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 ↗2010 Mercury Mariner steering problems
severe 62 complaints filed with NHTSA · avg repair $700 · see steering across all vehicles →
Failure mileage
Complaints
62
Recalls
0
Avg fix
$700
1crash
6injuries
When does it fail?
Of the 62 steering complaints filed for the 2010 Mercury Mariner, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 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
Owners have filed 62 steering complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 5 model years of Mercury Mariner in our records for steering problems, this one ranks #3 by owner-complaint volume.
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 ↗FORD/MERCURY: CLUNK NOISE AT STEERING; STOPS DURING FIRST LOCK TO LOCK CYCLE. THE NOISE TYPICALLY OCCURS DURING TIGHT PARKING LOT MANEUVERS. THE CLUNK NOISE HEARD ON THE FIRST STEERING LOCK TO LOCK CYCLE IS A NORMAL CHARACTERISTIC OF THE SYSTEM.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners describe abrupt power steering failure ranging from intermittent dropouts lasting seconds to complete, permanent loss of assist. The steering wheel locks, becomes rock-hard to turn, or seizes without warning—happening at idle, during turns in parking lots, on highways at 60+ mph, and even while backing out of driveways. The "Power Steering Assist Fault" warning light typically appears before or during failure. Some failures are preceded by steering wheel vibration or twitching.
Ford issued Recall 14S05 in July 2014 to reprogram the power steering control module (PSCM) and recalibrate the torque sensor. Many owners report the software update did not fix the underlying hardware defect, and the power steering failed again months or years later—sometimes within days of the recall service. Owners who return to dealerships after a repeat failure are denied coverage because Ford claims: the recall ended, too much time has passed, the VIN was not originally included, or the vehicle was already inspected.
A major complaint is VIN exclusion. Owners whose vehicles match the model year and manufacturing timeframe report their specific VIN is not in the recall database, even though they have identical faulty components and experience the identical failure the recall addresses. Repair costs range from $800 to $1,600 for torque sensor or steering column replacement. At least one owner reported the cascading damage—after power steering loss caused an accident, secondary repairs (suspension, alignment, electrical) exceeded $4,000 total.
Same Mercury Mariner steering reports on nearby years: 2008 · 2009 · 2011
Failure modes owners describe
Power steering assist loss / steering wheel lock-up
Power steering assist suddenly fails or steering wheel becomes extremely difficult to turn or locks without warning. Owners report the steering wheel becoming stiff, requiring excessive force to maneuver, or seizing completely. This occurs at various speeds including highway (60-75 mph) and low speeds (parking/5 mph turns). The failure is often preceded by a 'Power Steering Assist Fault' warning message on the instrument panel.
When: Failures reported from 28,000 miles to 201,000 miles; many occurring years after the recall was performed in 2014
Symptoms owners cite: Power steering assist warning light illuminates; Steering wheel becomes stiff or locks; Excessive force required to turn wheel; Power steering stops working mid-drive; Steering wheel seizure without warning; Loss of power steering on restart or after brief shutdown
Codes mentioned: P2111 (throttle body system open - reported in one case), Torque sensor failure, PSCM (Power Steering Control Module) malfunction
Repairs/costs cited: Dealers diagnose faulty torque sensor (approximately $800–$1,600 for replacement), steering column assembly replacement, or electric power steering pump replacement. Some owners were told parts were on backorder with no repair date available. Owners cite repair costs of $800 to $1,600.
Recalls/TSBs owners mention: Recall 14S05 / 14S05C (July 2014 start, no end date) and NHTSA Campaign Numbers 14V284000 and DP15001. Recall remedy involved software update/reprogram of PSCM and torque sensor recalibration. Many owners report Ford denies coverage because: (1) vehicle VIN not included in recall despite matching year/make/model, (2) too much time elapsed since recall start date, (3) vehicle already inspected/serviced under recall so not covered again, (4) parts on backorder with no timeline. Multiple owners report the software-only fix did not resolve the underlying hardware (torque sensor) failure and the problem recurred.
Steering wheel vibration / twitching at idle
Steering wheel tremors, shakes, or twitches while the vehicle is running at idle or during light driving. Owners describe high-speed vibration and uncontrollable shaking of the steering column, along with accompanying noise.
When: Reported after software recall update was performed; progressive worsening noted before complete failure
Symptoms owners cite: Steering wheel twitching or trembling at idle; Uncontrollable vibration of steering column; Shaking/vibrating steering wheel at high speed; Weird noises accompanying steering vibration; Steering gradually becoming harder to turn before total failure
Repairs/costs cited: One owner reported the dealership software update in December 2018 triggered the twitching; power steering failed completely 2 days after visiting the dealership for the recall fix. Owners did not report specific repair costs for this symptom alone.
Recalls/TSBs owners mention: Some owners report the software update (reflash of PSCM) actually caused or triggered the steering problems rather than fixing them. Ford told one owner the software update was the 'fix' and would not perform additional repairs. No warranty or recall coverage offered after software was applied.
