NHTSA — Vehicle Speed Control Problems


really awful
Crashes / Fires:
7 / 1
Injuries / Deaths:
5 / 0
Average Mileage:
37,569 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2006 Mercury Grand Marquis engine problems

engine problem

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2006 Mercury Grand Marquis Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #12

Mar 262010

Grand Marquis

  • 30,351 miles


The contact owns a 2006 Mercury Grand Marquis. While driving at approximately 30 mph, the vehicle suddenly accelerated up to 50 mph although the contact depressed the brake pedal. The vehicle would not slow down even after the contact turned off the ignition and continued to coast up the hill until it crashed into a curb. There were no injuries but a police report was taken. The vehicle was towed to a local repair shop where it was repaired. After the repair, the dealer performed a diagnostic test on the vehicle but no failure was found. The contact called the manufacturer and was told that they would get back with him for an investigation. The current and failure mileages were 30,351.

- Jefferson City, MO, USA

problem #11

Aug 112008

Grand Marquis 8-cyl

  • Automatic transmission
  • 26,000 miles
The contact owns a 2006 Mercury Grand Marquis. The contact stated that when utilizing the cruise control at 60 mph and higher, the vehicle would abnormally accelerate without warrant. He was able to deactivate the cruise control by depressing the brake pedal but the engine continued to idle violently and the vehicle continued to accelerate. The contact was unable to deactivate the cruise control using the deactivation switch on the steering wheel. The dealer could not duplicate the failure. He stated that the vehicle was safe to drive and the failure was contributed to either the floor mats or driver error where the contact was mistakenly hitting the cruise control resume button. There were no repairs made to the vehicle. The failure mileage was 26,000 and the current mileage was 33,000. Updated 6/3/10 the consumer stated tapping the brake didn't always release the cruise control. Updated 06/17/10

- Trenton, FL, USA

problem #10

Dec 212009

Grand Marquis

  • 40,000 miles
Sporadically and without warning, my cruise control will activate causing the vehicle to immediately accelerate. I had been using the control but had de-activated it but depressing the brake which leaves the unit "on" but not activated.

- Holland, MI, USA

problem #9

Oct 142008

Grand Marquis 8-cyl

  • Automatic transmission
  • 27,000 miles


The contact owns a 2006 Mercury Grand Marquis. When applying pressure to the brake pedal and placing the vehicle into reverse, the gear lurches forward unexpectedly. The contact has to switch the vehicle into neutral to stop the unintended acceleration. He took the vehicle to the dealer, but they could not identify the cause of the failure. The failure mileage was 27,000 and current mileage was 29,000. Updated 07/17/09 the consumer stated on 2 occasions, he started the vehicle; put it in drive and the motor raced and the vehicle lurches forward. He had to put the vehicle into neutral and turn off the ignition to stop the vehicle. The dealer was unable to duplicate the consumers concern. Updated 07/17/09.

- Hanover Township, PA, USA

problem #8

May 152009

Grand Marquis

  • 47,393 miles
Was getting on highway, accelerated more than normal to pass a very slow vehicle entering highway from 5 mph on highway (estimate 80 to 90% of full throttle), when I was safe of slow vehicle and let off the pedal, vehicle continued to accelerate to about 83 mph as I recall, I continued to press brake, still accelerating, pressed steering control buttons to make sure cruise control was off (did not have it on previous to this), pressed brakes again and again, finally vehicle slowed down just before I was going to turn of the ignition. Did not have the car checked out, did not smell or see anything irregular, vehicle increase in the continued speed was felt with some G-force before it went back to normal operation. Appears that it just went full throttle on its own I could feel it really moving. Has only occurred once, I also emailed Ford regarding this issue. Luckily it was 5 a.M. in the morning no harm done, just frightened. Bought car used @ 45 K incident occurred around 47,393 miles.

- San Antonio, TX, USA

problem #7

Mar 012006

Grand Marquis

  • miles
2006 Mercury Grand Marquis sedan that surge forward while in gear* the consumer stated immediately upon taking delivery of the car the vehicle would occasionally lunge forward. The consumer stated notified the dealer of this defect and the dealer stated that there was no problem with the vehicle. The consumer stated one incident is when a pedestrian was crossing the street in front of the car the consumer had to jam on the brakes to avoid hitting the pedestrian. The consumer stated they feel this is a big safety hazard and would like the problem assessed.

- Naples, FL, USA

problem #6

Jul 042007

Grand Marquis 8-cyl

  • Automatic transmission
  • 9,000 miles


The contact owns a 2006 Mercury Grand Marquis. The contact stated that the vehicle accelerates intermittently. When switching gears from reverse to drive, the vehicle jolts. While at a stop light, the contact had to use maximum pressure in order to apply the brakes. The engine tachometer indicated that the vehicle was at 2000 RPM. The contact stated that the tachometer is normally at 550 RPM. The current and failure mileages were 9,000.

- Brownsburg, IN, USA

problem #5

Feb 082006

Grand Marquis 8-cyl

  • Automatic transmission
  • miles
When I started the engine each morning on the 2006 Mercury Grand Marquis ls it revved to 2000 rpms for 5 or 6 seconds, then down to 1000 rpms for about 2 seconds, then down to normal. It seemed to me it was going to damage the engine revving so high when the engine was cold and very little oil in the upper portion. What could be done about lowering the starting to rev.

- Debary, FL, USA

problem #4

Aug 052006

Grand Marquis 8-cyl

  • Automatic transmission
  • 3,200 miles
: the contact stated when entering an off ramp at 30 mph and braking into the turn, the vehicle began to accelerate without warning. Extreme pressure to the brake pedal was applied to slow and finally stop the vehicle. A moment after stopping the vehicle, the engine slowed and began to operate normally. When taken to the service dealer, the problem could not be recreated or identified. The manufacturer was notified. Updated 11/30/2006 -

- Mansfield, OH, USA

problem #3

Sep 282006

Grand Marquis

  • Automatic transmission
  • 721 miles
: the contact stated while normally applying the brakes, the vehicle lurched forward suddenly, requiring extreme pressure on the brake pedal to stop the vehicle. It was taken to a service dealer, who was unable to determine the problem. Updated 10/18/2006 - prior to the above incident the vehicle lurched forward while approaching a stoplight. The more pressure the consumer applied to the brake pedal the more the engine raced. The vehicle continued to travel forward through the crosswalk and into the street. Luckily no one was in the crosswalk and no cars were coming through the intersection. The consumer has to turn the vehicle off to get it to stop.

- Silver Spring, MD, USA

problem #2

Apr 132006

Grand Marquis 8-cyl

  • Automatic transmission
  • 713 miles
: the contact stated there were three separate problems with the vehicle. The first problem occurred when the automatic pedal adjuster was being used the engine revved. The second occurred while driving, the accelerator pedal was difficult to depress, after several miles of driving in this condition, the contact pressed and released the pedal and it suddenly resumed normal operation. While in stop and go traffic driving at 20 mph the vehicle surged forward, while the brakes were applied and rear ended another vehicle. Seatbelts were in use; no injuries were sustained to the four occupants of the contacts vehicle, however the driver of the other vehicle sustained injuries. The police were on scene but no report was filed. The vehicle was returned to the rental Agency and another model was issued.

- West Wyoming, PA, USA

problem #1

Apr 102006

Grand Marquis 8-cyl

  • Automatic transmission
  • 440 miles
: the contact stated while attempting to apply brake pressure at low speeds the brakes failed, causing the vehicle to accelerate. The dealership was unable to duplicate the problem. Updated 05/30/06.

- Kettering, OH, USA

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