There are 8 owner-reported powertrain & transmission complaints for the 2004 Mercury Grand Marquisin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
TL* THE CONTACT OWNS A 2004 MERCURY GRAND MARQUIS. THE CONTACT STATED THAT THE VEHICLE WAS TAKEN IN FOR SERVICE AND IT WAS DETERMINED THAT THE UPPER INTERMEDIATE DRIVE SHAFT WAS STARTING TO SEPARATE. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 88,000.
TL* THE CONTACT OWNS A 2004 MERCURY GRAND MARQUIS. THE CONTACT STATED THAT WHILE COMPLETING A TURN, THE VEHICLE EXHIBITED AN ABNORMAL GRINDING. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC FOR DIAGNOSIS WHERE IT WAS STATED THAT THE PIN BEARING NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED AND THE MANUFACTURER WAS NOTIFIED. THE APPROXIMATE FAILURE MILEAGE WAS 66,000. ...UPDATED 12/03/13 *BF THE CONSUMER STATED THE VEHICLE'S LIGHTS TURN OFF AT NIGHT, AS WELL. UPDATED 12/6/2013 *JS
DT*: THE CONTACT STATED WHILE SHIFTING FROM DRIVE TO PARK THE GEAR LOCKED IN REVERSE AND WHILE DRIVING AT LOW SPEEDS AT NIGHT THE HEADLIGHTS WOULD NOT GO FROM LOW BEAM TO HIGH BEAM. ADDITIONALLY, THE TIRES SLOWLY DEFLATE. THE DEALERSHIP WAS ALERTED. THEY REPAIRED THE GEAR COLUMN, HEADLIGHT SWITCH AND SUGGESTED TO CHECK THE TIRES WEEKLY AND ADD AIR.
STOPPED AT RED LIGHT. ENGINE STOPPED. COULD NOT RESTART. WAS TOWED TO LINCOLN/MERCURY DEALER. DIAGNOSIS INDICATED FAILURE OF POWERTRAIN COMMAND MODULE. ACCORDING TO SERVICE MANAGER THIS FAILURE COULD TAKE PLACE AT ANY TIME OR PLACE AND AT ANY SPEED. SUBSEQUENT TO THIS THE HEATER MOTOR BLOWER CONTROL UNIT FAILED.*JB
DT*: THE CONTACT STATED WHILE APPROACHING A STOP UNDER NORMAL BRAKING, THE VEHICLES ENGINE REVS AND SURGES FORWARD. THE BRAKE PEDAL MUST BE DEPRESSED TO THE FLOOR TO STOP THE VEHICLE. THIS HAPPENED 5 TIMES AND THE VEHICLE WAS INSPECTED BY THE DEALER HOWEVER; THE PROBLEM COULD NOT BE DUPLICATED. THE VEHICLE WAS DRIVEN OVER 6,000 MILES WHEN THE PROBLEM RETURNED. IT WAS TAKEN BACK TO THE DEALER FOR SERVICE AND AGAIN THE DEALER WAS UNABLE TO DUPLICATE THE PROBLEM. *AK THE CONSUMER BELIEVED THERE IS A PROBLEM WITH THE TRANSMISSION. UPDATED 04/06/06. *JB
MY CAR A MERCURY GRAND-MARQUIS(2004), ON OCTOBER 14,2004 ALMOST CAUSED TO MY WIFE AND MYSELF A TRAGEDY.IN MY OWN HOME, THE CAR FAILED IN TRANSMISSION TO GO REAR, INSTEAD WENT FORWARD INTO MY BACKYARD,CRASHED AGAINST A TREE AND WENT INTO A LAKE IN MY PROPERTY. AS A RESULT THE CAR WAS TOWED TO ALAN FORD IN BLOOMFIELD HILLS,MI FOR RAPAIRED WITH DAMAGES OVER $14.000.I MADE THE A COMPLAIN BY PHONE TO THE NHTSA AND PROMISSED A LETER PEPLY WHICH NEVR HAPPENED AND FOLOW UP CALLS IT WAS INFORMED TO ME THAT THERE WAS NEVER A RECORD OF MY CALL.*AK
NEW 2004 MERCURY MARQUIS. HAD CAR FOR ONE DAY. ATTEMPTED TO MAKE A QUICK LEFT TURN BY DEPRESSING ACCELERATOR TO THE FLOOR. MOTOR STARTED REVVING UP BUT THE CAR WOULD NOT MOVE. LET OFF GAS AND TRANSMISSION ENGAGED. AFTER MAKING THE TURN,STOPPED THE CAR, STILL IN DRIVE, PUT THE GAS PEDAL TO THE FLOOR. THE ENGINE WENT INTO HIGH REVS AND THE CAR MOVED VERY SLOW,RELEASED THE GAS AND THE TRANSMISSION ONCE AGAIN ENGAGE. TOOK CAR BACK TO DEALER AND THEY ARE REPLACING THE TRANSMISSION. *JB
THE TRANSMISSION KEEPS STALLING ON UPGRADES.. IT STALLS ON GRADES AFTER THE FIRST WEEK...THE TRANSMISSION WILL NOT HOLD UP UNDER PRESSURE....IT CONTINUES TO LOSE PRESSURE...POWER...IT MUST BE RECALLED.. THE FIRST ONE I HAD I THOUGHT SHOULD BE RECALLED BUT THE DEALERSHIP GAVE ME ANOTHER AFTER 8 MONTHS....IT IS DOING THE SAME THING PLEASE SOMEBODY HELP I WILL GO EVERYWHERE I KNOW AND MAKE THIS PUBLIC UNTIL THIS IS RESOLVED. *AK
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 25, 2026