Mercury Grand Marquis Headlight Problems

Headlight complaints by model year

Which parts fail

• Headlights
  131
• Headlights › Switch
  9
• Headlights › High/low beam dimmer switch
  6
• Headlights › Concealment devices
  6
• Turn signal › Switch
  5
• Turn signal
  4
• Brake lights
  3
• Brake lights › Switch
  2

Components named in complaints (headlights, tail lights, turn signals, interior lights).

Mileage when the problem started

• Under 25k
  244%
• 25k–50k
  6910%
• 50k–75k
  14522%
• 75k–100k
  17827%
• 100k–150k
  17026%
• 150k+
  7712%

What owners report

The contact owns a 2008 Mercury Grand Marquis. The contact stated that the wiring harness for the brake pedal sensor was faulty, causing the exterior brake lights to fail to illuminate. The failure almost caused a collision. The dealer was made aware of the failure and informed the contact to bring the vehicle in to be diagnosed. The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 80,000.

First tried the hazard warning lights while parked on the side of a highway and they did not work. When I drove off I put the headlights on and turned on the windshield wipers. When I got home I turned off the wipers and the headlights but the headlights stayed on. I disconnected the battery cable and 2 days later I drove to the Ford dealership. While driving I noticed that my turn signals were not working. When I got to the dealership I pointed out these problems to the service manager. I left the car and they diagnosed a bad light control module. My car is 2008 Mercury Grand Marquis ls with 57,628 miles. They charged me $740 to replace the module. I researched recalls and I saw a recall 15s39 with # 15V861000 for this exact problem but it only applied to these same cars thru cy 2005. My car is a 2008. …

Tl* the contact owns a 2007 Mercury Grand Marquis. While driving approximately 50 MPH at night, the headlights turned off without warning. The contact utilized the high beam headlights. The contact took the vehicle to moffitt's Ford Lincoln [phone], located at 1819 se marshall st, boone, ia 50036) where it was diagnosed that the lighting system needed to be replaced. The part was ordered. The manufacturer was made aware of the failure and referred the contact to NHTSA. The vehicle was not repaired. The failure mileage was approximately 116,699.

Tl* the contact owns a 2007 Mercury Grand Marquis. While operating the vehicle, the headlights suddenly shut off. The vehicle was taken to an independent mechanic who diagnosed that the headlight module was faulty and needed to be replaced. The vehicle was not repaired. An unknown dealer and the manufacturer were notified of the failure, but no assistance was offered. The contact indicated that the vehicle was previously repaired for the same failure, but the failure recurred. The VIN was not available. The failure mileage was 230,000.

Tl* the contact owns a 2006 Mercury Grand Marquis. While driving approximately 65 MPH, both headlights stopped working. The contact had to maneuver to the side of the road. The contact mentioned that the high beam bar had to be held backwards in order for the head lights to work. The vehicle was not taken to a dealer or independent mechanic. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 89,200.

Tl* the contact owns a 2006 Mercury Grand Marquis. While driving at 10 MPH, the brake light switch failed to operate. The contact stated that when the brake pedal was depressed, the brake lamp failed to illuminate. The vehicle was not taken to be diagnosed. The contact stated that the brake light switch was replaced twice; however, the failure recurred. The manufacturer was notified of the failure. The approximate failure mileage was 47,000.

The contact owns a 2005 Mercury Grand Marquis. The contact stated that several years ago while driving at night at an undisclosed speed, the headlights became inoperable. The contact was able to restart the vehicle and the headlights resumed normal operation. The contact took the vehicle to a dealer and had the headlights serviced under a Customer Satisfaction Program. Recently, the contact stated while driving 55 MPH, the headlights became inoperable without warning. The contact was forced to use the hazard lights after multiple attempts to restart the headlights had failed. The contact coasted the vehicle to the nearest gas station and upon arrival the headlights began to operate. The vehicle was taken back to the dealer where he was given an estimate for the repair. The manufacturer was also notified of the failure but offered no assistance. The vehicle had yet to be repaired. …

The contact owns a 2005 Mercury Grand Marquis. The contact stated that while driving at approximately 40 MPH at night, there was a flash, and the headlights became inoperable. There were no warning lights illuminated. The contact's brother informed him to use the high beam headlights. The vehicle was taken to an independent mechanic, who stated that the failure was due to the lighting control module. The contact called the local dealer, who stated that the vehicle was not covered under a recall. The manufacturer was contacted, who informed him that the vehicle was not covered under a recall. The contact stated that the failure was related to NHTSA Campaign Number: 15V861000 (Exterior Lighting). The failure mileage was approximately 35,000.

Related recalls (1)

NHTSA investigations