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really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
2 / 0
Average Mileage:
76,965 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 5 of 8)

« Read the previous 20 complaints

problem #64

Jul 012013

Grand Marquis

  • 167,000 miles


Headlights do not turn on, internet reports light control unit fails this is a major safety issue.

- Whitinsville, MA, USA

problem #63

May 132013

Grand Marquis

  • 92,000 miles
The contact owns a 2004 Mercury gran marquis. The contact stated that while driving 50 mph, the headlights failed. The vehicle was taken to the dealer for inspection, who stated the headlight control module would require replacing. The headlight control module was replaced. The failure was reported to the manufacturer. The failure mileage was 92,000. The current mileage was 92,100.

- Mt Prospect , IL, USA

problem #62

May 302013

Grand Marquis 8-cyl

  • 81,000 miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that the headlights failed. The headlights stayed on if the high beams were activated. The contact changed the fuses and the light bulbs but the failure continued. The vehicle had not been to the dealer. The failure and current mileages were 81,000.

- Aurora, CO, USA

problem #61

Mar 152013

Grand Marquis 8-cyl

  • 26,000 miles


While driving home approx 10:30 pm my headlamps flicked on & of then went out totally and will not come back on, obviously a serious safety issue !

- Winter Springs, FL, USA

problem #60

Nov 092012

Grand Marquis 8-cyl

  • 100,000 miles
Driving home in the evening on a rural 2 lane highway in Ms. And my headlights goes off. No warning just went out. Tried to manually turn them on, but nothing happened. This incident could have turned out very different, if I wasn't familiar with the area...this problem seems to be bigger than just me...there was an investigation by your Agency NHTSA action #: PE08066, 11/26/08 to 3/24/09. This investigation was closed with basically no action taken at all. Just because nobody has died, or been reported injured, doesn't mean this issue is not a safety issue.

- Flora, MS, USA

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problem #59

Dec 312012

Grand Marquis 8-cyl

  • 80,000 miles
The contact owns a 2004 Mercury Grand Marquis. While driving approximately 50 mph, the headlights suddenly failed. The headlights became operable within ten minutes. The malfunction occurred four times. The vehicle was taken to an authorized dealer twice for the same failure. The second time a diagnostic test was performed, the technician stated the computer chip needed to be replaced. The vehicle was repaired. The manufacturer was notified of the defect. The approximate failure mileage was 80,000..... updated 03-28-13 the consumer stated at no time when the lights went off did an indicator on the dash board come on. The dealer advised the lighting control module needed to be replaced. Updated 04/09/2013

- Springfield, VA, USA

problem #58

Jan 162013

Grand Marquis

  • 76,000 miles


Headlights go off unexpectedly while driving at night. Experimenting found that high beam (unsafe when driving on 2 way road) may be kept on by holding the turn signal lever in the up position (thus occupying the left hand while driving) internet search indicates that this is a fairly common problem with this make and model, and that replacement of the light control module is expensive ($700 - $900) and not always a long term fix. Should be a Ford recall item.

- Springfield, MO, USA

problem #57

Sep 102012

Grand Marquis

  • miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that the high and low beam headlights became overheated and failed. The vehicle was not taken to a mechanic and was not repaired. The failure mileage was unknown and the current mileage was 125,000.

- Summertown, TN, USA

problem #56

Nov 142012

Grand Marquis

  • 62,000 miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that while driving approximately 60 mph with the headlights activated, there was a sudden failure in the headlight illumination. The contact continued to drive and within several minutes, the headlights operated normally. An authorized dealer was notified of the failure and informed the contact that the headlight control module would need to be replaced. The manufacturer was also notified of the malfunction. The vehicle had not been repaired. The approximate failure mileage was 62,000.

- Lehnorh, TX, USA

problem #55

Jun 042012

Grand Marquis

  • 101,000 miles
The headlights go and intermittently. They come on initially but only say on, on average, for about 5-10 minutes and will stay off for about 3-4 minutes. The headlight switch has been replaced but the problem is still occurring. No other mechanical work has been done since replacing the switch.

- Waco, TX, USA

problem #54

Sep 142012

Grand Marquis

  • 75,000 miles


The contact owns a 2004 Mercury Grand Marquis. The contact stated that the head lights failed. The contact attempted to turn them back on but to no avail. The contact allowed the vehicle to sit inoperable for several hours, in which the headlights then became operable. The vehicle was taken not taken to a dealer or a mechanic for inspection. The vehicle was not repaired. The manufacturer was not notified. The failure mileage was 75,000.

