After the engine warms up, upon acceleration and the automatic transmission is shifting gears from 1 to 2, 2 to 3 and 3 to 4 there is a stuttering and often a jerking when the automatic transmission is shifting. This jerking also occurs upon slow braking when the transmission is down-shifting from gears 4 to 3 to 2 to 1. It's getting worse!! *tr
2006 Mercury Montego powertrain problems
moderate 26 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
26
Recalls
0
Avg fix
$2,500
1crash
When does it fail?
Of the 26 powertrain complaints filed for the 2006 Mercury Montego, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 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 31% of every owner complaint on file for this vehicle — the dominant problem area across 10 categories tracked.
Owners have filed 26 powertrain 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.
The failure pattern owners describe
The 2006 Mercury Montego's powertrain is plagued by multiple, distinct failure modes that create genuine safety hazards. The electronic throttle control cuts power unexpectedly and without warning—one owner documented 14 complete power losses on a single 2-hour drive, with check engine and wrench lights coming on each time. Another owner lost all electrical power (lights and engine) at 60 mph, nearly causing rear-end collisions.
The CVT transmission is the most frequent failure point. It slips out of gears, loses fourth gear entirely, refuses to downshift on mountains (forcing brake-only stopping), lurches violently when shifting from Park to Drive, and fails completely at mileages from 50,000 to 189,000 miles. One owner replaced three transmissions in four years. The throttle-to-transmission interface is erratic: light pedal pressure produces no response; harder pressure suddenly triggers multi-gear downshifts with abrupt acceleration and dangerous torque steer. A dealer-reprogrammed interface didn't fix it.
Additional powertrain casualties include rear differential failure requiring complete overhaul and midship bearing failure that caused an axle to separate from the trans-axle during normal driving. Repairs are expensive—transmission work runs $3,000–$6,000, and one owner paid over $3,000 just chasing down a misdiagnosed alternator before discovering the real problem was electronic throttle.
Ford has acknowledged knowing about electronic throttle issues on 2002+ vehicles but refused warranty coverage over 150,000 miles. No recall has been issued despite owner complaints dating back years.
Same Mercury Montego powertrain reports on nearby years: 2005
Failure modes owners describe
Electronic throttle control loss of power
Vehicle suddenly loses power and cannot accelerate despite pedal input. Engine light and wrench light come on. Multiple complete power losses reported during single drives (one owner had 14 losses in 2 hours).
When: 189,000 miles reported; occurs randomly during driving
Symptoms owners cite: Complete loss of power/acceleration; Vehicle jerks and shudders during acceleration; Check engine light and wrench light illuminate; Steering wheel locked in one instance; Difficulty maintaining control in traffic
Codes mentioned: Check engine light, Wrench light (pending code)
Repairs/costs cited: One owner had alternator replaced 3 times (within 1+ month intervals) before learning it was not the cause. Throttle body replacement mentioned by one owner; another shop quoted throttle control transmission failure requiring complete rebuild with new torque converter, valve body, and computer modules.
Recalls/TSBs owners mention: Owner claimed Ford knew about electronic throttle issue on 2002+ vehicles but refused coverage over 150,000 miles due to warranty limit. No recall issued for this condition.
Transmission failure and loss of gears
Transmission loses ability to shift or slips out of gear. Fourth gear missing reported; vehicle will not accelerate or maintains only one speed. Repairs range from valve body replacement to complete transmission rebuild.
When: 50,900 to 189,000 miles; as early as 28,000 miles for drivability issues
Symptoms owners cite: Transmission slips or loses gears; Vehicle will not shift or accelerate; Transmission jerks and shudders during acceleration; High RPM with no speed increase; Harsh or abrupt shifting
Codes mentioned: Transmission diagnostic codes (specific codes not stated)
Repairs/costs cited: One owner replaced entire transmission (used 2007 unit for $475 + $700 labor); problem recurred immediately. Another quoted $3,000+ for transmission rebuild. One shop documented need for new torque converter, valve body, and two computer modules. One owner reported needing three transmissions in four years and quoted $6,000 for another replacement.
Recalls/TSBs owners mention: No recalls identified by dealers for transmission failures. One owner mentioned NHTSA Campaign 12V006000 (powertrain) but vehicle was stated as not included. Dealers offered no assistance or repairs outside warranty.
Erratic acceleration response and throttle lag
Throttle pedal input does not produce proportional acceleration. Light pedal pressure produces no response; firm pressure suddenly causes multi-gear downshift with abrupt acceleration and torque steer. Creates dangerous lurching behavior.
When: As early as 28,000 miles; occurs during normal acceleration attempts
Symptoms owners cite: Delayed throttle response; Sudden multi-gear downshift after lag; Abrupt acceleration with torque steer; Vehicle lurches forward without warning; Unpredictable power delivery
Codes mentioned: Transmission-engine interface program fault
Repairs/costs cited: Dealer allegedly changed transmission-engine program multiple times without resolving issue. No successful repair documented.
