really awful
Crashes / Fires:
4 / 2
Injuries / Deaths:
2 / 0
Average Mileage:
67,003 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.

2005 Mercury Grand Marquis electrical problems

electrical problem

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2005 Mercury Grand Marquis Owner Comments (Page 3 of 4)

« Read the previous 20 complaints

problem #21

Jan 292012

Grand Marquis 8-cyl

  • 83,005 miles


It was approx. 2:30am [night time] and I was driving on a rural state highway @ 65mph with the cruise control set. The headlights on my 2005 Mercury Grand Marquis suddely went out. The switch was set to automatic on / off. Visibility instantly became zero in the pitch black.. as I was 20 miles outside of town on a state highway in an unpopulated area with no lighting.. not even moon light. I slammed on my breaks running off the roadway into the drainage ditch.. taking over 100 feet to stop. After gaining my composure, I noticed that my dashlights were still working along with my yellow warning lights. I tried the headlights switch by changing it from off, to full on- to auto... with no success at first. But after 3-4 minutes the lights suddenly came back on and worked in both the auto & in the switched 'on' positions for 20-30 seconds and then shut off. So I knew the problem wasn't with a blown fuse. This continued to be the cycle.. the headlights would come on for 20-30 seconds and then shut off for several minutes before working again. By pulling the turn control / high beam lever toward me, I was able to get the passing light setting of my headlights to work and was able to drive back home... but this created a danger to vehicles I met.. as it blinded them. I couldn't turn off the bright passing beam without going dark on the roadway. Next morning I checked the internet about this problem and discovered that 1000's of other Mercury Grand Marquis owners have had this same problem.. that Mercury has known about this problem for years... with similar problems prior to 2005. Not only has Mercury knowingly endangered my and the other owners [and their faimlies] lives.. Mercury has created a very profitable income charging its customers close to $700 for a repair that they know is the result of a faulty factory installed headlight control module. This rates a recall!

- Altus, OK, USA

problem #20

Jan 092012

Grand Marquis 8-cyl

  • miles
Upon starting up 2005 Mercury marquis (~24000 miles) and placing car into drive, car accelerated at a high rate of speed and crashed into a gas station pump. The car accelerator malfunctioned and was in a "jammed state". the driver immediately put right foot then both feet on brake trying to get the vehicle to stop. The car would not slow much less stop. Driver suffered very serious eye injury and currently has no sight in injured left eye. There is the risk of losing left eye. Passenger suffered fractured sternum and other bruising. Both driver and passenger are traumatized from this car accelerator malfunction.

- Spring Lake, NJ, USA

problem #19

Dec 282011

Grand Marquis

  • miles
The lights went out while driving in the city at night. I pulled over and played with the light switch until they came back on. I had trouble with the lights several times, before I replaced the light switch on 01/04/12. On a trip to the store tonight, the lights went out again. After checking on the internet, it seems it must be the lcm module, at a cost of $700, to $900. Dollars. It seems this is a very dangerous problem with Ford Motor Co, vehicles.

- New Bern, NC, USA

problem #18

Jun 012010

Grand Marquis 8-cyl

  • 78,252 miles


Headlights go out or sometimes will not come on. Lighting control module relay intermitten. Lights go out with no warning while driving. High beams and cornering lights also inop when acting up.getting worse with time. This is a serious safty issue as it happens on freways, highways etc. We have to tap the lcm in order to get the lights back on but they go out again. This is a very expensive fix ($800) so I cant afford to have replaced. Please this should be a recall.

- Redford, MI, USA

problem #17

Jun 012011

Grand Marquis 8-cyl

  • 50,000 miles
Automatic controls for air conditioning/heat defective in many, many cars. Mercury Grand Marquis 2005. Serviceman tells us that there should be a recall for this item as this is a major issue nationwide!

