Problems · by component
2005 Mercury Grand Marquis vehicle speed control problems
39 owner complaints to NHTSA about the 2005 Mercury Grand Marquis cite vehicle speed control, 8% of all 488 complaints for this model year.
Complaints
39
8% of all complaints
Crashes
13
Reported by owners
Fires
3
Reported by owners
Injuries
12
Reported by owners
What owners say about the vehicle speed control
Verbatim from NHTSA complaints, newest first
“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 NHTSA 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.”
“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”
“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 *TR”
“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.”
Showing 6 of 39 reports. Read every report on NHTSA.gov.
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 9, 2026NHTSA vehicle page
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.