FORD/MERCURY: IF DIAGNOSTIC CODE B2278 IS STORED IN POWER STEERING CONTROL MODULE (PSCM), IT NEEDS REPLACING WITH TORQUE SENSOR SERVICE KIT THAT IS AVAILABLE AND IF NOT, DOES NOT APPLY. MODEL 2008-2012 ESCAPE, 2008-2011 MARINER.
full bulletin at NHTSA ↗2011 Mercury Mariner steering problems
moderate 20 complaints filed with NHTSA · avg repair $700 · see steering across all vehicles →
Failure mileage
Complaints
20
Recalls
0
Avg fix
$700
When does it fail?
Of the 20 steering complaints filed for the 2011 Mercury Mariner, here's the actual mileage breakdown — failures cluster heaviest at 125,000-150,000 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
Steering accounts for 23% of all owner complaints filed against this vehicle, across 7 categories tracked.
No new NHTSA steering complaint has been filed on this vehicle in over 5 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering steering on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of the 2011 Mercury Mariner consistently report sudden, unpredictable loss of power steering assist—the steering wheel becomes extremely hard to turn or locks up completely. Failures happen at highway speeds and while parking, sometimes with no warning light until the failure is underway. Several owners had the vehicle serviced under Ford's 2014 recall (14V-284) for this exact problem, where dealers applied a software update intended to alert drivers to imminent sensor failure. Despite the recall work, the power steering has failed again, often within months or a year or two, leaving owners facing $500–$2,000 sensor replacement costs that Ford refuses to cover. Multiple owners reported their VIN was not flagged for the recall despite the vehicle matching the recall criteria (manufacture date and symptoms). One owner's steering column seized while turning at 35 mph, and another's failed at 40 mph; a third experienced the steering wheel locking unexpectedly. Dealers and Ford customer service have cited the one-time-only nature of the recall and dismissed post-service failures as outside the program's scope. Owners express frustration that a software reprogram cannot cure a defective physical component and that the lack of an actual fix leaves them with a safety hazard.
Same Mercury Mariner steering reports on nearby years: 2008 · 2009 · 2010
Failure modes owners describe
Torque Sensor Failure – Power Steering Loss
The steering torque sensor fails, causing complete or near-complete loss of power steering assist. Owners report the steering wheel becomes extremely difficult or impossible to turn, and the electric power steering system shuts down. This can happen suddenly with no warning, creating a serious safety hazard at highway and low speeds alike. Repair requires replacing the faulty torque sensor.
When: Typically 91,000–200,000+ miles; failures reported occurring after recall-related software updates.
Symptoms owners cite: Sudden loss of power steering assist; Steering wheel becomes very difficult to turn; Steering wheel seizes or locks completely; Power steering warning light or 'power assist fault' code appears on instrument panel; Some owners report no warning before failure
Codes mentioned: B2278, Power assist fault code
Repairs/costs cited: Torque sensor replacement costs $500–$600 at independent mechanics; some dealers quote as high as $1,500 for full steering column replacement if secondary damage occurs. Owners cite ~$2,000 in some cases.
Recalls/TSBs owners mention: Recall 14V-284 (Ford 14S05) addresses this issue via torque sensor reprogramming or replacement. However, recall covers only pre-failure sensor replacement. If a sensor fails after the 2014 recall reprogramming was completed, Ford has informed owners the recall does not cover the replacement. The reprogramming was intended to provide an imminent-failure warning, not to fix the defect itself. Multiple owners report the warning feature failed to alert them before failure.
Steering Column Structural Failure
The steering column itself fractures, breaks, or seizes internally. When this occurs alongside or separately from torque sensor issues, the steering becomes immovable and requires complete column replacement. One owner reported seizing with a loud abnormal sound; another struck a curb when steering ability suddenly seized.
When: Reported at 129,000–147,500 miles.
Symptoms owners cite: Loud abnormal sound from steering column; Steering column seizes completely; Steering wheel becomes impossible to turn; Physical damage to vehicle from inability to steer
Repairs/costs cited: Full steering column replacement required. Costs reported as high as $1,530 or more depending on extent of damage.
Recalls/TSBs owners mention: Manufacturer stated no recall applies to this failure mode.