- Cullman, AL, USA

problem #16

May 152011

Grand Marquis 8-cyl

  • 72,251 miles
My wife and I were pulling into a four lane highway at 9:30 pm in the evening, after finishing dinner. Once we had approached highway speed of about 45 to 50 mph, our front head lights went out. Immediately my wife pulled off the highway with our lights out, I got out of the auto to insure the lights had indeed gone out...yes, they were out black as midnight. I asked my wife to see if they would come back just for the heck of trying something. Yes the lights did come back on and remained on for the remainder of our 25 minute drive. As my wife and I were driving home, she indicated to me this was not the first time, only one of several times as she was driving, it might be in the rain day or night, she never knew when it would happen, however at this time, the lights seem to go out on a regular basic. I'm going to see if the dealer can repair, what I have been lead to believe is the lcm, and to expect a charge up to $800+, this is a horrible accident waiting to occur, and a expense that I think merc. Show absorb, with all of the problems with the same problem for several years now, I would hope a nation wide recall should take place, before the is loss of life. I thank you for your time, and I do appreciate any help you may be able to offer. Kind regards, owner of the above auto, 2005 merc. Grand marq. Light control module, problem.

- Westover, AL, USA

problem #15

Jun 022011

Grand Marquis

  • 44,300 miles


While driving the headlights went completely out. The high beams would only come on if you pulled the lever forward and this was only momentarily. Was not able to use the switch to turn them back on. Had to pull over in a parking lot because it was dark. After a few minutes the lights started to work again but soon failed again.

- Pearland, TX, USA

problem #14

Feb 102010

Grand Marquis

  • 60,000 miles
I have a 2005 Mercury Grand Marquis. I was driving and suddenly my headlights went out without warning. This is a very scaring situation at night. I have been looking online to see if there has been a recall, and also I took it to the Ford dealer where I purchased the vehicle and they told me it was a electrical module and the cost is enormous. I don't think that me the consumer should have to bear the cost of a defect that is such a safety hazard. Why haven't this matter been recalled? someone could lose their life, traveling down a dark two lane highway and suddenly you have no lights. This is very frightening. And what's more frightening is that nothing is being done about. But I will not stop until I see something done.[xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Cedar Hill, TX, USA

problem #13

Dec 302010

Grand Marquis

  • miles
2005 merc., head lights go off or don't come on for a mile or two. Switch on manual or auto. Dealer had car for two days, said all checked ok.

- Lake Kiowa, TX, USA

problem #12

Jan 062011

Grand Marquis

  • 74,000 miles
In the last two weeks when putting turn signal on the headlights go out.

- Randolph, MA, USA

problem #11

Dec 222010

Grand Marquis 8-cyl

  • Automatic transmission
  • 94,500 miles


I was driving on I-81 at night, I operated my left turn signal while accelerating to about 75 mph to pass a truck and my headlights went out. I accidently forced the high beam on by flipping the turn/high beam lever and I held the lever in that position until I could return to the right lane behind the truck and stop on the roadside. To say I thought I was going to die is not simply drama. The worst part was not knowing if my brake lights were working. While off the road, I could not duplicate the failure. I put on the low beam and proceeded on I-81. After some miles, I again tried the left turn signal and again the lights went out. This time I was ready, and used the high beam lever to get to the roadside. Again I could not duplicate the failure. I exited as soon as possible, running on low beam, and the lights went out again on the ramp when I operated the left turn signal. I continued to ocala by way of atlanta, running in daylight only. I took the car to ocala Ford as soon as I arrived in ocala. The dealer had the car several days and finally duplicated the failure. They replaced a module at the cost of $786 and said the car was safe to drive. No repair was done to the turn signal. I got the module from the dealer and sent it to NHTSA for testing to determine if it actually was defective. If not, then my car presents a risk to everyone sharing the highway with me at night, because the problem would still be there. In my opinion, sudden and catastrophic failure such as this presents fatal risk to anyone involved in a crash, including the general public. This failure has nothing to do with reasonable wear and tear, it is a design/manufacturing defect, worsened by a failure by Ford to provide a diagnostic program. Since the problem is intermittent, people may have already died and no trace of the failure would be found by examining the wreck. Updated 01/19/11/ updated 01/20/11

- Ocala, FL, USA

problem #10

Aug 202010

Grand Marquis

  • 41,000 miles
The headlights of my 2005 Mercury Grand Marquis suddenly went off and the only way to continue traveling was to hold the high beam flash lever. According to Ford it is the automatic headlight controller and it cost 900 to repair. I almost crashed during a rain storm when the lights suddenly went off and unable to get them to come back on. Driving with high beams on is dangerous and having to hold the flash lever while driving causes a safety issue as well.

