2003 Mercury Grand Marquis Vehicle speed control Problems
- Complaints
- 27about this part
- Share
- 7%of 362 total for the year
- Median mileage
- 25,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 27 complaints about the vehicle speed control of the 2003 Mercury Grand Marquis, 7% of the 362 complaints for this model year. Where a mileage was given, the median is 25,000 miles. 13 of these say a crash was involved, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Sudden acceleration in a 2003 Mercury Grand Marquis. This happened after putting the vehicle in drive, it took off at an excessive rate of speed crossed a street and jumped two curbs about 15 inches high within 5 or 6 seconds. My thoughts were what is happening? & brake or you are going to die thank god this vehicle drown in hurricane katrina. I called your ofc in 2004 after this happened and was sent a form to fill out and return to you which I never did. However, with the toyota recall it disturbs me that my ford did the same thing. …”
NHTSA complaint #10303107, filed 2010-01, 20,000 miles“- on 12/20/06 while exiting the driveway his 2003 Mercury Grand Marquis rear ended another vehicle. The contact try to apply the break pedal, but couldn't get the vehicle to stop on time because the brake pedal is 4 inches higher than the accelerator pedal. The contact is concern for safety, because he has experience the same incident several of times.”
NHTSA complaint #10178430, filed 2007-01, 18,000 miles“The engine revved in full throttle when the gear shifter was shifted into drive from park; resulting in a rear end collision. This occurred while in stop and go traffic in the car wash line. The repair shop failed to determined what caused the failure, but the consumer feels due through their own research that it was caused by the electrical system/cruise control.”
NHTSA complaint #10111348, filed 2005-03, 10,000 miles“Vehicle suddenly zoomed forward while leaving a parking lot. On several occasions, the consumer experienced sudden acceleration with the vehicle. The dealership checked all the linkages and pedal assembly but was unable to diagnose the defect which caused this dangerous condition.”
NHTSA complaint #10057280, filed 2004-01, 1,828 miles“2003 Grand Marquis developed problems with the alternator, the throttle sticking open and alignment problems. There was also a rattle noise coming from the engine and the digital readout on the dash was not reading properly.”
NHTSA complaint #10134487, filed 2005-08, 1,000 milesVehicle speed control: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2010 | 3 | 12% |
| 2009 | 4 | 15% |
| 2008 | 15 | 19% |
| 2007 | 13 | 14% |
| 2006 | 37 | 26% |
| 2005 | 39 | 8% |
| 2004 | 23 | 7% |
| 2003 | 27 | 7% |
| 2002 | 17 | 22% |
| 2001 | 27 | 17% |
| 2000 | 13 | 8% |
| 1999 | 12 | 7% |
| 1998 | 9 | 6% |
| 1997 | 24 | 8% |
| 1996 | 19 | 8% |
| 1995 | 23 | 13% |
| 1994 | 33 | 21% |
| 1993 | 19 | 13% |
| 1992 | 31 | 12% |
| 1991 | 12 | 15% |
| 1990 | 9 | 16% |
| 1989 | 14 | 24% |
| 1988 | 12 | 16% |
| 1987 | 7 | 16% |
| 1986 | 1 | 5% |
| 1985 | 4 | 19% |
| 1984 | 4 | 27% |
| 1983 | 1 | 14% |
Other parts of the 2003 Mercury Grand Marquis
207 complaintsElectrical system
51 complaintsSteering
28 complaintsSuspension
28 complaintsEngine cooling
13 complaintsTransmission and drivetrain
12 complaintsAir bags
11 complaintsFuel system
10 complaintsVisibility (wipers, defrost, mirrors)
10 complaintsWheels
10 complaintsBody and structure
9 complaintsBrakes
7 complaints
← All problems reported for the 2003 Mercury Grand Marquis
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 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