Tl* the contact owns a 2007 mercury mariner. The contact stated that the vehicle would not shift into any gear. The vehicle was taken to the dealer where they advised her that the automatic transmission assembly oil cooler, valve, gaskets, drive plate steel, pistons, seals, and screens needed to be replaced. The vehicle was repaired for all components however, approximately 20,000 miles later,…
2007 Mercury Mariner powertrain problems
moderate 10 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
10
Recalls
0
Avg fix
$2,500
When does it fail?
Of the 10 powertrain complaints filed for the 2007 Mercury Mariner, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Powertrain accounts for 30% of every owner complaint on file for this vehicle — the dominant problem area across 3 categories tracked.
No new NHTSA powertrain complaint has been filed on this vehicle in over 14 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners of the 2007 Mercury Mariner describe a pattern of premature transmission failure that strikes without warning. The most common complaint is loss of 2nd and 4th gears, where the transmission either refuses to shift into these gears or skips them entirely, forcing the engine to rev hard while the car barely moves. The transmission also slips unpredictably into wrong gears, and overdrive lights flash or stay illuminated even after the overdrive button is pushed. In several cases, the vehicle shifts from Neutral into Drive on its own.
Failures occur across a wide mileage range—as early as 42,000 miles and as late as 152,000—with some happening suddenly and without any advance warning. One owner reported the vehicle drove fine Sunday morning, then that evening the transmission locked up completely. Transmission shops have told owners this is a known, common problem across 2007–2008 Ford Escapes and Mercury Mariners. One owner points to a Ford publication from 2012 documenting the issue.
The repair costs are substantial: $1,700 to $3,650 for transmission rebuild or replacement. One owner had the transmission repaired for $1,800, only to experience the identical failure three years later, facing another $3,650 bill. Even after dealers or shops replace internal components—oil cooler, valve, gaskets, drive plate, pistons, seals, screens—failures recur within 20,000 miles. An owner notes that Ford has been made aware of the defect but has issued no recall or financial assistance.
Same Mercury Mariner powertrain reports on nearby years: 2005 · 2006 · 2008 · 2009 · 2010
Failure modes owners describe
Loss of specific gears (2nd and/or 4th gear)
Transmission loses ability to shift into or maintain 2nd and 4th gears. Owners report the transmission will skip gears, jump from 1st to 3rd, or refuse to engage the missing gears, forcing heavy engine revving with minimal vehicle movement.
When: Ranges from 42,000 to 152,000 miles; failures observed across various mileage points with no clear pattern
Symptoms owners cite: Unable to shift into 2nd gear; Unable to shift into 4th gear; Engine revs but vehicle barely moves; Transmission jumps from 1st to 3rd gear; Dragging sensation after shift
Repairs/costs cited: Transmission rebuild or replacement required. Repair costs cited: $1,700 to $3,650 for full transmission replacement; $2,000-$2,200 for rebuild/repair. Shops report this is common across 2007-2008 Ford Escapes and Mercury Mariners.
Recalls/TSBs owners mention: No recall mentioned. One owner notes Ford has known about the problem since at least 2012 per Ford publication. Manufacturer offered no assistance in at least one case; another contacted NHTSA.
Transmission slipping and erratic shifting
Transmission shifts unpredictably into wrong gears, slips between gears, or shifts into gear on its own without driver input. Overdrive light flashes or illuminates intermittently.
When: Occurs during normal driving; one instance at 47,000 miles, another at 152,000 miles
Symptoms owners cite: Transmission shifts into unintended gears; Vehicle shifts from Neutral into Drive without input; Overdrive light flashes or stays on; Loud rattle noise from transmission; OD OFF light illuminates
Repairs/costs cited: Dealer diagnostic indicated defective transmission; one case required full powertrain replacement. One failure could not be reproduced or diagnosed by mechanics.
Recalls/TSBs owners mention: Manufacturer directed owner to call NHTSA; no repair assistance offered.
Sudden transmission failure with no prior warning
Transmission abruptly loses function or develops severe performance degradation with no warning signs. Vehicle becomes undriveable or barely moveable immediately before failure.
When: One failure immediately after normal driving with no prior symptoms; another 3 years after initial $1,800 repair
Symptoms owners cite: Loud shaking and noise from transmission; Vehicle barely stays running; Transmission refuses to shift properly; No warning lights or symptoms beforehand
Repairs/costs cited: Full transmission replacement required. Cost: $1,800 for first failure, $3,650 for second failure 3 years later on same vehicle.