- Antario, CA, USA

problem #53

Jul 282012

Grand Marquis

  • 103,000 miles
My mother-in-law has a 2004 Grand Marquis & last night when she started the car to go home after visiting us, the headlights would not come on at all....additionally, the interior lights have come on all by themselves intermittently, and consequently, the battery is drained each time it happens. The interior problem may or may not fix itself by starting/shutting off/opening/closing door. All I did was type "2004 Mercury Grand Marquis" in yahoo search & a multitude of similar problems came up in the results: All stating a defective light control module (lcm). I am going to take the one out of her car today & take it apart & inspect it for cracked ("cold solder") solder joints as almost anything with a pc board ( (made in the last 25 years especially) tends to develop cracked solder because they are made cheaply by using as little solder possible to hold the joint together (when new, anyways). Yet another cheap, modern junk electronic item pumped out in bulk by the thousands that the manufacturer will not support, unless it fails within the warranty period! I cannot believe Ford Motor Company won't issue a recall for this problem as it is not an isolated problem, according to my research! maybe once someone dies in a car wreck from the lights going out while they're going down a freeway @ 70mph, someone will get a good lawyer and sue the pants off of Ford Motor Company!! class action lawsuit, anybody?

- Elizabethton, TN, USA

problem #52

Jul 112012

Grand Marquis

  • 86,500 miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that illuminated sporadically without warning. The vehicle was taken to a local repair shop, who diagnosed that the lighting control module was defective and needed to be replaced. The manufacturer was made aware of the failure and did not offer any assistance. The vehicle was not repaired. The failure mileage was 86,500 and the current mileage was 87,000.

- Paw Paw , MI, USA

problem #51

Dec 092011

Grand Marquis 8-cyl

  • 65,800 miles
On three or four occasions over a month or so, my headlights, which I turned on manually, went out while I was driving. The last time it occurred, I was on a dark, unlit, two-lane road and thought I would not get home alive. I pulled over, turned off the engine, turned on my emergency flashers and interior lights so that other vehicles would see me. When the road was clear, I started the car again, turned on the headlamps and proceeded to continue my ride home. The lights again went out and I repeated the process until I was home safely. After that, I drove only during daylight. I went to a spartan auto care center and after a diagnostic scan, was told that I needed to replace the head light control module. I was told that this was a common problem with the Grand Marquis. I elected to take it to a Ford dealer when I finally could afford to repair it. The dealer replaced the head light control module on March 30, 2012 at a cost of $760.43. I have seen a litany of complaints from other owners, so this is not an isolated problem. I think this is a dangerous defect and we should be reimbursed for the expense involved.

- East Longmeadow, MA, USA

problem #50

Apr 162012

Grand Marquis

  • miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that the headlight could not be turned off and sporadically, the headlight would not illuminate. The battery had to be disconnected in order to turn the headlights off. The vehicle was not taken to the dealer nor repaired. The failure mileage was not available and the current mileage was 54.095.

- Foley , AL, USA

problem #49

Apr 062012

Grand Marquis

  • miles
The headlights turned off, while driving 20 mph, and would not come back on..I have noticed on the internet that there are alot of complaints about this same problem, why no recall, what if I was driving 55 mph, things could have turned out very car will sit in front of my house until a cure is found..thank you

- Cascade Locks, OR, USA

problem #48

Sep 052011

Grand Marquis

  • 61,000 miles
Lights went out while driving down a major highway, only brights would work, then they went off. After clicking them off and on they came back on for a while, then off again. What a dangerous situation this is!! please do a recall on this as I have seen numerous complaints about this happening to people. I can not go anywhere at night in my car, only trust daytime driving now!

- Jennings, LA, USA

problem #47

Feb 162012

Grand Marquis

  • 60,002 miles
2004 Grand Marquis, original owner, 60002 miles. Low beam headlights ( in rain ) just turned off by themselves. High beam was okay. Cars approaching from opposite direction continued to blink their lights at us - telling us our lights were not on ( state of Florida requires headlights to be on during rain storm ). called dealer upon reaching home - he did not seem surprised. Said bring it in and we will replace the " lighting control module ". after several minutes on the phone was informed that the cost would be approx. $700. And that type repair is common on the Ford and Mercury automobiles. Lights just going off - rain, fog or night driving is unsafe. This problem is a traffic problem for the driver as well as fellow drivers sharing the road.

- Tallahassee, FL, USA

problem #46

Jan 202012

Grand Marquis 8-cyl

  • 42,500 miles
Both headlights went out at night without warning, dangerous condition. The dealer replaced the lighting control module which had failed #4W7Z13C788.

- Allentown, PA, USA

problem #45

Dec 122011

Grand Marquis

  • miles
The contact owns a 2004 Mercury Grand Marquis. The contact stated that the headlights would fail sporadically and without warning. The vehicle was not inspected for the failure. The contact stated that he believed that the failure was caused by the sensors. The vehicle was not repaired. The VIN was not available. The current mileage was 57,000 and the failure mileage was unknown.

- North Handover, MA, USA

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