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 ↗2008 Mercury Mariner steering problems
moderate 297 complaints filed with NHTSA · avg repair $700 · see steering across all vehicles →
Failure mileage
Complaints
297
Recalls
0
Avg fix
$700
4crashes
4injuries
When does it fail?
Of the 297 steering complaints filed for the 2008 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.
How fast does it fail?
Cumulative share of the 13 mileage-bearing steering complaints filed against the 2008 Mercury Mariner by each odometer reading. Median failure: 125,000 mi.
10% have failed by96,000 mi
Half the fleet by125,000 mi
90% have failed by220,000 mi
Curve based on owner-reported odometer mileage at the time of complaint. Reflects when owners filed, not when symptoms first appeared. Maintenance habits and driving conditions shift the curve.
What stands out
Of the 5 model years of Mercury Mariner we track for steering problems, this one carries the most owner complaints on file — 297.
Steering accounts for 64% of every owner complaint on file for this vehicle — the dominant problem area across 10 categories tracked.
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.
FORD/MERCURY: STEERING COLUMN POP/CLUNK NOISE ON TURNS. SOME VEHICLES MAY EXHIBIT A POP OR CLUNK NOISE FROM THE STEERING COLUMN AREA WHILE TURNING. THIS NOISE TYPICALLY OCCURS QUARTER TURN BEFORE THE STEERING WHEEL REACHES IT'S END OF TRAVEL STOP AND TYPICALLY GOES AWAY WITH WEIGHT OFF THE WHEELS.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of the 2008 Mercury Mariner describe sudden, complete loss of power steering assist while driving at highway speeds and low speeds alike—sometimes with no warning at all. The steering wheel becomes rock-hard and requires extreme physical force to turn. The failure often restores after turning the engine off and restarting, but it recurs randomly. A dashboard warning light labeled "Power Steering Assist Fault" or "Power Steering Assist Failure" typically illuminates.
Between 2014 and 2015, Ford issued recall 14S05 (NHTSA 14V284000) due to a faulty torque sensor in the electronic power steering system. The recall remedy was a software update only. However, owners report the update failed to prevent the same power steering losses—with failures happening 29 days to 2+ years after the recall service. Some owners also report steering wheel vibration, shaking, and grinding noises from the steering column, especially after the recall was performed.
Dealers diagnose the underlying cause as torque sensor failure (diagnostic code B2278) requiring full steering column replacement, typically quoted at $800–$2,385. Ford and its dealers have closed the recall and deny responsibility for post-recall failures, telling owners the software update completed Ford's obligation. One owner reported receiving contradictory information from Ford customer service—first told there was a 12-month warranty on the recall repair, then told there was no warranty. Some vehicles' VINs do not appear in the recall database despite showing identical symptoms, leaving those owners with no recourse at all.
Owners express alarm at the safety risk, noting they have read hundreds of similar complaints online and feel Ford is knowingly neglecting a widespread defect that puts lives in danger.
Same Mercury Mariner steering reports on nearby years: 2009 · 2010 · 2011
Failure modes owners describe
Power steering assist loss / reversion to manual mode
Electronic power steering (EPAS) cuts out intermittently or completely, reverting vehicle to manual steering mode requiring extreme physical effort to turn the wheel. Failure often occurs without warning during highway driving, low-speed maneuvering, or while stopped. Some owners report power steering restores after turning engine off and restarting.
When: Throughout vehicle ownership; failures reported from 77,000 to 200,600 miles. Many failures occur months or years after recall service performed in 2014-2015.
Symptoms owners cite: Sudden loss of power steering assist while driving at various speeds (35-95 MPH); Steering wheel becomes extremely stiff and difficult to turn, requiring excessive physical force; Intermittent power steering loss that restores after engine restart; Power steering assist fault warning light illuminates on dashboard; Loss of steering assist detected by code B2278 (steering shaft torque sensor fault); Chime or wrench warning indicator on message center (in some cases)
Codes mentioned: B2278, P2111, P2112
Repairs/costs cited: Owners cite replacement of steering column assembly (quoted $800-$2,385), torque sensor replacement ($545-$700), or motor/column replacement ($912-$1,500). One owner resolved intermittent loss with battery replacement.
