This is a serious safety hazard that could result in death or injury. If I hadn’t escaped in time, I would have been killed. I am urging the federal safety agency to investigate this defect and take immediate action to remove these vehicles from the road. Others may not be as lucky. This issue is life-threatening, especially because the fire started while the vehicle was in motion. These vehicles must be recalled and removed from use before more people are injured or killed.
2005 Mercury Grand Marquis acceleration problems
39 complaints (8% of all complaints for this car). Typical mileage when it fails: 18,000. 13 crashes reported.
- owner complaints
- 39
- of this car's complaints
- 8%
- typical mileage
- 18,000
- crashes
- 13
- recalls
- 0
Which part fails
- Accelerator pedal3
- Cruise control2
At what mileage
Complaints by mileage at the time of the problem.
0k-25k
25k-50k
50k-75k
75k-100k
100k-125k
125k-150k
150k-175k
175k-200k
200k+
Mercury Grand Marquis acceleration problems in other years
Specific symptoms reported on the 2005 Mercury Grand Marquis acceleration
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Related recalls
No recalls on record for this model year.
What 2005 Mercury Grand Marquis owners say
Most recent owner complaints, unedited.
On [XXX] I was driving this recently purchased Grand marquis . On [XXX] here in San Antonio around ten at night I hit the brakes and something under the hood compartment blew up and it cocked the car . I was trapped inside and when I finally was able to get my seatbelt released I had to break the window with my head . The previous week I reached out to ford and they told me they would address the issue and that they would call me back and that was to no avail. i reached out to ford and at first I was told I would be helped and then a man came on the phone yelling that my vehicle . I need help with resol this issue . My car is totaled and I’m hurting and it’s because of a car with recalls that are a fire haz and dangerous to be put on the road Thank you and God Bless . was not under any recalls The car had been parked for over ten years beca when the orig owner bought it it had issues with the cruise control and the brakes and the engine and the lights . I investigated about and hazards the car was demonstrating and upon further consideration my instinct told me this car was defected and was a big problem waiting to happen INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
I was driving I pressed the cruise control to set it but the vehicle kept accelerating and as I was pressing on the brake it wouldn’t disengage it kept accelerating I kept pressing the brake frantically and THANK GOD it disengaged.. I never touched the cruise control again
Tl* the contact owns a 2005 mercury grand marquis. While driving 45 MPH, the contact attempted to brake, but the vehicle accelerated. The contact shifted the transmission into neutral and the vehicle stopped. The engine continued to rev for awhile and then the rpms slowed down to a normal level. The contact stated that the symptoms disappeared on their own and the vehicle operated without any failures since. The manufacturer stated that there was no recall for the failure. The failure mileage was 79,000. *bf
The vehicle will not disengage cruise when applying the brakes at 50 MPH on the highway. In fact it will continue to accelerate until I hit the brakes hard. I have recently disconnected the system, what a shame. I am the 2nd owner. I purchased this vehicle in sept 2017 with only 20,109 miles.
This has been a dangerously recurring engine accelerating problem while at rest or moving/coming to a stop on streets or highways but always while attempting to brake or hold in place. The brakes won't stop it, only turning off the ignition and restarting works. Barely avoided several accidents, so far. My ford dealer has inspected the systems and my foot placements with out finding a problem or a solution. There are over 30 complaints regarding this problem in your database, some with serious injuries. After all these years, how can this issue be escalated before there is a fatality? Please respond asap.
Tl* the contact owns a 2005 mercury grand marquis. While driving approximately 5 MPH and then depressing the brake pedal to slow the vehicle down, the vehicle accelerated without warning. To avoid crashing into the preceding vehicle, the contact was able to veer to the right and continue driving. There was no warning indicator illuminated. The failure recurred three times. The vehicle was taken to porter ford (600 ogletown rd, newark, de 19711) where it was diagnosed that the throttle body motor assembly was sticking and needed to be replaced. The vehicle was repaired. The manufacturer was not contacted. The approximate failure mileage was 39,000.
Vehicle at times with my foot on the brake pedal,just starts to accelerate for no reason when I stop a light or in traffic.
Tl* the contact owns a 2005 mercury grand marquis. The contact stated that while stopped at a traffic light, the vehicle accelerated independently. The contact stated that it became difficult to keep the vehicle from moving forward. The contact stated that the brake pedal was depressed but failed to stop the vehicle. The contact was able to slow the vehicle by placing the shift lever to the neutral position. The vehicle was not taken to be diagnosed or repaired. The contact stated that the failure was intermittent. The manufacturer was notified of the failure. The approximate failure mileage was 146,784. Updated 01/05/17*lj
Unintended accel. Sometimes when I step on the brake the car accelerates instead. At first I thought it was me and my big feet. After some internet research I find it may be common as the 2005 gets older. I asked if brke pedal could be adjusted so that there was no interference with the gas pedal, I was told no. I had the master cylinder replaced, minimum improvement. One day I "shot" across us19 in ross township when I braked. Instead of stopping at a red light, I kept going until I cleared traffic in both directions ruining 2 wheels & tires - subsequently repaired. The car now sits in our driveway, after some other occurrences without incident. I'm leary of driving it & don't want to sell it & get someone injured or killed. Fortunately I have a 2004 sable which I drive daily with no such problems! Ideas?
Questions about the 2005 Mercury Grand Marquis acceleration
Does the 2005 Mercury Grand Marquis have acceleration problems?
Owners have filed 39 complaints about the acceleration of the 2005 Mercury Grand Marquis, 8% of all its complaints.
At what mileage do 2005 Mercury Grand Marquis acceleration problems start?
The typical (median) mileage in owner complaints is 18,000 miles.
Was there a recall on the 2005 Mercury Grand Marquis acceleration?
There is no recall for this problem on this model year.
What year does the Mercury Grand Marquis have the most acceleration problems?
The Mercury Grand Marquis model years with the most acceleration complaints are 2005 (39 complaints), 2006 (37 complaints) and 1994 (33 complaints).
Other 2005 Mercury Grand Marquis problems
Lights 293Electrical 75Airbags 67Seat belts 36Steering 20Brakes 18Engine 14Body 11Visibility 11Tires 8Transmission 5Driver assistance 4Fuel system 2Seats 2Suspension 2Locks 1Wheels 1
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