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2003 Mercury Grand Marquis problems

The most common problem on the 2003 Mercury Grand Marquis is lights, typically around 96,000 miles. It has 3.8 times the complaints of a typical Grand Marquis model year.

Year to avoid3.8x the typical complaints
Year score
27/100
Owner complaints
362
Recalls
1
Service bulletins
90
Worst area
Lights
Fuel economy
18mpg
Typical repair
$600

The worst 2003 Mercury Grand Marquis problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

Problems by type

Tap a problem to see which part fails, at what mileage and in which other years.

Specific symptoms reported on the 2003 Mercury Grand Marquis

Headlights 173Stalling 12Sudden acceleration 12Grinding brakes 7Power steering loss 6Wipers 6

Recalls 1

Exterior lighting: headlightsReported December 22, 2015 · 296,004 vehicles affected
What is wrong
Ford Motor Company (Ford) is recalling certain model year 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles manufactured October 3, 2001, to August 2, 2005. The affected vehicles have a lighting control module (LCM) that may fail, resulting in a loss of headlights.
Risk
A loss of headlights can reduce driver visibility and increase the risk of a crash.
Remedy
Ford will notify owners, and dealers will replace the LCM, free of charge. The recall began April 14, 2017. Owners may contact Ford customer service at 1‑866‑436‑7332. Ford's number for this recall is 15S39.

Recall number 15V861000 · Recall details

See all 1 recalls for the 2003 Mercury Grand Marquis

Defect investigations

Loss of headlightsOpened August 10, 2015, closed January 8, 2016

The Office of Defects Investigation (ODI) opened an investigation concerning the loss of headlights in model year (MY) 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles. The subject vehicles share the same architecture and major components.ODI has received 636 unique reports (for all submission dates) related to the alleged defect, with owners describing a loss of both low and/or high beam headlights occurring while driving.ODI identified 4 Vehicle Owner Questionnaire ( VOQ) reports alleging minor crash or loss of control incidents due to headlight failures.Drivers alleged running off of the road due to a lack of headlights and one driver reportedly struck a deer.No injuries were indicated in the VOQ crashes.In response to ODI's Information Request (IR) letter, Ford Motor Company (Ford) responded with 4173 unique reports related to the alleged problem.There were a total of 11 crashes reported within that group as well as one injury that occurred when the vehicle struck an unseen object on the side of the road when the headlights failed. Ford also submitted 49,843 warranty claims related to headlight failures.Most reports indicate that the headlights failed without warning leaving the driver with no forward lighting, however some noted the headlights flickered or dimmed prior to turning off.Consumers also noted they were able to hold the flash to pass lever on the steering column mounted stalk to activate the high beams however this is only effective as long as the lever is physically actuated.On December 21st, 2015 Ford notified ODI that it would conduct a safety recall (15V‑861) to remedy headlight failures on (MY) 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles.According to Ford, the headlights of the vehicle are controlled by the Lighting Control Module (LCM) located in the engine compartment of the vehicle.The LCM uses an internal relay, mounted to a circuit board, to control power to the headlights. The headlight relay is soldered to the circuit board at six different terminals. The original equipment LCMs were manufactured in a manner that resulted in the solder joints fatiguing and/or cracking as a result of repeated thermal cycling and/or vibration, a defect condition. The condition could be exacerbated by manufacturing quality issues such as an insufficient amount of solder, effecting the continuity between the circuit board and the relay terminal, and resulting in loss of headlights while driving.Other lighting functions are unaffected by this condition.The LCM manufacturing processes were revised to address the defect condition and Ford has been conducting a warranty extension program to cover defective LCMs since late 2013.Under the recall Ford will replace any remaining defective LCMs in recalled vehicles with remedy LCMs once they become available.See the federal safety agency recall 15V‑861 for further details on the safety recall.The recall action initiated by Ford addresses the safety risks of concern to ODI.Accordingly, the investigation is closed.The ODI reports cited above can be reviewed at under the identification (ODI) numbers found in the attached list.