Recalls/TSBs owners mention: Recall 14S05 / NHTSA 14V284000 (July 2014) performed software update to power steering control module (PSCM) and instrument cluster. Recall description states if vehicle shows history of torque sensor loss or fault codes, affected components will be replaced free. However, Ford dealers and customer service deny coverage for failures occurring after software-only remedy, citing recall as closed. Ford states 12,000 mile / 12-month warranty on recall repair in some instances, but contradicts this in other communications. Many owners report Ford refuses coverage stating 'recall was closed' or software update completed responsibility.
Steering wheel vibration, shaking, and chattering
Steering wheel vibrates, shakes, or chatters violently, particularly when stopped at idle, during braking, or while driving at normal speeds. Grinding or clunking noises emanate from steering column. Vibration may be intermittent or persistent and sometimes accompanies power steering loss.
When: Often emerges shortly after recall software update (days to weeks) or independently during vehicle ownership; reported from early mileage to high mileage vehicles.
Symptoms owners cite: Steering wheel shakes or vibrates violently when vehicle is idle or stopped; Steering wheel pulsates or trembles while driving; Loud grinding, clunking, or chattering noise from steering column; Grinding sounds at bottom of steering column while driving; Column motor chatter detected upon diagnostic; Steering wheel vibration that can be felt while driving normal speeds
Codes mentioned: B2278, B1342-2F
Repairs/costs cited: Owners cite need for steering column replacement ($800-$2,385) or steering gear replacement. Some owners report vibration began immediately after recall software update but dealers claim vibration is unrelated to recall and not covered.
Recalls/TSBs owners mention: Recall 14S05 software update does not address vibration symptoms. Ford/dealers inform owners vibration is separate from recall issue and owner responsibility. One dealer acknowledged vibration coincided with bad torque sensor but stated it falls outside recall scope.
Inadequate recall remedy and repeated failures post-recall
Software-only recall update (14S05) fails to prevent or resolve power steering loss, with same failures recurring within weeks to months after recall service completion. Many owners report the 2014 software update either did nothing, made the problem worse, or only provided warning indicators rather than fixing the underlying torque sensor defect.
When: Failures post-recall reported as early as 29 days to 2+ years after software update performed in 2014-2015.
Symptoms owners cite: Power steering loss recurs after recall service despite software update; Steering wheel shaking begins immediately after recall software update; Power steering assist fault warning appears on dashboard post-recall; Multiple failures of same symptom within months of recall remedy; Owner reports recall did not prevent the problem as advertised
Codes mentioned: B2278
Repairs/costs cited: Recall remedy cost owners nothing upfront, but subsequent failures require full steering column replacement ($800-$2,385) at owner expense. One owner reports $1,300 column replacement 29 days post-recall.
Recalls/TSBs owners mention: Recall 14S05 literature states software update 'may' extend time steering assist is maintained and provides driver awareness via chime/wrench light. Ford's July 1, 2014 dealer bulletin (Q&A) explicitly states: 'ANY SUBSEQUENT LOSS OF ASSIST REPAIRS EXPERIENCED AFTER COMPLETION OF MODULE REPROGRAMMING ARE NOT COVERED BY THIS RECALL' and 'REPLACEMENT OF THE STEERING COLUMN OR TORQUE SENSOR IS AT THEIR EXPENSE.' Dealers claim recall is 'closed' after software update and refuse further warranty coverage. Ford customer service denies responsibility citing prior recall service. Multiple owners report Ford supervisor stated there is no extension of recall warranty.
VIN exclusion from recall coverage
Some 2008 Mercury Mariner vehicles experience identical power steering failures described in recall 14S05 (NHTSA 14V284000) but owner VINs are not included in the recall database, leaving them ineligible for any remedy despite exhibiting the exact same defect.
When: Vehicle failures occur; VIN exclusion discovered when owners attempt to use recall.
Symptoms owners cite: Power steering assist loss identical to recall symptoms; Torque sensor fault codes (B2278) identical to recalled vehicles; Dealer confirms failure matches recall description but states VIN not in recall list
Codes mentioned: B2278
Repairs/costs cited: Owners must pay full repair cost ($1,300-$2,385) for identical defect despite recall existing for same vehicle model and issue.
