2005 mercury mountaineer cruise control emergency while driving my wife's 2005 mercury mountaineer at approximately 50 MPH and using the cruise control the engine shut off. (dangerous and scary) I immediately placed the engine in neutral and restarted it with no trouble. Fortunately we were on a straight road. The engine shut down appeared to occur because the cruise control de-accelerated…
2005 Mercury Mountaineer cruise control problems
severe 11 complaints filed with NHTSA · avg repair $600 · see cruise control across all vehicles →
Failure mileage
Complaints
11
Recalls
0
Avg fix
$600
3crashes
1injury
When does it fail?
Of the 11 cruise control complaints filed for the 2005 Mercury Mountaineer, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 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
No new NHTSA cruise control complaint has been filed on this vehicle in over 15 years — the issue may be aging out of the active population.
The failure pattern owners describe
Owners report two distinct issues. The first is engine shutdown tied to cruise control: when coasting downhill with cruise engaged at 30–50 mph, the engine RPMs drop too low and the engine stalls. Before shutdown, an audible warning bell sounds and dashboard lights illuminate. Power steering, power brakes, and oil pressure all vanish. Drivers must put the car in neutral and restart it. Multiple owners say they've reproduced the problem reliably on specific hill grades; one found the same issue reported online for Ford Explorers and Mercury Mountaineers. Dealers denied knowing of fixes or recalls.
The second issue is unintended acceleration, unrelated to cruise control. Vehicles accelerate without driver input—sometimes when brakes are applied. One owner's vehicle surged into a garage door at low speed; another accelerated from 70 to over 80 mph on the freeway, with the gas pedal pulling itself down. A third crashed into oncoming traffic while leaving a drive-thru, injuring a passenger. One dealer blamed the driver for pressing brake and gas simultaneously. Owners are understandably afraid to use cruise control after these incidents.
Failure modes owners describe
Engine shutdown on downgrade with cruise control engaged
Engine stalls when cruise control allows RPMs to drop below approximately 400 during coasting on descents, resulting in loss of oil pressure, power steering, and power brakes. Occurs most predictably on slight to moderate downhill grades at 30–50 mph.
When: Downhill coasting at 30–50 mph; mileage varies
Symptoms owners cite: Engine abruptly shuts off; Audible warning bell before shutdown; All or most dashboard lights illuminate; Loss of power steering; Loss of power brakes; Loss of oil pressure; Check gage light illuminates
Repairs/costs cited: Owners report restarting engine restores normal operation; no repair costs cited
Recalls/TSBs owners mention: Dealer stated no known fixes; no recalls found; Internet research by owners shows same issue reported on Ford Explorers and Mercury Mountaineers
Unintended acceleration during normal driving
Vehicle accelerates without driver input, sometimes when brakes are applied. Occurs at low speeds and on freeways. In two incidents, resulted in collisions—one into a garage door, one into oncoming traffic.
When: At speeds from 5 mph to 70+ mph; two collision incidents reported
Symptoms owners cite: Vehicle accelerates without driver pressing accelerator; Acceleration occurs when brakes are applied; Gas pedal pulls itself down (freeway incident); No driver control over acceleration
Repairs/costs cited: One garage-door collision required front-end body repair and door replacement; one freeway collision destroyed vehicle and caused passenger injuries (back, neck, spine); costs not specified
Recalls/TSBs owners mention: Dealer blamed driver (simultaneous brake/gas pedal); no fix offered
Cruise control deactivation or malfunction
Cruise control shuts off abruptly while engaged, or speed control engages erratically, sometimes with lurching. One incident describes car lurching out of control intermittently in reverse and forward with speed control active.
When: Highway speeds (65+ mph) and residential speeds (30–35 mph); specific mileage not cited
Symptoms owners cite: Cruise control disengages unexpectedly; Vehicle lurches forward or backward intermittently; Unpredictable behavior during speed control use
Repairs/costs cited: No repair details provided
Synthesized from 11 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 3 most recent
I purchased a used 2005 mercury mountaineer last month, with 135,400 miles, while using cruise control and traveling approximately 35 MPH, the road went from level to a very slight downgrade. The car then just shut off after audible warning bell was heard. Noticed dashboard lights were all lit and battery gage was normal. I lost power steering, brakes and oil pressure. After pulling safely to the…
Purchased a new 2005 mercury mountaineer in 7/31/2005 the first time the car accelerated when the brakes were applied and the car had to be put in neutral to stop. The dealer reported that there were no known fixes for this problem at this time. The second time while pulling into my driveway when the brakes were applied the car accelerated and crash into my garage door. This time the dealer…
Had cruise control trouble with your 2005 Mercury Mountaineer?
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 cruise control problem on the 2005 Mercury Mountaineer?
It's a meaningful issue. 11 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $600.
At what mileage does the cruise control typically fail?
Across the 10 complaints that reported odometer mileage, most cruise control failures cluster between 23,000 and 105,000 miles, with the median around 48,549. A quarter of owners report trouble before 23,000; a quarter make it past 105,000. 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 $600 for cruise control 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 cruise control?
No active recalls currently cover cruise control 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/2005/Mercury/Mountaineer.
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.