Intermittent Power Steering Assist Dropout – Recurrent Failure After Recall Service
Some owners had the 2014 recall performed (software update and/or sensor reprogramming), but the power steering assist problem recurs shortly after. The vehicle periodically loses assist without warning, then may restore function after restart. This intermittent failure pattern violates the expectation that the recall repairs the defect.
When: Failures recur months to years after initial recall service; mileage approximately 125,000–145,000 when recurrence reported.
Symptoms owners cite: Intermittent loss of power steering assist; Steering wheel becomes difficult to turn intermittently; Power steering warning light illuminates; Function may restore after vehicle restart; No warning before initial failure in some cases
Repairs/costs cited: Torque sensor replacement required; costs $500–$2,000 depending on complexity. Owners bear full cost if manufacturer denies coverage as 'one-time recall repair.'
Recalls/TSBs owners mention: Manufacturer has informed owners that the 2014 recall is a one-time repair and will not cover subsequent failures of the same component. Ford has also denied coverage on some vehicles where one diagnostic code was addressed under the recall but a different fault code (also listed in the recall bulletin) later appears.
Steering Responsiveness Degradation – Difficult Turning
The steering wheel becomes progressively harder to turn in either direction, sometimes with noise in the steering column. The difficulty may persist or recur intermittently. This can occur at any speed and creates a hazardous condition, particularly for elderly or physically limited drivers.
When: Reported at 40 mph, 45 mph, 60 mph, and complete stops; mileage range 91,000–170,000.
Symptoms owners cite: Steering wheel difficult to turn in either direction; Noise or grinding sound in steering column; Steering wheel shakes; Difficulty turning corners or making parking maneuvers; Failure sometimes cannot be reproduced by technicians
Codes mentioned: Torque angle steering sensor fault
Repairs/costs cited: Diagnosed as torque angle steering sensor failure; replacement typically $500, though some owners faced higher quotes if structural damage suspected.
Recalls/TSBs owners mention: Not covered under the recall if the VIN was not explicitly included in recall records, even though symptoms and vehicle manufacture date match recall criteria.
Synthesized from 20 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
I'm very upset and on the verge of tears! My steering wheel suddenly locked on me! I almost wrecked! This has happened a few times & I have no warning light on my dashboard
Driving at 40 MPH car stalls, pull over, car starts up engine lite on, (sat) take to dealer on mon (12/15/2014), explain to dealer, they call 3 hours later to say "purge valve needs to be replaced"ok this should be covered right? She says no! The cost to you will be $320.33. I told her this is part of the emissions, it has to be, she said no its not! I purchased this car from this dealer 3 1/2…
Power steering assist will go out without warning causing the car to lose it's power steering and may even lock up totally.this has happened repeatedly since june of 2017 and has gotten progressively worse. We had to repair it in december of 2017 at a cost of $1500.00.
Tl* the contact owns a 2011 mercury mariner. While driving approximately 60 MPH, the steering ability became very difficult. The contact decreased the speed and drove home. The dealer was not notified. The manufacturer was notified of the failure. The vehicle was not diagnosed or repaired. The approximate failure mileage was 91,000.
Tl* the contact owns a 2011 mercury mariner. The contact stated that the vehicle experienced intermittent power steering assist failure with an unknown warning light illuminated on the instrument panel. The vehicle was taken to an independent mechanic who informed the contact that there was a recall on the vehicle for the power steering assist failure. The vehicle was then taken to bright bay…
I was driving my vehicle at a low rate of speed on a city street on 10/16/15 and as I turned a corner, about to pull into a driveway, there was a complete loss of power steering ! The vehicle was very difficult to control and it took all my strength in both arms to complete the turn and pull into the driveway safely. The vehicle was towed to crest Ford dealership in flat rock, mi and the…
Had steering trouble with your 2011 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 steering problem on the 2011 Mercury Mariner?
It's a documented issue but not catastrophic. 20 complaints have been filed. Repairs average $700 and most owners catch it before it causes a breakdown.
At what mileage does the steering typically fail?
Across the 18 complaints that reported odometer mileage, most steering failures cluster between 102,000 and 147,500 miles, with the median around 129,000. A quarter of owners report trouble before 102,000; a quarter make it past 147,500. 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 $700 for steering 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 steering?
No active recalls currently cover steering 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/2011/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.