Cascading electrical / mechanical failures from steering malfunction
Power steering failure triggers or exacerbates secondary vehicle failures including suspension issues, starter problems, belt fraying, AC compressor damage, alignment problems, and electrical gremlins (window, dome light, blower, A/C malfunction). One owner reported a complete engine shut-down and emergency rollover incident down a 20-degree slope due to loss of steering.
When: Related to primary steering failure; secondary failures develop after steering loss incapacitates the vehicle or forces unsafe driving
Symptoms owners cite: Rough ride / suspension noise after steering failure; Starter issues following steering failure; AC compressor failure and belt fraying; Alignment problems caused by hard steering; Window and dome light intermittent failure; A/C and blower malfunction; Engine stall during steering failure event; Overall vehicle instability and safety hazard
Repairs/costs cited: One owner reported over $4,000 in cumulative repairs including throttle casing module, restraint control module, acceleration pedal work, and steering/suspension repairs after a steering failure accident. Another reported combined medical and vehicle repair costs of $23,350 following a rollover incident. Most owners did not pursue diagnosis/repair of secondary failures because primary steering issue remained unresolved.
Recalls/TSBs owners mention: No manufacturer response documented; owners bore all repair costs for secondary failures stemming from the primary steering defect.
VIN exclusion from recall coverage despite matching vehicle specs
Vehicle matches the year, make, model, and manufacturing date range of the recall but the specific VIN is not included in the recall database. This creates a situation where the owner has a vehicle with identical components and the identical failure described in the recall but receives no manufacturer support because the VIN fell through a record-keeping gap or was selectively excluded.
When: Discovered when owners attempt to claim recall coverage after experiencing symptoms; manufacturing timeframes align but VINs excluded
Symptoms owners cite: Power steering assist fault; VIN not showing in NHTSA recall database for vehicle's year/make/model; Dealership confirms vehicle was built during recall period but VIN excluded; Owner informed recall has ended or VIN never eligible
Repairs/costs cited: Owners told they must pay full replacement cost ($800–$1,600 for torque sensor/steering repair) because VIN is not in the recall. One owner reported being informed Ford only recalled a fraction of vehicles with this faulty part, creating a 'lottery' system.
Recalls/TSBs owners mention: Ford confirms VIN not included in Recall 14S05, 14S05C, NHTSA Campaign 14V284000, or NHTSA Action DP15001. Manufacturer refuses to extend recall coverage to vehicles manufactured during the recall period if their specific VIN was not recorded in the recall database. No alternative assistance programs offered to affected owners.
Synthesized from 62 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 7 most recent
Tl* the contact owns a 2010 mercury mariner. The contact stated that the steering wheel seized the vehicle had to be turned off and restarted to reset the computer. The dealer was notified the VIN was excluded from NHTSA campaign number: 14v284000 (steering). The contact was uncertain of when the vehicle would be repaired. In addition, the contact was included in NHTSA campaign number: 16v777000…
The contact owns a 2010 Mercury Mariner. The contact stated that after starting the vehicle, the message "Power Steering Assist Failure" was displayed, and the steering wheel became extremely difficult to turn in either direction. The local dealer and manufacturer were notified of the failure, but no assistance was provided. The contact was informed that the vehicle was previously repaired under…
The contact's mother owns a 2010 Mercury Mariner. The contact stated while her mother was driving 45 mph, the steering wheel became difficult to turn. The driver stated the tire pressure and the power steering warning lights were illuminated. The driver was able to park the vehicle on side of the road. The owner took the vehicle to the independent mechanic and associated the failure with NHTSA…
Tl* the contact owns a 2010 mercury mariner. While driving approximately 15 MPH, the power steering suddenly failed and the steering wheel became very difficult to turn in either direction. The failure was not diagnosed or repaired. The manufacturer and local dealer (dunphy Ford, 7700 frankford ave, philadelphia, pa) were notified of the failure, but no assistance was offered. The failure mileage…
Was slowing to turn in shopping plaza lose power steering almost ran women over cross drive way car would not steer without much force this is dangerous how many must die before Ford fixes this do they remember gas tanks ? My next call is to 60 minutes .
When I am driving turning the wheel it make a loud clicking sound
Original owner: the vehicle would was parked without issue yesterday. Backed it up this morning and there was no power steering. Shut it off and tried again and there was still no power steering. On the third attempt, the power steering returned and I very cautiously drove it to the dealership. There were no error messages displayed or warnings while it was out. (change oil reminder was lit).…
Had steering trouble with your 2010 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 2010 Mercury Mariner?
It's a meaningful issue. 62 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $700.
At what mileage does the steering typically fail?
Across the 49 complaints that reported odometer mileage, most steering failures cluster between 85,000 and 132,000 miles, with the median around 110,000. A quarter of owners report trouble before 85,000; a quarter make it past 132,000. 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/2010/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.