really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
23,750 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.

2009 Mercury Grand Marquis engine problems

engine problem

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2009 Mercury Grand Marquis Owner Comments

problem #4

Apr 182015

Grand Marquis

  • 37,000 miles


The contact owns a 2009 Mercury Grand Marquis. While driving 30 mph, the vehicle failed to respond when the brake pedal was depressed and the vehicle independently accelerated. The contact was able to stop the vehicle by switching to the park position. The vehicle was taken to a dealer where it was diagnosed, but the contact was unaware of the diagnosis. The vehicle was repaired, but the failure recurred. The manufacturer was notified of the failure. The failure mileage was 37,000.

- Framingham, MA, USA

problem #3

Aug 172012

Grand Marquis

  • 33,000 miles
The contact owns a 2009 Mercury Grand Marquis. The contact stated that while the brakes was engaged there was an sudden increase on engine rpms. The contact mentioned that the rear wheels started to spin and in order to stop it he had to shift into neutral. The vehicle was taken to the dealer who was unable to duplicate the failure. The failure mileage and current mileage was 33,000.

- Riverton, NJ, USA

problem #2

Jan 252012

Grand Marquis

  • 15,000 miles
I applied the brakes at around 20 miles per hour on January 25 and the motor accelerated for one or two seconds. I was able to stop the car by pressing the brakes much harder than normal. On January 26 I applied the brakes at around 60 miles per hour and the motor again accelerated for one or two seconds. I continued to press the brakes, the motor slowed down and the car eventually slowed. It sounded like pressing the accelerator down hard to pass another car on a two lane road.

- Ridgeland, MS, USA

problem #1

Oct 212009

Grand Marquis 8-cyl

  • Automatic transmission
  • 10,000 miles
The contact owns a 2009 Mercury Grand Marquis. He applied pressure to the brake pedal when attempting to park the vehicle, but it lurched forward. The vehicle crashed through the garage walls into the adjacent room. There was no personal injury. There were damages to the walls and furniture which occupied the adjacent room. The front end of the vehicle sustained moderate damages. The vehicle was towed to an authorized dealer for diagnostic testing. The vehicle was repaired for the body damages. The technician was unable to determine the cause of failure. The failure and current mileages were 10,000. Updated 11/23/09 updated 11/24/09

- Hickory Hills , IL, USA

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