Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
Limited mileage data: 15 of 22 reports include usable mileage. There isn’t enough coverage to show a useful chart.
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
Seats. Review the 6 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
Steering. Review the 6 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
Vehicle Speed Control. Review the 4 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
1 crash reports4 fire reports2 injury reports
What owners actually said
22 reports
62,000 miles · Dec 11, 2007
Steering
TL*THE CONTACT OWNS A 2003 MERCEDES BENZ ML320. THE CONTACT EXITED AN OFFRAMP AT 10 MPH AND THE VEHICLE CAME TO A COMPLETE STOP. WHEN SHE ATTEMPTED TO ACCELERATE, SHE LOST ALL POWER STEERING ABILITY. SHE WAS ABLE TO DRIVE HOME AND LATER HAD THE VEHICLE TOWED TO THE DEALER. THE DEALER STATED THAT THERE WAS A LEAK IN THE POWER…
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TL*THE CONTACT OWNS A 2003 MERCEDES BENZ ML320. THE CONTACT EXITED AN OFFRAMP AT 10 MPH AND THE VEHICLE CAME TO A COMPLETE STOP. WHEN SHE ATTEMPTED TO ACCELERATE, SHE LOST ALL POWER STEERING ABILITY. SHE WAS ABLE TO DRIVE HOME AND LATER HAD THE VEHICLE TOWED TO THE DEALER. THE DEALER STATED THAT THERE WAS A LEAK IN THE POWER STEERING UNIT AND ONE OF THE O-RINGS NEEDED TO BE REPLACED. THE VEHICLE IS CURRENTLY AT THE DEALER, BUT THE CONTACT FEELS THAT IT IS A MANUFACTURER DEFECT. THE CURRENT AND FAILURE MILEAGES WERE 62,000.
NHTSA ODI #10211473
Mileage unknown · Nov 20, 2007
Electrical SystemPower Train
2003 MERCEDES BENZ ML320 DEFECTS WITH TRANSMISSION AND COMPUTER UNIT. CONSUMER STATES THAT THE VEHICLE HAS BROKEN DOWN TWICE BECAUSE OF THESE DEFECTS AND THINKS THIS VEHICLE SHOULD BE CONSIDERED A LEMON. *KB
NHTSA ODI #10210503
Mileage unknown · Dec 6, 2005
SeatsInjury
THE HEATED SEAT IN MY 2003 MERCEDES ML320 BURNED THROUGH MY LEATHER SEATS AND LEAVING A SMALL MARK ON MY LEFT THIGH. MY INJURY HEALED; HOWEVER, THERE IS STILL A BURNT MARK ON MY SEAT. AFTER EXPLAINING IT TO MERCEDES AND MY EXTENDED WARRANTY SERVICE, BOTH DECIDED TO HELP ME STATING IT WAS A COSMETIC DEFECT. NOW I'M STUCK WITH…
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THE HEATED SEAT IN MY 2003 MERCEDES ML320 BURNED THROUGH MY LEATHER SEATS AND LEAVING A SMALL MARK ON MY LEFT THIGH. MY INJURY HEALED; HOWEVER, THERE IS STILL A BURNT MARK ON MY SEAT. AFTER EXPLAINING IT TO MERCEDES AND MY EXTENDED WARRANTY SERVICE, BOTH DECIDED TO HELP ME STATING IT WAS A COSMETIC DEFECT. NOW I'M STUCK WITH A DRIVER SIDE SEAT THAT HAS 3 CM HOLE IN IT ALONG WITH HEATED SEATS THAT MERCEDES SUGGEST THAT I SHOULD NEVER TURN ON, EVEN THOUGH I PAID EXTRA FOR IT. *JB
NHTSA ODI #10144571
Mileage unknown · Jul 19, 2005
Seats
I OWN A 2003 MERCEDES ML320, WHILE I WAS DRIVING W/THE HEATED SEATS ON I STARTED TO NOTICE A BURNING ODOR. THE ODOR GOT STRONGER & IT SMELT LIKE BURNING PLASTIC. I NOTICED MY REAR WAS STARTING TO GET A TAD TOO WARM SO I PUT MY HAND DOWN ON THE SEAT & ALMOST BURN MY HAND. I IMMEDIATELY TURNED OFF THE SEAT WARMER & CALLED MERCEDES…
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I OWN A 2003 MERCEDES ML320, WHILE I WAS DRIVING W/THE HEATED SEATS ON I STARTED TO NOTICE A BURNING ODOR. THE ODOR GOT STRONGER & IT SMELT LIKE BURNING PLASTIC. I NOTICED MY REAR WAS STARTING TO GET A TAD TOO WARM SO I PUT MY HAND DOWN ON THE SEAT & ALMOST BURN MY HAND. I IMMEDIATELY TURNED OFF THE SEAT WARMER & CALLED MERCEDES THE FOLLOWING MORNING TO ARRANGE FOR SERVICE. WHEN I ARRIVED AT MERCEDES THE MANAGER INFORMED ME THAT THIS WAS NOT THE FIRST INCIDENT & THAT A GENTLEMENS SUIT HAD BEEN REPLACED B/C IT BURNT THROUGH HIS CLOTHING. I ASKED WHY MERCEDES HAD NOT PUT OUT A RECALL & HE INFORMED ME THAT IT WAS CHEAPER TO JUST REPLACE THE ONE'S WITH PROBLEMS. MY SEATS WHERE REPLACED FREE OF CHARGE & THE OLD ONE'S DISCARDED BY MERCEDES.
