really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
2 / 0
Average Mileage:
76,050 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.

2004 Mercury Grand Marquis lights problems

lights problem

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2004 Mercury Grand Marquis Owner Comments (Page 7 of 8)

« Read the previous 20 complaints

problem #32

Nov 292010

Grand Marquis

  • 100,838 miles


All headlights quit without notice of any sort. After replacing bulbs and switches, I went directly to Ford. They charged almost $700 to replace the "processor lighting control", which the service clerk explained was likely the problem. Since Ford knew this was a problem, why did they not recall the vehicles having this problem. We could have had a very serious accident.

- Addison, ME, USA

problem #31

Jun 112011

Grand Marquis

  • 89,567 miles
Head lights on my 2004 Mercury Grand Marquis will not come on. Parking lights work and hi beams. Got pulled over by columbus oh police department because I was driving with hi beams on. This is the second time that this has happened.

- Columbus, OH, USA

problem #30

Jun 082011

Grand Marquis

  • 40,000 miles
2004 Mercury Grand Marquis headlight will not come on. Must hold high beam lever to use headlights and drive with one hand. I replaced the light assembly didn't help.

- Baltimore, MD, USA

problem #29

May 052011

Grand Marquis 8-cyl

  • 92,350 miles


When driving at night the low beam headlights go out while vehicle is in motion. This failure is unpredictable and leaves the driver literally "in the dark" with the vehicle moving at whatever speed and direction it is going at. This is definitely a serious safety issue as my research has found that this is a common failure of the vehicle's "light control module" (lcm). Further research reveals that the Ford / Mercury automotive dealerships maintain a ready stock of this part for replacement at the hefty average price of $ $700. Given the severity of this safety issue it is difficult to understand why there has been no apparent action by NHTSA to require a recall by the manufacturer. This failure recurs frequently and unpredictably.

- West Cape May, NJ, USA

problem #28

Jun 202009

Grand Marquis

  • 50,000 miles
Vehicle has defective lighting control module (lcm). Headlights would not turn on until lcm was kicked. (lcm is mounted directly above gas pedal) now headlights are turning off while driving. (but come back on if the lcm is kicked. ) looking at ebay there are many companies that offer a total upgrade of your existing lcm. They install heavier duty relays. The part # on my lcm is 4W7T-13C788-aa. So it is evident that there is a problem with many lcm's in and around that model year.

- Dover, PA, USA

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problem #27

Apr 272011

Grand Marquis

  • miles
The nighttime head lights failed on the Mercury marquis. 2004 model; we brought the car into the dealership to have the module replaced which is expensive.

- Mandeville, LA, USA

problem #26

Apr 142011

Grand Marquis 8-cyl

  • 86,000 miles


My 2004 Mercury Grand Marquis headlights keep turning off without warning at night. I almost killed a pedestrian as the lights went out at night and I couldn't see before stopping the car. I did however strike the empty babystroller they were pushing which contained groceries. I'm told by the dealer that it is a module. Costing $500. Plus $99 an hour to diagnose ( which will of course be a min of two hours ) ad then the labor for total of about $1,000. This seems to happen more often the not. I've looked online and found lots of people with the same problem. Fortunately there have been no injuries or deaths yet as a result that I'm aware of. So when there is a death because of this, whose is going to tell the family that this was aproblem that could have been avoided or fixed. We should have to wait for injury or death for action to be taken. The dealer ( Lincoln Mercury) says its a defective part ( module). This is a safety issue since you can't legally drive a car @ night without lights. Please look into this and make something happen, please !

- North Haven , CT, USA

problem #25

Mar 022011

Grand Marquis 8-cyl

  • 72,000 miles
2004 Mercury Grand Marquis outside lights goes off and on intermittently. I have 72,000 miles on my car. It suddenly happen one day while I was driving at night from my second job on the highway. It scared me nearly to death and is very dangerous.

- Euclid, OH, USA

problem #24

Mar 212011

Grand Marquis 8-cyl

  • 112,800 miles
Headlights go out while driving. They will stay off for a 2 or 3 min. And will come back on for a while, then go off again. I have had the light go off in a 5 mile drive 4 times. This is very dangerous. I have not had a crash, but was pulled over by the police. I have replaced one part, the multi-purpose switch and it had no effect on the lights. After several days of research I believe the cause is the light control module, this part runs from 400 to over 700 dollars. I am on a fixed income and do not have the money to fix this problem. Ford should be the one to replace the part. The headlight switch has nothing to do with the lights going out. Since the purchase date the switch was on auto, after changing the M-P switch I put the headlights on manual on/off. This problem has being going on for over 2 months. The problem has not been fixed. No funds.

- Bentonville, AR, USA

problem #23

Mar 082011

Grand Marquis 8-cyl

  • 88,670 miles
Loss of headlights while night driving. This happened on two different occasions. Correction required was the replacement of the lighting control module (lcm) on a 2004 Mercury Grand Marquis gs ($512,00). We understand this problem entails 2000 to 2007 Ford Crown Victoria and Mercury marquis models only, and Ford Motor Co, has received numerous complaints about this happening but refuses to issue a recall notice.

- Spofford, NH, USA

problem #22

Jan 262011

Grand Marquis

  • miles


I was driving my vehicle and the headlights just turned off. I could not see the road. It lasted for about a minute where I have to stop on the side of the road and wait. After that they turned on. Then a few days later they did the same thing. This has happened about 10 times

- Patchogue, NY, USA

problem #21

Feb 122011

Grand Marquis 8-cyl

  • 78,000 miles
Headlights on my 2004 Mercury Grand Marquis stopped working while driving. All of the fuses are ok so problem is somewhere else. Parking lights and blinkers still work. Can hold the high beam lever towards the driver seat and lights will come on but I must hold the lever in while driving with one hand.

- Houma, LA, USA

problem #20

Jan 102010

Grand Marquis 8-cyl

  • 85,000 miles
The headlights do not stay on. The lights may or may not go on initially but can go out at any time making driving hazardous. The only way to make them light is to hold the handle in the "bright light" position." I have contacted Ford with the problem and several dealers to no avail. This has been happening for approximately a year. A related problem seems to be that the air conditioner blower stopped working and the brake light stays on all the time. Judging from the complaints I have read on the internet, many people have all three problems at once.

- Mesquite, NV, USA

problem #19

Oct 092006

Grand Marquis 8-cyl

  • Automatic transmission
  • 70,000 miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that since 2008, the headlights would turn off intermittently. The lights would turn on once the doors were opened but when the vehicle was started, they would turn off. The dealer inspected the vehicle and stated that the failure was caused by the computer which was replaced. However, the failure occurred again. The failure mileage was approximately 70,000 and the current mileage was approximately 110,000. Updated 02/23/11 the consumer stated the inside lights went out as well. Updated 05/09/11

- Neosho, MO, USA

problem #18

Sep 252010

Grand Marquis 8-cyl

  • 119,235 miles
Driving at 75 miles per hour at night on interstate 40, the headlights and dashlights went out on the 2004 Mercury Grand Marquis.

- Flora Vista, NM, USA

problem #17

Oct 092010

Grand Marquis

  • 83,000 miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that the headlights failed; they turned on and off intermittently. A mechanic inspected the vehicle and stated that the headlight control module was the cause of failure. The contact called the manufacturer who took a complaint but offered no further assistance. The vehicle had not been repaired. The failure mileage was approximately 83,000 and the current mileage was approximately 84,000.

- Pooler , GA, USA

problem #16

Oct 012010

Grand Marquis 8-cyl

  • 91,000 miles
Headlights randomly turn off. Doesn't seem to matter if I'm driving or not.

- Crainville, IL, USA

problem #15

Oct 202010

Grand Marquis

  • 110,000 miles
Driving home at night in my 2004 Mercury Grand Marquis all of a sudden my headlights went out. The only way to have headlights was to manually hold back the high beam mechanism on the steering column. Eventually they will come back on for a while but cut off again. Through research I found out it is a lcm module and can be fixed for approximately $700. I think Mercury should bear some or all of the responsibility for this as it will eventually cause a very severe accident.

- Belville, NC, USA

problem #14

Aug 292010

Grand Marquis

  • 49,500 miles
Headlights went out while driving the vehicle. This was on a dark, dark, 2 lane country road with little or no shoulder. Using the high beam "hold" function light would come on high beam. Working switches would not bring lights back on. Checking lights later, found lights would go out within 5 mins - stay out for less than 5 mins and then repeat. Repair was the lcm module which dealer charged aprox. $700 to fix. Very dangerous and scary! tail lights did stay on.

- New Boston, MI, USA

problem #13

Aug 092010

Grand Marquis

  • 149,000 miles
The contact owns a 2004 Mercury Grand Marquis. While driving at a very low speed, the headlights failed. The vehicle was taken to an independent repair shop where he was informed that the lighting control module would need to be replaced. The vehicle was not repaired. The VIN was not available. The failure and current mileages were 149,000. Updated 11/16/10 the consumer stated the vehicle was repaired at a cost of $511. Updated 12/01/10

- Marlborough, MA, USA

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