2003 Mercury Grand Marquis acceleration problems

Filed Jan 20, 2023 · Acceleration, Electrical · CA · crash

I started Mercury with foot on break like normal. Shifted into reverse. Car accelerated backwards at full speed. Brakes did not stop car. Attempted to shift into neutral but went into drive instead. Car accelerated forward at full speed with my foot still on break. Car hit metal post and tree knocking them down and dragging the tree 50 to 60 feet before stopping with my foot still on the break. Car had stopped accelerating. I turned off the ignition. This unintended acceleration had happened before. Two different dealers attempted to fix the problem. Both of them thought they had been successful but it happened again. Previously, applying the brakes stopped the car, but not this time. Someone could have been injured severely or killed.

Filed Feb 4, 2016 · Acceleration · IL

Unexpected acceleration when car is stopped at a light, car lunges forward. On one occasion the car was burning rubber . Very dangerous and scary. Have to shut off ignition when this happens. Has occurred several times. My wife refuses to ride in the vehicle.

Filed Oct 10, 2014 · Acceleration, Brakes · 130,000 miles · NC

Tl* the contact owns a 2003 mercury grand marquis. The contact stated that while driving 20 MPH, the brake pedal was depressed and the engine rpms increased approximately to 4000. The contact stated excessive force was applied to the brake pedal and the vehicle jerked. The brake pedal was aggressively depressed until the brakes responded and the vehicle was able to come to a stop. The vehicle was taken to the dealer where the failure was unable to be diagnosed. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 130,000. The consumer stated when he applied the brakes, the vehicle slowed down. However, the engine speed increased to 4,000 RPM's/ with the brake fully depressed, the vehicle continued with a series of lunges at a high speed. Only by releasing the brake pedal and slamming on the brake, did the vehicle stop about three quarters across the intersection with the engine at a normal idle speed. No warning lights displayed on the dashboard. The vehicle had a history of almost stalling while coming to a stop. The dealer did not find any codes. Updated 12/04/14

Filed Oct 28, 2013 · Acceleration · 147,696 miles · DC · crash

Tl* the contact owns a 2003 mercury grand marquis. The contact stated that while stopped, the engine rpms increased excessively as the vehicle violently accelerated without warning. The contact crashed into another vehicle. There were no injuries and a police report was filed of the incident. The vehicle was taken to a dealer where the failure was unable to be duplicated or diagnosed. The manufacturer was notified of the failure. The vehicle was not repaired. The approximate failure and current mileage was 147,696.

Filed Oct 19, 2012 · Acceleration · 100,000 miles · NY · crash · 1 injury

Tl* the contact owns a 2003 mercury grand marquis. The contact started the ignition with the brake pedal depressed and suddenly the vehicle unintendedly accelerated when the gear lever was shifted into drive. The brake pedal was engaged numerous times and the vehicle failed to slow down and crashed into the nearby garage and also crashed into a parked vehicle. A police report was filed of the incident. The driver sustained injury to the left knee. The vehicle was completely destroyed and towed to an authorized dealer. The manufacturer was not notified of the unintended acceleration malfunction. The approximate failure mileage was 100,000. The VIN was unavailable.

Filed Jul 15, 2011 · Acceleration · 50,400 miles · TN · crash

Tl* the contact owns a 2003 mercury grand marquis. The contact stated was attempting to park the vehicle while driving 5 MPH in a residential driveway when the vehicle abnormally accelerated. The contact crashed into the garage of his home. The brakes were applied during the failure but did not respond. The contact was uninjured yet there was extensive damage to the vehicle. The vehicle had not yet been inspected or repaired. The manufacturer was not notified of the failure. The failure mileage was 50,400.

Filed Jul 12, 2011 · Acceleration · 162,000 miles · TX

Tl* the contact owns a 2003 mercury grand marquis. The contact stated that sudden acceleration was experienced in the vehicle. The vehicle began gradually lunging forward sporadically until it became harder for the contact to stop the vehicle when the failure occurred. The contact stated that once pressure was release from the accelerator pedal, the vehicle rapidly accelerated at full force. The vehicle was not inspected for the failure. The failure and current mileage was 162,000.

Filed Jul 27, 2010 · Acceleration · 50,000 miles · IL · crash

Tl* the contact owns a 2003 mercury grand marquis. While traveling at 4 MPH, the contact applied the brakes and the vehicle independently accelerated. The contact crashed into another vehicle as a result. There were no injuries. On a later date, while parking in a residential garage, the contact depressed the brakes and the vehicle abnormally accelerated. The vehicle crashed into the garage wall and through the master bathroom of the home. The contact sustained injuries to her pelvis from attempting to apply extreme force to the brake. A police report was available. The vehicle was not diagnosed for the unintended acceleration failure. The failure mileage was 50,000 and the current mileage was 90,000.

Filed Jan 29, 2010 · Acceleration · 20,000 miles · MS · crash

Sudden acceleration in a 2003 mercury grand marquis. This happened after putting the vehicle in drive, it took off at an excessive rate of speed crossed a street and jumped two curbs about 15 inches high within 5 or 6 seconds. My thoughts were "what is happening?" & "brake or you are going to die" thank god this vehicle drown in hurricane katrina. I called your ofc in 2004 after this happened and was sent a form to fill out and return to you which I never did. However, with the toyota recall it disturbs me that my ford did the same thing. An investigation needs to be made as to why these things are happening because in my case it was not a floor mat and neither was it driver's error. It is important to myself that this incident is reported and hopefully someone will take it serious and find out what the real problem is before more lives are lost. I consider myself very lucky that I was not injured and others were not injured. My vehicle sustained $5,000.00 worth of damage and at the time the incident was reported to the ford dealership. They supposedly checked the car but could find no reason for the sudden acceleration.

Filed Oct 20, 2009 · Acceleration · 25,000 miles · NJ

Tl* the contact owns a 2003 mercury grand marquis. While approaching a stop light the vehicle accelerated without intention through an intersection. After repeated brake application the vehicle would not stop. She was able to decelerate by driving onto the side of the road. She was in the process of towing the vehicle to the dealer. The failure mileage was 25,000.