hybrid. 107 of the complaints include a mileage, and 16% of those were filed for vehicles with under 50,000 miles; the median is 81,000 miles. Of all complaints, 2 involved a crash, according to the filers. NHTSA lists 0 recall campaigns and 6 technical service bulletins for this model year.

Not compared (fewer than 3 comparable model years). Model years 2008–2023 of the same vehicle that have at least 25 complaints are compared, and a model needs at least 3 of them.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Also reported: Hybrid propulsion system (2), Body and structure (1).

Example complaints

Brakes: “Abs light came on and brake system failed to stop the vehicle until pressed hard the brake pedal. The ABS light comes on and off. Gave the vehicle for diagnostics to mechanic - codes u0418 invalid data from brake control module, codes c1478, c1479, c1480, wheel brake pressure control plausibility, u2023 communication network fault, mechanic gave estimate of $5542.00 to replace ABS control assembly. I called ford customer service, they declined to assist at this time. No help provided to put my vehicle back on road. This is a safety issue.”

NHTSA complaint #11165630, filed 2019-01, 122,000 miles

Engine: “My 2008 Mercury Mariner Hybrid has a dangerous high speed stall condition. It is very serious and puts the vehicle and occupants in a situation that causes a very high risk of a crash. This said, my vehicle is not covered in the current recall? Why not?”

NHTSA complaint #10640472, filed 2014-10, 100,000 miles

Steering: “The power torque sensor for the power steering was already recalled and had the system updated before I got the car in 2014. The cars steering wheel starts shaking a little then all of a suddle the steering wheel locks up and the power steering stops working, so you can't hardly turn it. I came inches from getting in a wreck. You can update the system but it will only work for about 1 or 2 years.”

NHTSA complaint #10956838, filed 2017-02, 110,000 miles

Electrical system: “We bought vehicle in jan, 2018 from a private party, as a work vehicle for my husband, who is a usps rural route carrier. Two weeks after purchase, the anti-lock brake light went on, and the car would not stop when it was supposed to, which was very dangerous in winter. We believe the prior owner knew about this. The light would just go on & off with no pattern. About 1 1/2 months later, he was driving on a 2 lane hgwy (55 MPH) delivering mail. He went to pull forward but the car made a brief noise and then everything just stopped working. …”

NHTSA complaint #11170270, filed 2019-01, 136,500 miles

Mileage when problems were reported

16% of the 107 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 59,215 and 120,000 miles.

0%0–104%10–2512%25–5032%50–7518%75–10021%100–15013%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (107 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 81,000 miles.

Complaints by year filed

Trend: falling. Complaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.

’11’1327’15’17’19’21’23
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Crash test ratings

NHTSA's 5-Star Safety Ratings for the 2008 Mercury Mariner Hybrid. Frontal results are shown driver / passenger; rollover shows the star rating and NHTSA's estimated risk of rolling over in a single-vehicle crash.

VersionOverallFrontalSideSide poleRollover
Mariner Hybrid · sedan FWD/AWDnot rated4 / 5——3 · 20.4% risk
Mariner Hybrid · sedan FWD/AWDnot rated3 / 5——3 · 20.4% risk

Ratings before the 2011 model year come from an older, less demanding test and are not comparable with ratings for 2011 and later.

Source: NHTSA New Car Assessment Program (5-Star Safety Ratings), nhtsa.gov/ratings.

Fuel economy and running cost

EPA ratings for each 2008 Mercury Mariner Hybrid version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
Mariner Hybrid 4WD2.3L 4-cyl · hybridCVT292728$2,400
Mariner Hybrid FWD2.3L 4-cyl · hybridCVT343032$2,100

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

NHTSA lists no recall campaigns for the 2008 Mercury Mariner Hybrid in the data used here. A recall can apply to some vehicles of a model year and not others, so check a specific vehicle by VIN at nhtsa.gov/recalls.

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 6 on record; the latest 6 are shown.

Other model years of the Mercury Mariner Hybrid

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
2010959,2500—32—Not enough data
20092193,0000—32—Stable
200811681,0000—32Not compared (fewer than 3 comparable model years)Falling
20073170,0000—27Not compared (before 2008)Rising
200634104,0000—27Not compared (before 2008)Falling

All Mercury Mariner Hybrid model years · Best and worst years by complaints

Frequently asked questions

What are the most common problems with the 2008 Mercury Mariner Hybrid?

Owners of the 2008 Mariner Hybrid most often write about the vehicle cutting power or stalling without warning, frequently at highway speed with a red triangle and a stop-safely-now message; many link it to a failed motor electronics cooling pump. The issues reported most often: Sudden power loss / stall with "stop safely now" message; Brake warning lamps with weak or long pedal travel; Loss of power steering assist (very heavy steering).

How many NHTSA complaints does the 2008 Mercury Mariner Hybrid have?

NHTSA recorded 116 consumer complaints for the 2008 Mercury Mariner Hybrid as of Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2008 Mercury Mariner Hybrid is reported most often?

Brakes is named most often, in 34 complaints (29% of the total), followed by engine with 28.

Has the 2008 Mercury Mariner Hybrid been recalled?

NHTSA lists no recall campaigns for this model year in the data used here. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

What gas mileage does the 2008 Mercury Mariner Hybrid get?

The EPA rates the 2008 Mercury Mariner Hybrid (Mariner Hybrid FWD, 2.3L 4-cyl · hybrid) at 32 mpg combined, 34 city and 30 highway, with an estimated annual fuel cost of $2,100 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2008 Mercury Mariner Hybrid reported?

Among the 107 complaints that include a mileage, the median is 81,000 miles and the middle half falls between 59,215 and 120,000 miles; 16% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Crash ratings are from NHTSA’s New Car Assessment Program. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.