- N Ft Myers, FL, USA

problem #9

Jul 132010

Grand Marquis

  • 77,279 miles
2005 Grand Marquis - headlights go off when driving. You hear a click and sometimes they come back on and sometimes they don't. extremely dangerous to be driving down the road in the dark and to have your headlights go out. The Ford dealership advised me that it was the lighting control module that was bad. They charged me $143.75 to tell me this, then they wanted another $930 to replace it. Even though I have an extended warranty, I was advised that this particular module is not covered. I am now only driving this vehicle in the day time.

- Hawkinsville, GA, USA

problem #8

Feb 122010

Grand Marquis 8-cyl

  • 50,000 miles
My 2005 Mercury Grand Marquis has automatic headlights which switch off leaving you driving in the dark. This has happened several times and when it does happen the lights do not work on manual and won't reset for several minutes. I am told through several forums that this is a lighting control module problem that Ford Motor Company is well aware of. I am also told the repair without additional cost of diagnosis and installation runs between $400 & $600 dollars. I feel this is a serious safety issue that Ford Motor Company is ignoring.

- Davenport, FL, USA

problem #7

Apr 122010

Grand Marquis 8-cyl

  • 74,000 miles
My wife was driving our 2005 Mercury Grand Marquis after dark and the low beam headlamps went out. Fortunately she was close to her destination and was able to navigate with the street lights. I don't want to think what may have happened on the interstate had she been heading home. Everything checks out fine except for the light control module. Dealership says this is a common problem and will cost about $500 for the part and $200 labor. We currently do not drive this car at night until we have enough money saved to get the repairs done. Someone is going to die because of this (if it already hasn't happened - we were fortunate).

- Cement City, MI, USA

problem #6

Feb 152010

Grand Marquis

  • 53,000 miles
Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6) I would like to report a serious safety issue with my 2005 Mercury marquis. The headlights go off after a few minutes. They will not come back on for at least 30 minutes. This is when the light switch is turned on. The other lights stay on (parking and taillights), but the headlights go off. I did a google search on this situation today, and learned that this is occurring on several year models of Mercury Grand Marquis and Ford victorias. The problem is described on the internet as a faulty circuit board in the lcm (light control module). I took my Mercury to a Ford/Mercury dealer today for a diagnostic test, which confirmed: "diag pin test isolated to erratic relay internal to lcm modu" to replace this part, I was quoted almost $800 by the dealer, installed (part price is $511). I called Ford/Mercury customer service today, 800-241-3673, and learned that there have been no recalls (tel. Call ref. [xxx]). the Ford representative gave me your website. This is a very serious problem, to be driving and have headlights suddenly go off, and remain off. It started approximately Feb. 15 and continues to present.

- Albuquerque, NM, USA

problem #5

Jun 012009

Grand Marquis

  • 91,000 miles
Back in June of this year, our low beam headlights stopped working and our dealership said it would cost over $700 to fix the problem on our 2005 Mercury Grand Marquis gs sedan. I have been out of full time work since December 2008 and I don't have the money to get it repaired. Is there any other complaints against Ford for this problem?

- Hollywood, FL, USA

problem #4

Sep 302009

Grand Marquis 8-cyl

  • Automatic transmission
  • 65,000 miles
The contact owns a 2005 Mercury Grand Marquis. While driving the exterior lights intermittently failed. As a consequence, his visibility was impaired. He was in the process of taking the vehicle to the dealer for inspection. The vehicle identification number was available. The failure and current mileages were 65,000. Updated 11/10/09 the lighting control module was replaced. The dealer stated it was bad. Updated 11/13/09.

- Duluth, MN, USA

problem #3

Dec 032007

Grand Marquis 8-cyl

  • miles
2005 Mercury Grand Marquis caught fire. Consumer states the engine ignited the fire when she turned into a parking lot. She stated that there was no apparent reason for the fire. The consumer was informed the fire was due to an electrical defect.

- Charlotte, NC, USA

problem #2

Apr 042006

Grand Marquis 8-cyl

  • Automatic transmission
  • 9,500 miles
: the contact stated while exiting the vehicle, the occupants get shocked by static electricity from the door. The dealership suggested fabric softener be sprayed in the vehicle, but this has not remedied the problem.

- Elizabethtown, KY, USA

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