really awful
Crashes / Fires:
0 / 1
Injuries / Deaths:
1 / 0
Average Mileage:
75,968 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 electrical problems

electrical problem

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2004 Mercury Grand Marquis Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #9

Oct 062011

Grand Marquis 8-cyl

  • 34,234 miles


My Mercury marquis is unsafe! both of my night-time headlights went out at the same time. All other lights work fine inside and out. The head-lights now only work if I hold the high-beam bar, however, they do not work if I let go of the control bar. I drive my vehicle very little, and mostly during the day; however, I do take 70 mph interstate highway trips returning at night. There is no fuse for the head lights or the light control module in either the fuse box above the brake pedal, or under the hood. Further investigation reveals that the head light fuse is inside the light control module which is located under the dash above the gas-pedal. Also, I've learned that even when this lcm unit is replace, that a new lcm unit can be defective also. Common sense dictates that something electrical is causing the fuse to blow in the unit. I believe this indicates a looming fire hazard about to happen. Overheating the electrical system from where" if I would elect to have the lcm unit modified with a larger interior fuse, I fear this is not a solution either. Ford needs to find the source of the problem that is blowing this fuse even in the new units. The installation at the dealership is $700 or above. The market price of the lcm unit is $90. Fords needs to recall and replace this lcm unit for an indefinite period; however, since they are making a bunch of money replacing them, and no one has gotten killed yet, will they" I fear replacing the unit this week, an the new one failing and me, suddenly with no headlights possibly running over a pedestrian, or crashing on the interstate and me or someone dying. This problem makes my Mercury absolutely unsafe !!! I want an indefinite recall of this unit, and for Ford to find and repair the cause of the unit failing.

- Destin, FL, USA

problem #8

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 #7

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 #6

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 #5

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 #4

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 #3

Jul 052009

Grand Marquis

  • 100,600 miles


Light controler shuts lights off at night while driving. The only way to get lights to drive with is to hold dircetional signial handel up with one hand and drive with the other.

- Middletown, DE, USA

problem #2

Jun 062009

Grand Marquis

  • 96,500 miles
While driving at night with the headlight switch in the automatic selection the headlights went out. This was on June 6, 2009, at 11:00 P. M. then on June 27, 2009, at 9:10 P. M. while turning onto an interstate highway the headlights went out again. This time the headlight selection switch was in the manual mode. Both time the highbeam selection switch was pulled and after a 15 to 20 minute period the headlights came back on.

- South Windsor, CT, USA

problem #1

Mar 212009

Grand Marquis

  • 79,000 miles
The contact owns a 2004 Mercury Grand Marquis. While driving 50 mph, the contact smelled a burning odor and noticed smoke coming from the lighting control module. He pulled the vehicle over and opened the hood. The horn began to sound, so he disconnected the battery. The fire department arrived and a report was filed. The contact was informed that the failure was due to an electrical issue. The vehicle was towed to a repair shop and the lighting control module box was repaired. The dealer stated that they were unaware of the failure. The failure and current mileages were 79,000.

- Denim Springs, LA, USA

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