PE15028

Loss of headlamp/exterior lightingOpened April 1, 2015, closed August 11, 2015

In a letter dated October 2, 2014 the Office of Defects Investigation (ODI) was initially petitioned by the North Carolina Consumers Council, Inc. requesting a defect investigation of an alleged defect condition resulting in headlight and/or exterior lighting failure on 2003-2005 Ford Crown Victoria and Mercury Grand Marquis vehicles.ODI analyzed Vehicle Owner Questionnaire (VOQ) complaints received from consumers and identified a total of 605 reports (for all submission dates) alleging headlight failure.The complaints indicate failures of both low beam headlights typically while driving, a defect condition that was evaluated under a prior ODI investigation (PE08066).Most consumer VOQs indicate that the headlights failed suddenly and without warning leaving the driver with no forward lighting, however some report the headlights flickered or dimmed prior to turning off.In some cases drivers were able to turn the headlights back on after a period of time while others reported the headlights would not come back on at all.Consumers noted they were able to hold the flash to pass lever on the steering column mounted stalk to activate the high beams however this is only effective as long as the lever is actuated.ODI identified 4 VOQ reports alleging minor crash or loss of control incidents due to headlight failures.Drivers indicated running off of the road due to a lack of headlights and one driver reportedly struck a deer.No injuries were indicated in the VOQ crashes.In response to ODI's April 7, 2015 Information Request letter, Ford provided data indicating it has received 3,092 complaints of failed headlights related to the Lighting Control Module (LCM), a device that controls the headlights and other lighting functions.This number includes the complaints Ford reviewed and classified as headlight failure due specifically to the LCM.Within Ford's complaints, there are 11 reports alleging a crash occurred.These drivers reported hitting objects, including other vehicles after the headlights failed causing damage to the affected vehicles.One driver was injured when their car struck an unseen object in the road, jerking the steering wheel from their hands and injuring their shoulder.In total 15 crash allegations were identified, all of which have occurred since ODI's prior evaluation of this issue.This petition has been granted.Preliminary Evaluation PE15-028 has been opened to assess the scope, frequency, and safety-related consequences of the alleged defect.The ODI reports cited above can be reviewed at www-odi.the federal safety agency.dot.gov/owners/Sarchreference under the identification (ODI) numbers found in the attached list.

DP15002

Loss of headlight functionOpened November 26, 2008, closed March 24, 2009

The agency has closed this investigation based on its review of complaint reports, field and technical data provided by ford and complainant interviews. Ford found that some lighting control modules (lcm) in the subject vehicles contained defective solder joints on the printed circuit board.this condition can lead to poor headlight performance ranging from intermittent outage and dimming to eventual headlights failure.the failure does not affect other lighting functions (park, emergency flasher, brake and flash to pass lights).the agency is aware of a total of 306 consumers complaints and no report of crash, injury or fatality.ford reports 2,074 warranty claims related to headlight failure linked to the lcm during the first three years of operation.about 12% (247) of these claims are specific to headlight failure while driving.the average warranty rate for headlight failing while driving is low (0.05%).ford reports a slightly higher warranty rate experienced for the crown victoria police interceptor vehicles and this is attributed to the higher duty cycle of these vehicles (headlights on for longer periods).a safety-related defect has not been identified at this time and further use of agency resources does not appear to be warranted.accordingly, this investigation is closed.the closing of this investigation does not constitute a finding by the federal safety agency that a safety-related defect does not exist.the agency will monitor this issue and reserves the right to take further action if warranted by the circumstances.

PE08066

Spark plug ejection from cylinder headOpened September 22, 2005, closed January 4, 2006

