There are 3 owner-reported speed control & cruise complaints for the 2009 Mercury Grand Marquisin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TL* THE CONTACT OWNS A 2009 MERCURY GRAND MARQUIS. WHILE DRIVING 30 MPH, THE VEHICLE FAILED TO RESPOND WHEN THE BRAKE PEDAL WAS DEPRESSED AND THE VEHICLE INDEPENDENTLY ACCELERATED. THE CONTACT WAS ABLE TO STOP THE VEHICLE BY SWITCHING TO THE PARK POSITION. THE VEHICLE WAS TAKEN TO A DEALER WHERE IT WAS DIAGNOSED, BUT THE CONTACT WAS UNAWARE OF THE DIAGNOSIS. THE VEHICLE WAS REPAIRED, BUT THE FAILURE RECURRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 37,000.
TL* THE CONTACT OWNS A 2009 MERCURY GRAND MARQUIS. THE CONTACT STATED THAT WHILE THE BRAKES WAS ENGAGED THERE WAS AN SUDDEN INCREASE ON ENGINE RPMS. THE CONTACT MENTIONED THAT THE REAR WHEELS STARTED TO SPIN AND IN ORDER TO STOP IT HE HAD TO SHIFT INTO NEUTRAL. THE VEHICLE WAS TAKEN TO THE DEALER WHO WAS UNABLE TO DUPLICATE THE FAILURE. THE FAILURE MILEAGE AND CURRENT MILEAGE WAS 33,000.
TL* THE CONTACT OWNS A 2009 MERCURY GRAND MARQUIS. HE APPLIED PRESSURE TO THE BRAKE PEDAL WHEN ATTEMPTING TO PARK THE VEHICLE, BUT IT LURCHED FORWARD. THE VEHICLE CRASHED THROUGH THE GARAGE WALLS INTO THE ADJACENT ROOM. THERE WAS NO PERSONAL INJURY. THERE WERE DAMAGES TO THE WALLS AND FURNITURE WHICH OCCUPIED THE ADJACENT ROOM. THE FRONT END OF THE VEHICLE SUSTAINED MODERATE DAMAGES. THE VEHICLE WAS TOWED TO AN AUTHORIZED DEALER FOR DIAGNOSTIC TESTING. THE VEHICLE WAS REPAIRED FOR THE BODY DAMAGES. THE TECHNICIAN WAS UNABLE TO DETERMINE THE CAUSE OF FAILURE. THE FAILURE AND CURRENT MILEAGES WERE 10,000. UPDATED 11/23/09 *BF UPDATED 11/24/09
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026