Transmission overheating due to inadequate cooling system design
Owner alleges that the transmission coolant is routed through the radiator, which does not adequately cool the transmission fluid, leading to overheating and eventual transmission failure. Described as a design flaw known to Ford.
When: Pattern emerges across multiple vehicles; failures recur even after initial repair
Symptoms owners cite: Repeated transmission failures on same vehicle; Failures after transmission fluid flushes performed
Repairs/costs cited: Preventive maintenance (flushes and fluid services) performed as scheduled did not prevent failures.
Recalls/TSBs owners mention: No recall. Owner states Ford knows this is a design problem but has taken no action.
Internal transmission component failure requiring major overhaul
Multiple internal transmission components degrade or fail, requiring replacement of oil cooler, valve, gaskets, drive plate steel, pistons, seals, and screens. Failures recur even after comprehensive repair.
When: Initial failure at 42,000 miles; recurred approximately 20,000 miles after repairs
Symptoms owners cite: Vehicle will not shift into any gear; Loss of transmission functionality
Repairs/costs cited: Dealer replaced oil cooler, valve, gaskets, drive plate steel, pistons, seals, and screens. Despite comprehensive repair, same failure recurred 20,000 miles later.
Recalls/TSBs owners mention: Manufacturer offered no assistance when failure recurred.
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 9 most recent
The vehicle had been driving perfectly normal all day. In the evening, while driving in a heavily-trafficked area, unexpectedly our mariner would not shift out of 1st gear - the engine revved, but the car would just barely move. It finally shifted into 3rd gear, but never would go into 4th. All the while, the o/d light on the instrument panel was going on and off. This pattern continued for…
Coming off a stop sign, the vehicle would not shift into second, could feel it finally jump into 3. Took it to a transmission shop and was told the transmission had no 2 and 4th gears. Upon looking online, transmissions and powertrains are known defects with this model/year. Just had to spend $2000.00 to have this repaired as Ford ignored previous complaints from consumers!! *tr
Tl* the contact owns a 2007 mercury mariner. The contact stated that she started the ignition and attempted to reverse from a residential driveway but the vehicle was extremely sluggish. The contact stated that it felt as if the vehicle had engaged in neutral. The vehicle was not taken to the dealer. The manufacturer was made aware of the failure. The vehicle was not repaired. The failure and…
Tl* the contact owns a 2007 mercury mariner. While the contact's son was driving the vehicle, the transmission slipped and went into other gears. When the vehicle was in neutral, it shifted into drive on its own. On another occasion, the contact's son stated that the vehicle felt as if it were dragging after it jumped. In addition, "overdrive" appeared on the control panel the vehicle was towed…
I was driving to work and car began to make a loud rattle noise, od light flashed (od off) and pulled over. I attempted to pull back on road and car would not shift into 2nd gear. Transmission problem. 1800.00 repair. Now 2013 exactly 3 years later and car begins same thing all over again. Diagnostic test states needs new transmission. Told these cars have had these problems from the get…
Tl* the contact owns a 2007 mercury mariner. The contact stated that while driving 20 MPH, the overdrive light illuminated. The contact pushed the overdrive button to deactivate the system but the light did not deactivate. The contact also stated that the vehicle stalled while driving and the transmission did not shift in a timely manner. The contact took the vehicle to a dealer for a diagnostic…
Internal transmission failure; needs replacement transmission. Had done all factory recommended services when due including transmission flushes. Transmission should not have failed at this mileage, especially given the fact that car was serviced according to manufacturer specifications. Have had numerous other cars with substantially more mileage and no transmission issues. *tr
My 18 year old son was driving my 2007 mercury mariner, when it started making loud noises and shaking like crazy, he was barely able to keep the vehicle running to get home. When my husband looked at vehicle and saw what it was doing, he thinks the transmission has gone out on it. We had driven the vehicle to church sunday morning (same day) and there was no signs or symptoms of any kind of…
Had powertrain trouble with your 2007 Mercury Mariner?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2007 Mercury Mariner?
It's a documented issue but not catastrophic. 10 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 10 complaints that reported odometer mileage, most powertrain failures cluster between 57,000 and 111,225 miles, with the median around 87,765. A quarter of owners report trouble before 57,000; a quarter make it past 111,225. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Mercury/Mariner.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.