On september 6, 2005, odi received a petition requesting that the agency investigate allegations of engine spark plug ejection in certain model year 1997 through 2004 ford vehicles with triton v-8 and v-10 engines.odi received a total of 474 non-duplicative complaints on the subject vehicles where the complainant, or the dealer repairing the vehicle, reported that a spark plug detached from the cylinder and/or ejected from the engine.as of december 8, 2005, odi is not aware of any allegations where the alleged defect resulted in a loss of vehicle control, a crash, an injury, or a fatality in any of the 10,319,810 subject vehicles.in addition, odi is aware of only two incidents where the vehicle stalled without restart.information contained in the odi consumer complaints and obtained from 72 telephone interviews with complainants showed the following:(1) 99% of the complaints were on my 1997 to 2002 subject vehicles.(2) most the complainants reported hearing a loud pop while driving or upon starting up the vehicle followed by a loud, repetitive clicking or popping sound.(3) many of the complainants reported that the popping sound was accompanied by some loss of vehicle power; however, in 99% of the incidents reported, the vehicle did not stall.in the very few incidents where the vehicle did stall, most vehicles could be restarted.(4) only a small percentage of the complainants cited that they smelled gas or a slight burning smell when the incident occurred.(5) in all but a very few incidents, vehicle damage was limited to the engine.in one incident, the complaint reported that the fuel rail was damaged and replaced after one of the spark plugs ejected from the engine; however, the complainant reported that the damage did not result in any type of fuel leak or fire.in another incident, the only incident where a fire was alleged, the complainant reported that no fluid leak was observed, but that a fire resulted after the spark plug had ejected from the engine and he had restarted the vehicle and driven to another location.none of the complainants reported any damage to the vehicle hood.(6) only two complainants reported that they observed what appeared to be some drops of fuel coming from the cylinder where the spark plug had failed or on the spark plug itself; however, each of these complainants reported that there was no smoke or flames as a result of his incident.as the petitioner noted, and odi?s analysis showed, it is possible for a spark plug to detach from the engine cylinder threads in the subject vehicles.however, odi?s analysis of 474 complaints describing such incidents found only a very few alleged any safety-related consequences.none of these showed any evidence of a serious safety consequence.given the large population and relatively long exposure time of the subject vehicles, the complaint analysis indicates that the risk to motor vehicle safety from the alleged defect is very low.in view of the foregoing, it is unlikely that the federal safety agency would issue an order for the notification and remedy of the alleged defect at the conclusion of the investigation requested in the petition.therefore, in view of the need to allocate and prioritize the federal safety agency?s limited resources to best accomplish the agency?s safety mission, the petition is denied.

DP05005

Rear axle fractureOpened January 22, 2004, closed July 8, 2004

This pe was opened after odi became aware of two allegations concerning rear axle fracture and partial wheel separation involving my 2003 ford crown victoria police interceptors (cvpi).initially, the pe's scope involved all my 2003 grand marquis, crown victoria, and lincoln town cars (I.e., panther platform) produced through january 2003.while gathering information about this issue, it became evident that the failures were confined to long-wheelbase lincoln town cars and the cvpi's due to their unique weight distribution and usage profiles.ford's recall addresses these vehicles.both the company and odi are continuing to monitor the field performance of the axles and will take appropriate action as required.

PE04010

Fracture of the steel wheel rimOpened February 25, 2003, closed August 8, 2003

The subject wheel (new for my 2003) is used on crown victoria (cv) and grand marquis.complaint data indicates that wheel failure affects primarily the commercial specification cv model (police and taxi) which has unique design characteristics and is generally subjected to higher usage demands.during ford's analysis, it was determined that cyclic bending moment fatigue could cause rim cracks to occur in the heat affected zone adjacent to the circumferential weld.ford implemented changes in wheel manufacture in september 2002 and introduced a new wheel design with a thicker rim in april 2003.odi found evidence that indicated rapid crack propogation might have occurred in seven wheel failure incidents, two of which lead to tire debeading.ford has announced that 29,946 commercial spec cv vehicles, manufactured prior to the september change, will be recalled to have the april 2003 design wheel installed.odi will continue to monitor for wheel failures in the subject vehicles not covered by the recall.

PE03009

Technical service bulletins for the 2003 Mercury Grand Marquis 90

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

See all 90 bulletins for the 2003 Mercury Grand Marquis

2003 Mercury Grand Marquis fuel economy

Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.

EngineDriveCityHighwayCombined
4.6L 8‑cylRWD162318

What 2003 Mercury Grand Marquis owners say

Most recent owner complaints, unedited.

Filed May 14, 2026 · Lights · FL

While driving my vehicle headlights turn off and back on, sometimes off for minutes sometimes flickering.

Filed May 13, 2025 · Electrical, Lights · 160,000 miles · NY

The contact owns a 2003 Mercury Grand Marquis. The contact that the headlights were intermittently inoperable. Additionally, the contact stated that the instrument panel lights, the brake lights, and the turn signal lights were inoperable. The contact who is a mechanic, had inspected the fuses, the fuse box, and other unknown parts, but found no failures. The dealer was notified of the failure. The vehicle was not diagnosed or repaired. The contact related the failure to the federal safety agency Campaign Number: 15V861000 (Exterior Lighting); however, the VIN was not included. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline for assistance. The failure mileage was approximately 160,000.