Recalls/TSBs owners mention: Dealer and manufacturer state VIN not included in NHTSA Campaign 14V284000. One dealer acknowledged symptom matched recall but VIN exclusion prevents coverage. Ford customer service offers no remedy for VIN-excluded vehicles experiencing the recalled defect.
Steering column mechanical wear from failed torque sensor
When torque sensor fails to function, the steering column shaft and lower U-joint experience accelerated wear and damage. Dealers diagnose need for steering column replacement citing mechanical wear, which they distinguish from electronic components and deny recall coverage.
When: Discovered at time of steering failure diagnosis.
Symptoms owners cite: Steering shaft and lower U-joint show excessive wear; Mechanical components of steering column damaged or faulty
Repairs/costs cited: Full steering column replacement required ($800-$2,385).
Recalls/TSBs owners mention: Recall 14S05 dealer bulletin indicates recall only applies to electronic components (software and torque sensor), not mechanical ones. Dealers deny coverage for steering shaft/U-joint replacement citing mechanical wear falls outside recall scope, despite wear being direct result of electronic sensor failure.
Synthesized from 297 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 15 most recent
The contact owns a 2008 Mercury Mariner. The contact received notification of NHTSA Campaign Number: 14V284000 (Steering). The contact took the vehicle to a local dealer and had the recall repair completed. The vehicle was not repaired. The contact stated that on December 27, 2022, while exiting her garage porch the steering wheel became difficult to turn. The contact stated no warning light was…
Lost power steering as I was driving through a parking lot. Saw the message on the dash "power steering assist fault". Called Ford dealership to get my vehicle looked at but they are booked 2 weeks full. Asked about recall 14s05 but they told me my VIN was not part of the recall. I contacted Ford and they gave me the same information. Can not drive vehicle as it is too dangerous in winter. This…
The contact owns a 2008 Mercury Mariner. The contact stated that while driving at 55 -60 MPH, the power steering failed. The steering wheel became increasingly difficult to maneuver. The vehicle was turned off while the contact inspected the vehicle. The vehicle was restarted but a short distance afterwards the failure reoccurred. No warning lights illuminated. The contact called the dealer who…
Power steering intermittently goes out like thousands of others escapes and mariners. This happens randomly.
My car is well maintained. I do everything to keep it running well and now the power steering only works half the time. It is now also making a clunking noise in the steering wheel column and the wheel will shake on its own while in park. I have read lots of complaints about this same problem on many I these vehicles and something needs to be done! $1300 is a ton of money to pay to have a…
Tl* the contact owns a 2008 mercury mariner. The contact stated that while approaching a stop sign, the steering wheel seized. The failure occurred on several occasions. The vehicle was taken to a dealer where it was diagnosed that the torque needed to be replaced. The vehicle was not repaired. The contact stated that the vehicle was previously repaired under NHTSA campaign number: 14v284000…
Tl* the contact owns a 2008 mercury mariner. While backing out of the driveway, the power steering suddenly failed and the steering wheel became very difficult to turn in either direction. The vehicle was taken to an independent mechanic who diagnosed that the steering torque sensor was faulty and needed to be replaced. The vehicle was not repaired. The vehicle was then taken to the local dealer…
Tl* the contact owns a 2008 mercury mariner. While driving approximately 25 MPH and making a left turn, the steering wheel seized and became difficult to maneuver. The contact coasted the vehicle to the side of the road, waited a couple of minutes, and resumed driving. The vehicle was taken to the dealer where it was diagnosed that the epa steering gear box failed and needed to be replaced. The…
Steering wheel will freeze up while driving. Steel on steel horrible noise when driving. Shifter gets stuck have to put it in neutral to start it. *tr
Tl* the contact owns a 2008 mercury mariner. The contact stated that while driving at 2 MPH, the steering wheel seized. The vehicle was taken the dealer where it diagnosed that the torque sensor needed to be replaced. The vehicle was not repaired. Prior to this failure the vehicle had a software update under NHTSA campaign 14v284000 (steering). The manufacturer was notified of the failure. The…
Had steering trouble with your 2008 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 2008 Mercury Mariner?
It's a documented issue but not catastrophic. 297 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 252 complaints that reported odometer mileage, most steering failures cluster between 95,500 and 150,000 miles, with the median around 123,625. A quarter of owners report trouble before 95,500; a quarter make it past 150,000. 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/2008/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.