2004 Mercury Grand Marquis Problems

What owners report

Owners of the 2004 Mercury Grand Marquis most often report headlights that cut out while driving at night, frequently traced by dealers or mechanics to the lighting control module, with many complaints filed when recall parts were unavailable. A smaller but recurring group of complaints describes stiff or binding steering, and a few describe coolant leaks from a cracked plastic intake manifold. Reports span a wide mileage range, from under 50,000 to well past 150,000, and the lighting failures usually appear without warning after the car has been in use for years.

1. 1
   Exterior lighting

   Headlights cut out while driving (lighting control module)

   • 161 complaints (46%)
   • median 83,000 mi at 10.0 yrs old (139 state mileage)
   • 5 mention a crash, fire or injury
   • owner-quoted repair $700 (median of 17 quotes)
   • filed 2006–2025

   Complaints describe the low-beam headlights, and sometimes tail lamps, dash lights or instrument cluster, going dark without warning while driving at night. Owners say switching the lights off and on, waiting, or holding the high-beam flash lever is sometimes the only way to get any light, and that high beams may be the only working setting. According to complaints, dealers and independent shops frequently diagnosed a failed lighting control module and quoted several hundred dollars to replace it, and some owners report the problem returning after replacement. Several complaints were filed while the recall remedy was pending because parts were said to be unavailable. Reported across a wide range of mileage, from about 42,000 up to 212,000, typically after several years of use and often during night driving.

   Recall 15V8610001 related service bulletin

   What to check: At night, test the low beams, tail lamps and dash lights and watch for flickering or dropouts; ask whether recall 15V861000 was performed and whether the module or only the harness was replaced.

   2 excerpts from owner complaints in NHTSA records

   “2004 Mercury marquis. After 2-3 hours of driving with the headlights on, they will go out. All other lights continue to work properly. This is a very dangerous situation. I stopped the car and continued with my trip during the daylight. I believe this is a problem with the lighting control module and is a common problem.”

   NHTSA complaint #10268965, filed 2009-05, 85,000 miles

   “We were driving on rte 202 in chalfont, pa and turned onto rte 152 heading south. While driving along an unlit part of the road, the headlights went out. The switch was not working to turn on or off. I went off the road but was able to recover safely. I turned the car around and headed home. Lights came on and off again in about 3 minutes. Lights continue to go off randomly when car is driven at night time.”

   NHTSA complaint #10562434, filed 2014-01, 70,083 miles
2. 2
   Steering

   Stiff, binding or jerky steering

   • 61 complaints (18%)
   • median 85,000 mi at 11.0 yrs old (55 state mileage)
   • 3 mention a crash, fire or injury
   • filed 2007–2023

   Owners describe the steering wheel becoming hard to turn, moving in uneven catches, or failing to return to center, with power steering fluid at the proper level. Some complaints involve a clicking or knocking noise from the steering column, and shops diagnosed a corroded lower steering shaft or collapsed bearing in several cases. A few owners report the wheel nearly seizing, and repairs ranged from fluid service and pump replacement to steering shaft replacement. Reported from as low as 18,500 miles up to about 194,000, often noticed first at low-speed turns.

   What to check: Turn the wheel lock to lock while parked and at low speed and listen for clicking or binding; ask whether the steering shaft, rack or pump has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “2004 Grand Marquis, power steering went out about 2 years ago, around 2016-2017, got it repaired at my expense. Was fine until about 4-5 months ago, started clicking/knocking noise when I turned steering wheel. This happens when stationary and when car is moving at any speed with turns. Also steering wheel does not return to center after turning unless I move it. It is also tight turning at times, feels like it is almost locking up sometimes. Afraid it will lock up and cause an accident. …”

   NHTSA complaint #11257564, filed 2019-09, 100,000 miles

   “Turning the steering wheel became hard with uneven catches (not smooth motion) when turning left or right and also turning the steering wheel back to center . Steering linkage from steering column to the steering box appears to be binding up. This makes turning the steering wheel sluggish and jerky. Power steering fluid and belts were ok.”

   NHTSA complaint #10500115, filed 2013-02, 144,024 miles
3. 3
   Electrical system

   Electrical gremlins: door locks, key fob and battery drain

   • 14 complaints (4%)
   • median 88,000 mi at 9.5 yrs old (12 state mileage)
   • filed 2004–2025

   Owners describe door locks cycling open or closed on their own, clicking from the driver-side dash after shutdown that continues until the battery drains, and repeated jump starts. Some report window switches failing, key fobs or security systems leaving the car unable to start, and warning lights flickering. In some cases the electrical complaints accompany the lighting module failures. Reported from about 86,000 to 150,000 miles, usually as intermittent faults over months.

   2 related service bulletins

   What to check: Check that all door locks and windows work from both the fob and the switches, and ask whether the battery has needed repeated jump starts or been replaced for drain.

   2 excerpts from owner complaints in NHTSA records

   “Sometimes the headlights flick on and off while driving. Then when the car is turned off, there is a clicking noise in the driver side dashboard that continues until it drains the battery. Also, sometimes the door locks cycle open or closed whether the car is driving or off. This has happened multiple times and caused me to replace the battery, and still I have to jump the car from time to time. This has happened several times over the past few years, but only now have I found this site to report it to.”

   NHTSA complaint #11375984, filed 2020-11, 130,000 miles

   “Fuel pump and crankshaft sensor both went out on vehicle at same time. Repair of crankshaft sensor was a $400 and fuel pump repair was $740. Doors do not lock properly when using the key remote and lights inside the vehicle on controls flicker on and off. Heating element in leather seat on passenger side has never worked and had to replace tires due to unusual wear and tear. Cost to replace tires was $478. Driver sides door will not shut all the way due to alignment problems and this problem has not been corrected. …”

   NHTSA complaint #10371083, filed 2010-12, 77,000 miles

Buying note. A used 2004 Grand Marquis is a simple, high-mileage-friendly car, but check the lighting system carefully at night and confirm whether recall 15V861000 work was actually completed. Budget for possible steering shaft or intake manifold repairs on higher-mileage examples.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.