2005 Mercury Grand Marquis: common problems

Owners of the 2005 Mercury Grand Marquis filed 488 complaints with NHTSA, most often about exterior lighting and electrical system. Details by component below, with sources.

Key figures

Owner complaints: 488
involving a crash: 24

What fails most often

1 Exterior lighting 60% of all complaints
2 Electrical system 15% of all complaints
3 Air bags 14% of all complaints
4 Vehicle speed control 8% of all complaints
5 Seat belts 7% of all complaints
6 Steering 4% of all complaints
7 Service brakes 3% of all complaints
8 Structure 2% of all complaints

Circle size and colour show each component’s share of NHTSA complaints. Schematic only, not a drawing of the exact model.

Exterior lighting: 293 complaints (60% of all), 2 of them with a crash reported by the owner.
Electrical system: 75 complaints (15% of all), 4 of them with a crash reported by the owner.
Air bags: 67 complaints (14% of all), 5 of them with a crash reported by the owner.
Vehicle speed control: 39 complaints (8% of all), 13 of them with a crash reported by the owner.
Seat belts: 36 complaints (7% of all).

Engines and transmissions

US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.

4.6 L · petrol · 8 cyl
automatic, 4-speed

Drive: RWD

Symptoms owners describe

How many of the 488 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).

headlights and tail lights238 · 49%
airbag warning light55 · 11%
warning lights, check engine47 · 10%
seat belts44 · 9%
A/C or heater9 · 2%
smoke, burning smell, fire9 · 2%
windows, sunroof9 · 2%
knocking, grinding or other noise7 · 1%
airbags did not deploy6 · 1%
stalls while driving6 · 1%

Components owners complain about

Component	Owner complaints	involving a crash
Exterior lighting	293	2
Electrical system	75	4
Air bags	67	5
Vehicle speed control	39	13
Seat belts	36	0
Steering	20	1
Service brakes	17	3
Structure	11	1
Visibility	11	0
Engine and cooling	9	2
Tires	8	1
Engine	5	0
Powertrain	5	0
Electronic stability control	2	0

What owners report

Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.

I was driving along when my tire blew out. The car spun into traffic and hit a wall and guard rail but did not hit any cars. My whole front end was smashed in and long the one side of the car scrapped up. The air bags did not deploy!!! Information redacted pursuant to the freedom of information act (foia), 5 u.s.c.
Air bags · crash · 2014-04-02 · NHTSA complaint #10576886
Similar to events as published in nhtsa action number pe08066, I was driving on the interstate at night and the headlights suddenly went dark. No warning, just went out. Pulled off onto shoulder and could not avoid sliding off the road - very dangerous.
Exterior lighting · crash · 2014-02-11 · NHTSA complaint #10563912
My daughter and I were rear ended and our 2005 mercury grand marquis gs airbags never deployed in spite of being hit three times by a delivery driver with a box truck at the intersection of pembroke and dixie highway in hollywood. I just learned on national tv that ford obtained fake airbags from suppliers in china.
Air bags · crash · 2012-10-12 · NHTSA complaint #10479891
Both driver and front seat passenger suffered severe bruising on face, arms, chest and abdomen, presumably from deployment of the air bags as well as from the seat belts. Rear seat passenger suffered a contusion on the forehead and a sprained hand.
Vehicle speed control · crash · 2009-05-26 · NHTSA complaint #10269914
Airbags did not deploy. Had experienced slight acceleration on a previous occasion, which was discussed with my mechanic. ( had also had this problem on my 1999 ranger which was resolved by replacing iac motor.) vehicle currently in dealers shop, where service personnel are unable to replicate occurrence nor find…
Service brakes · crash · 2008-05-15 · NHTSA complaint #10227879
Air bags did not deploy. Clouds of smoke behind my car and tire marks on roadway confirmed brake pedal, not accelerator, was depressed. Car experienced a slight overspeed on a previous occasion.
Air bags · crash · 2008-05-14 · NHTSA complaint #10227779
As a result, the windows were damaged, the front seats, where the occupants were seated, while wearing the seat belts, were thrown to the rear portion of the vehicle.
Vehicle speed control · crash · 2008-01-02 · NHTSA complaint #10213409
The failure caused her to crash into a fire hydrant. The driver sustained a broken back and the front seat passenger sustained a bruised bowel and internal bleeding. The vehicle was destroyed. As of july 16, 2007, the dealer has been unable to diagnose the cause of failure.
Vehicle speed control · crash · 2007-07-16 · NHTSA complaint #10196523

When owners complained

NHTSA complaints by filing year. The peak shows at what age the problems show up most.

200513
200616
20079
20089
200920
201035
201136
201260
201358
201465
201537
201625
201726
201821
201918
20207
20212
20227
20238
20245
20259
20262

Comparison

By complaint count this model year ranks 769 of 36,656 model years in the NHTSA data (top 2% most complained about).

On average one model year of the Grand Marquis has 117 complaints (34 years in the data). This year has 488, above average.

What to check before buying

Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
Vehicle speed control. Accelerator pedal, cruise control, throttle codes.

Other years of this model

Questions and answers

What are the most common problems with the 2005 Mercury Grand Marquis?

Owner complaints to NHTSA most often mention: exterior lighting, electrical system, air bags. Total complaints: 488. The most frequent symptoms in complaint texts: headlights and tail lights (49%), airbag warning light (11%), warning lights, check engine (10%).

How many service bulletins (TSB) were issued for the 2005 Mercury Grand Marquis?

NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.

Should I buy a 2005 Mercury Grand Marquis from a US auction?

Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.

Other 2005 models

Read also

Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.