Recalls/TSBs owners mention: Dealer reprogrammed transmission-engine interface multiple times without resolving the problem.
Transmission lurching and harsh shifts at low speed
Transmission lurches or jerks violently when shifting from Park to Drive, Neutral to Drive, or Drive to Reverse. Occurs repeatedly and worsens over time. Can cause vehicle to move unexpectedly toward obstacles or people.
When: Present from new in some cases; worsens with mileage; noted as early as 32,000 miles
Symptoms owners cite: Vehicle lurches forward or backward during gear selection; Jerking and clunking sounds; Feels like transmission will drop out; Slips into neutral unexpectedly; Stalls after repeated lurching events; Wrench light illuminates after multiple lurches
Codes mentioned: Wrench light (service required indicator)
Repairs/costs cited: One owner also replaced front engine mount ($475) and full instrument cluster ($1,100) at 36,000 miles. No permanent fix reported.
Recalls/TSBs owners mention: Dealer dismissed complaints as driver error. No recalls or TSBs documented for this issue.
Transmission fails to downshift on grades
Electronic automatic transmission will not manually downshift to lower gears on steep descents. Driver must rely on brakes exclusively, causing severe brake overheating on long mountain grades.
When: Occurs on long mountainous grades (7%-9.5% grades mentioned)
Symptoms owners cite: Unable to downshift to lower gear; Brake overheating on sustained descents; Excessive brake dust accumulation; No engine braking available
Complete electrical failure with engine shutdown
Lights and engine shut off completely while driving at highway speed without warning. Occurs after alternator replacement and battery replacement. Problem recurs within weeks of repair.
When: Occurs randomly while driving; 60 mph reported; recurs after initial repair
Symptoms owners cite: All lights go out; Engine stops running; Vehicle becomes uncontrollable; Nearly caused multiple accidents
Repairs/costs cited: New alternator installed twice; brand new battery installed; all fuses checked and replaced. Repairs cost over $3,000. Problem returned within 4 weeks after initial repair.
Rear differential failure
Rear differential fails and requires complete overhaul. Reported with abnormal noise indicating internal damage.
When: 98,000 miles
Symptoms owners cite: Abnormal noise from rear differential; Differential internal failure
Repairs/costs cited: Dealer recommended complete rear differential overhaul. Vehicle not repaired at time of complaint.
Recalls/TSBs owners mention: Manufacturer notified and offered no assistance.
Midship bearing failure and axle separation
Right front axle came out of trans-axle due to defective midship bearing. Dealer had to cut bearing due to excessive pressure on axle.
When: During normal driving
Symptoms owners cite: Car stopped moving completely; Right front axle separated from trans-axle
Repairs/costs cited: Towed to dealer; defective midship bearing documented on dealer invoice; bearing cut due to excessive pressure.
Synthesized from 26 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
I purchased a new mercury montego premier with a 6 speed electronic automatic transmission. It is an excellent vehicle with the exception that while traveling down steep grades there is no way to downshift to a lower gear to slow the vehicle down. I have to rely on the brakes only and they overheat on long mountainous grades. Some are 7% to 9.5% grades in weatern n.c. ,northern ga. , and eastern…
While traveling down the road the lights went out in the car quit running at 60 miles per hour was almost rear-ended knocked up steering wheel ended up in the ditch. Had a new alternator put on twice a brand new battery had all the fuses checked everything redone 4 weeks later same thing all over again electrical problem with your car, this time being more alert of it I was able to pull over and…
When accelerating I noted the tranny started to slip, I drive very cautious, not a speedster, I watched the RPM shoot to five and no speed shift, I drove the car for a while hoping it would come out of it, I was driving back and fourth some 4000 miles to work and had little time to get to mechanics finally my wife took it in they said 4 gear was missing in tranny, just getting back to work I had…
I have a 2006 mercury montego AWD. At slow speeds the transmission seems to lurch in both drive and reverse. It has been doing this since brand new. It has 65,000 miles on it now and it seems to be worsening with age. On october 20th, 2010 the slow speed lurch in reverse caused the vehicle to back into a pole causing body damage to the decklid and bumper. *tr
1. Normal driving. Car stopped moving. Stranded xmas evening in rain storm. 2. Rt. Frond axle came out of trans-axle towed to dealer. 3. Found defective midship bearing had to cut due to excessive pressure on axle. Per dealer invoice. *tr
Had powertrain trouble with your 2006 Mercury Montego?
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 2006 Mercury Montego?
It's a documented issue but not catastrophic. 26 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 19 complaints that reported odometer mileage, most powertrain failures cluster between 60,000 and 98,000 miles, with the median around 80,000. A quarter of owners report trouble before 60,000; a quarter make it past 98,000. 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 $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/2006/Mercury/Montego.
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.