Problems · by component
2004 Mercury Mountaineer power train problems
64 owner complaints to NHTSA about the 2004 Mercury Mountaineer cite power train, 30% of all 210 complaints for this model year.
Complaints
64
30% of all complaints
Crashes
4
Reported by owners
Fires
1
Reported by owners
Injuries
3
Reported by owners
What owners say about the power train
Verbatim from NHTSA complaints, newest first
“This vehicle is has a power train problem from day one with the 5R55S/W transmission and AWD transfer case. I purchased this vehicle where it stranded my family over 200 miles from home and it's a non running car. This vehicle should have been removed from being sold with this defect and crushed! I will never buy a FoundOnRoad Dead ford pos ever. The transmission went into neutral with out any notice. To repair the faulty drive train I will cost me aprox $2400.00 mileage 152,000 third time the drive train has been worked on.. There tranmissions were failing in a little as 50,000 miles.”
“FAILURE OF FRONT DIFFERENTIAL MOUNT CARRIER BUSHINGS FAILURE LEADING TO TWO TRANSMISSION REBUILTS,TRANSFER CASE REBUILD, AND OVER $5000.00 IN REPAIRS. FAILURE OF CARRIER BUSHINGS WOULD LEAD TO FRONT END LOCKING UP. CAUSING A JACKHAMMER AFFECT ON THE DRIVETRAIN OF THE VEHICLE. TO CLOSE CALLS DUE TO FRONT END LOCKING UP. ACCIDENTS WERE AVOIDED DUE TO DRIVER VIGILANCE. HAVE PICTURES OF BUSHINGS AND WHAT'S LEFT OF THE BUSHINGS.”
“TL* THE CONTACT OWNS A 2006 MERCURY MOUNTAINEER. THE CONTACT STATED THAT WHILE DRIVING 70 MPH, THE VEHICLE LOST POWER WITHOUT WARNING. THE VEHICLE WAS MERGED TO THE SIDE OF THE ROAD WHERE IT WAS RESTARTED. HOWEVER, THE VEHICLE FAILED TO ACCELERATE PAST 35 MPH. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHERE THE TECHNICIAN DIAGNOSED THAT THE POWER TRAIN NEEDED TO BE REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE ISSUE. THE FAILURE MILEAGE WAS 99,000. THE VIN WAS NOT AVAILABLE.”
“TRANSMISSION SOLENOIDS THREE TIMES, PAINT COMING OFF, PASSENGER SEAT TRIM CAME OFF, CRACKED REAR LIFT GATE, PASSENGER FRONT AND REAR DOOR WINDOWS, AND DRIVER SIDE REAR DOOR WINDOW DO NOT WORK. *TR”
“I HAD PICKED UP MY KIDS FROM DAYCARE AND I PUT MY VEHICLE IN REVERSE AND BACKED UP. WHILE BACKING UP I HEARD A LOUD POP AND I GOT OUT TO SEE BUT THERE WAS NOTHING VISIBLE. SO I PUT THE VEHICLE IN DRIVE AND AS I WAS GOING DOWN THE STREET MY VEHICLE AXLE BROKE AND MY TRUCK HIT THE STREET IN THE MIDDLE OF TRAFFIC. I TOOK IT TO THE FORD DEALERSHIP AND THEY SAID IT WAS MY AXLE AND MY DIFFERENTIAL HAD BROKEN ALSO, AM I AM LUCKY THAT I DIDN'T HAVE A BAD ACCIDENT WITH THE EXTEND OF THE DAMAGE OF THE DIFFERENTIAL. AFTER I FIXED THAT AND IT COST $2900. THAT STILL DID NOT FIX THE PROBLEM AND I HAD TO REPLACE THE TRANSFER CASE. THEN ALL THREE OF MY CADILLAC CONVERTERS HAD TO BE REPLACED. I HAVE HAD PROBLEM AFTER PROBLEM AND OH YEAH THE BACK REAR GATE HAS BEEN CRACKED LIKE THE MONTH AFTER I BOUGHT IT. *TR”
“TL* THE CONTACT OWNS A 2004 MERCURY MOUNTAINEER. THE CONTACT STATED THAT WHILE DRIVING AT VARIOUS SPEEDS, THE VEHICLE EXHIBITED A FORWARD JERKING MOTION. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE SOLENOID BODY WAS DEFECTIVE AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED BUT THE DEFECT WAS NOT REMEDIED. THE MANUFACTURER WAS NOT NOTIFIED. THE FAILURE MILEAGE WAS 31,000. UPDATED 5/15/14*CN..UPDATED 05/21/14 *BF UPDATED 06/2/2014 *JS UPDATED 8/17/17*CN”
Showing 6 of 64 reports. Read every report on NHTSA.gov.
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026NHTSA vehicle page
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.