Filed May 6, 2025 · Lights · CA

The Lighting Control Module has failed and my brake lights and dash board lights turn off after couple minutes while driving with the lights on. I took my vehicle in to dealer already once for problem to be fixed a year ago. They did repair but now same problem is occurring again. I went back to dealer Sunrise Ford in Fontana and they said recall work is only warranty for 1 year or 12k miles. The work was done in December 2023. They want to charge me $230.00 for diagnostic. But issue is same problem as before. Recall number is 15S39. Driving without brake lights is dangerous and has limited my driving. I cannot go out at night. I do not have another vehicle. This affects my life. I've called other dealers and they refuse to do the work.

Filed Jan 27, 2025 · Lights · 127,000 miles · AL

The contact owns a 2003 Mercury Grand Marquis The contact stated that both the headlamps and the taillights intermittently failed to operate as needed. There were no warning lights illuminated. The vehicle was taken to the dealer and was diagnosed. The dealer placed a processor on the vehicle and rewired the lights however, the failure persisted. The manufacturer was not made aware of the failure. The manufacturer was not made aware of the failure. The failure mileage was 127,000.

Filed Dec 22, 2024 · Electrical, Lights · RI

The headlights shut off without warning

Filed Dec 10, 2024 · Lights · 285,000 miles · RI

The contact owns a 2003 Mercury Grand Marquis. The contact stated that while driving at an undisclosed speed, the front headlights shutoff independently while turned on. No warning light was illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The contact who is an independent mechanic determined that the lighting control module (LCM) needed to be replaced. Upon further investigation, the contact related the failure to the federal safety agency Campaign Number: 15V861000 (Exterior Lighting); however, the VIN was not included. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 285,000.

Filed Sep 24, 2024 · Lights · 100,000 miles · MO

The contact owns a 2003 Mercury Grand Marquis. The contact stated while attempting to pull out of the parking lot, the headlights and the taillights became inoperable. The vehicle was not diagnosed or repaired. The VIN was not included in the federal safety agency Campaign Number: 15V861000 (Exterior Lighting). The manufacturer was notified of the failure. The failure mileage was 100,000.

Filed Sep 3, 2024 · Fuel system, Lights · NJ

Head lights suddenly went out while driving at night causing near accident, happening frequently. Also, the gas tank leaks when I put gas in car, making it smell badly and making it dangerous if someone drops a cigarette near it.

Filed Aug 29, 2024 · Lights · 106,000 miles · NV

The contact owns a 2003 Mercury Grand Marquis. The contact stated that while the vehicle was parked, the contact noticed that the headlights were inoperable. There was no warning light illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the lighting control module had failed and needed to be replaced. The vehicle was not repaired. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to the NHSTA Hotline for assistance. The failure mileage was approximately 106,000.

Filed Jul 18, 2024 · Lights · 181,000 miles · AL

The contact owns a 2003 Mercury Grand Marquis. The contact stated while driving at an undisclosed speed, the headlights failed to operate as needed. The vehicle was taken to an independent mechanic, where it was diagnosed and determined that the lighting control module needed to be replaced. The vehicle was not repaired. The contact stated that the vehicle had previously been repaired under the federal safety agency Campaign Number: 15V861000 (Exterior Lighting). The manufacturer was made aware of the failure and referred the contact to the federal safety agency Hotline for assistance. The failure mileage was approximately 181,000.

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Other model years

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Questions about the 2003 Mercury Grand Marquis

Is the 2003 Mercury Grand Marquis reliable?

Owners have filed 362 complaints about the 2003 Mercury Grand Marquis, 3.8 times a typical Grand Marquis model year. It is one of the years we flag to avoid.

What is the 2003 Mercury Grand Marquis year score?

The 2003 Mercury Grand Marquis scores 27 out of 100 (poor). The score compares it with the other model years of the Mercury Grand Marquis: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.

What is the most common problem with the 2003 Mercury Grand Marquis?

Lights, with 207 complaints, typically around 96,000 miles. Next is electrical (51).

How many recalls does the 2003 Mercury Grand Marquis have?

1 recall, covering exterior lighting.

Was there a recall on the 2003 Mercury Grand Marquis lights?

Yes, 1 recall: 15V861000. Check your VIN to see if your car still needs the free repair.

What year does the Mercury Grand Marquis have the most lights problems?

The Mercury Grand Marquis model years with the most lights complaints are 2005 (293 complaints), 2004 (209 complaints) and 2003 (207 complaints).

What gas mileage does the 2003 Mercury Grand Marquis get?

Official estimates for the 2003 Mercury Grand Marquis range from 18 mpg combined. The most efficient version (4.6L 8-cyl, RWD) gets 16 city and 23 highway.

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