2004 Mercury Grand Marquis Interior lighting Problems
- Complaints
- 6about this part
- Share
- 2%of 348 total for the year
- Median mileage
- 91,500miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the interior lighting of the 2004 Mercury Grand Marquis, 2% of the 348 complaints for this model year. Where a mileage was given, the median is 91,500 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The contact owns a 2004 Mercury Grand Marquis. The contact stated that while driving 30 MPH at night, the headlights and the interior lights would suddenly malfunction and stop illuminating, increasing the risk of a crash. The vehicle was taken to an authorized dealer, where a diagnostic test indicated that the head light control module was faulty. The contact did not have the headlight control module replaced. The failure mileage was 150,000.”
NHTSA complaint #10419649, filed 2011-08, 150,000 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..... …”
NHTSA complaint #10495329, filed 2013-01, 80,000 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”
NHTSA complaint #10369734, filed 2010-12, 70,000 miles“Toe of left foot hits plastic panel directly to the left of the brake pedal when moving left foot to the brake pedal. Insufficient clearance above left foot due to the plastic panel that covers the courtesy light bulb.”
NHTSA complaint #10122375, filed 2005-05“The interior lights are unable to light up, preventing the consumer from seeing the speed indicator, oil, and fuel gauges. Manufacturer has been notified by consumer.”
NHTSA complaint #10117576, filed 2005-04Interior lighting: other model years
Other parts of the 2004 Mercury Grand Marquis
207 complaintsSteering
65 complaintsElectrical system
40 complaintsVehicle speed control
23 complaintsVisibility (wipers, defrost, mirrors)
11 complaintsEngine cooling
10 complaintsTransmission and drivetrain
9 complaintsBody and structure
8 complaintsBrakes
7 complaintsAir bags
6 complaintsFuel system
6 complaintsTires
5 complaints
← All problems reported for the 2004 Mercury Grand Marquis
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology