2008 Mercury Grand Marquis engine NHTSA complaints: Vehicle Speed Control

NHTSA — Vehicle Speed Control Problems


really awful
Crashes / Fires:
4 / 1
Injuries / Deaths:
4 / 0
Average Mileage:
32,793 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.

2008 Mercury Grand Marquis engine problems

engine problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2008 Mercury Grand Marquis:

Unsubscribe any time. We don't sell/share your email.

2008 Mercury Grand Marquis Owner Comments

problem #11

Jun 132012

Grand Marquis 8-cyl

  • 39,000 miles


Car speeding up while braking.

- Mount Ida, AR, USA

problem #10

Aug 252013

Grand Marquis 8-cyl

  • 87,500 miles
When reversing out of driveway car accelerated on its own. Pressed brakes but car still moved backwards. Have skid marks in driveway to show for it. Threw car into neutral and turned off engine. Restarted and everything seemed normal. Drove car on trip and when reducing speed to slow down by pushing on brake car again accelerated and nearly hit another car. Again threw car into neutral and turned off engine. And again when restarting car everything seemed normal again. Wife is extremely afraid of driving car. Took car to dealer where it was purchased and was told that it may have been that I pushed the brake and gas pedal at the same time, this however, I believe is not the case. Dealership however kept the car for further investigation as to what the problem may be. Will hear in a day or two.

- Stow, MA, USA

problem #9

Aug 142013

Grand Marquis 8-cyl

  • 56,150 miles
Vehicle was purchased used in June, 2011. While braking for a stop light, vehicle suddenly accelerated. Had to forcefully pump brakes to stop vehicle from hitting vehicle in front. Car returned to normal operation as soon as I got it stopped. Have had similar incidents a couple of times before, although not as bad as this one, however, at that time I thought maybe I had accidentally pressed the accelerator while braking. I know that was not the case this time.

- Jesup, GA, USA

problem #8

Feb 262009

Grand Marquis 8-cyl

  • 17,869 miles


The contact owns a 2008 Mercury Grand Marquis. The contact stated that while depressing the brake pedal and driving approximately 5 mph, the RPM reading increased as the vehicle jerked forward. The contact stated all the warning lights on the instrument panel illuminated. The failure recurred various times causing a crash. The contact was driving approximately 60 mph when the vehicle accelerated, causing the contact to crash into a guard rail and a concrete wall. The police reported to the scene and a report was filed. The vehicle was towed to the dealer for diagnosis where the technician was unable to diagnose the failure. The manufacturer was made aware of the failure. The vehicle was not repaired. The approximate failure mileage was 17,869.

- Jeffersontown, KY, USA

problem #7

May 222013

Grand Marquis 8-cyl

  • 86,000 miles
I was driving on the interstate going about 65 mph. I accelerated rapidly to pass a semi when I was getting close to my exit. After passing the semi I let my foot off of the accelerator but the vehicle did not slow down. I applied the brake pedal but the vehicle kept accelerating for about 5 seconds. After that I heard an audible "clunk" come from the engine compartment and the vehicle returned to normal operation. This is the second time this has happened the first was a month ago accelerating rapidly from a stand still position. In neither case did I wreck or get a speeding ticket.

- Lebanon, IN, USA

problem #6

Sep 282007

Grand Marquis

  • 4,500 miles
The contact owns a 2008 Mercury Grand Marquis. The contact stated that while using the cruise control, applying the brakes and resuming to normal the vehicle suddenly accelerated to higher speeds. The vehicle stopped after the brake pedal was applied. The vehicle was inspected by a dealer who was unable to diagnose the failure since they were unable to duplicate it. The vehicle was not repaired. The failure mileage was approximately 4,500.

- Lake Villa, IL, USA

problem #5

Oct 102008

Grand Marquis

  • Automatic transmission
  • 500 miles


The contact owns a 2008 Mercury Grand Marquis. The contact stated he started the vehicle and when depressing the brakes, the vehicle abnormally accelerated. The contact was unable to stop the unintended acceleration and the vehicle drove over a curb and crashed into a sign. The contact and passenger both sustained minor injuries to their necks from the seat belt. The vehicle sustained substantial front end damages. The vehicle was towed to the dealer and inspected but the cause of the unintended acceleration failure was not disclosed to the contact. The body damage was repaired and the contact traded the vehicle fro another. The failure and current mileages were 500. Updated 10/01/2010. Updated 10/04/10

- St.Louis , MO, USA

problem #4

Jul 042010

Grand Marquis

  • 42,000 miles
The contact owns a 2008 Mercury Grand Marquis. After driving in reverse and shifting into drive from a stop light the vehicle surged forward and crashed into another vehicle. A police report was not filed. One person was reported injured. Smoke was seen coming from under the hood of the vehicle. The vehicle was towed to the contacts residence. The failure had not been diagnosed by the dealer. The failure and current mileages were 42,000.

- Waynesboro, VA, USA

problem #3

Jan 062010

Grand Marquis

  • 27,000 miles
Cruise control, sudden acceleration. Car went to 80 before I could stop it vehicle is a 2008 Mercury Grand Marquis ls with 27,500 miles on it. The dealer replaced the ECM. This happened to my wife also at 35 mph went to 65 before she stopped it.

- Jackson, NJ, USA

problem #2

Mar 142009

Grand Marquis

  • 200 miles
I was preparing test drive 2008 Mercury marquis at honolulu Ford. I was stopped at the exit to houghtailing St when the engine accelerate. I looked down and my foot was not on the gas it was on the brake. The car started to move out into the street crossing the road hitting another vehicle and a light pole.

- Waianae, HI, USA

problem #1

Sep 122007

Grand Marquis 8-cyl

  • Automatic transmission
  • 4 miles
When stepping on brake, motor raced up to 5000 RPM. ( like cruise control was engaging. Had to go to neutral pump the accelerator to bring RPM down. In a parking lot with both feet on the brake it pushed me 5 feet before I could get it under control.

- Las Vegas, NV, USA

Not what you are looking for?