NHTSA ODI #10129270
22,600 miles · Dec 3, 2004
SeatsFire
DRIVER'S SEAT HEATER SHORTED OUT WHILE VEHICLE WAS BEING DRIVEN. THE EVENT OCURRED SO QUICKLY AND WAS SO SEVERE THAT IT BURNED THROUGH THE LEATHER SEAT UPHOLSTERY AND A VERY HEAVY PAIR OF DENIM JEANS I WAS WEARING ALMOST IMEDIATELY AND UNEXPECTEDLY. THE CONSEQUENCES ARE PRETTY MUCH OBVIOUS AND COULD RANGE FROM SEVERE BURNS, T…
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DRIVER'S SEAT HEATER SHORTED OUT WHILE VEHICLE WAS BEING DRIVEN. THE EVENT OCURRED SO QUICKLY AND WAS SO SEVERE THAT IT BURNED THROUGH THE LEATHER SEAT UPHOLSTERY AND A VERY HEAVY PAIR OF DENIM JEANS I WAS WEARING ALMOST IMEDIATELY AND UNEXPECTEDLY. THE CONSEQUENCES ARE PRETTY MUCH OBVIOUS AND COULD RANGE FROM SEVERE BURNS, TO THE VEHICLE BURNING TO CAUSING A SERIOUS ACCIDENT BECAUSE OF THE SPONTANEOUS HAPPENING. NO RESPONSE FROM MERCEDES BENZ TO DATE.*AK
NHTSA ODI #10102096
17,000 miles · Sep 30, 2004
SeatsFire
WHILE DRIVING DRIVER'S HEATED SEAT CAUGHT ON FIRE. MANUFACTURER OFFERED TO REPLACE THE VEHICLE WITH A NEWER MODEL.*AK
NHTSA ODI #10094747
20,000 miles · Aug 25, 2004
Air Bags
AIR BAG LIGHT CAME ON INTERMITTENTLY. CONSUMER WAS INFORMED THAT WHEN THAT LIGHT WERE ON THE AIR BAG DID NOT WORK. THE SENSOR WASA REPLACED. HOWEVER, THE PROBLEM RECURRED.*AK
NHTSA ODI #10089697
Mileage unknown · Jun 29, 2004
Fuel System, Other
WHEN FILLING THE VEHICLE WITH FUEL, THE FUEL GAUGE DOES NOT GIVE A PROPER READING. MANUFACTURER SERVICED THE VEHICLE 6-7 TIMES, BUT COULDN'T FIND THE CAUSE OF THE PROBLEM. *AK
NHTSA ODI #10080159
Mileage unknown · Jun 16, 2004
Service Brakes, HydraulicVehicle Speed ControlCrash
WHILE PARKING VEHICLE ACCELERATED. CONSUMER APPLIED THE BRAKE PEDAL BUT THE BRAKES FAILED. THIS CAUSED CONSUMER'S VEHICLE TO COLLIDE WITH THE VEHICLE IN FRONT. THE VEHICLE WAS TAKEN TO THE DEALER FOR INSPECTION. THE CAUSE HAD NOT BEEN DETERMINED. *AK
NHTSA ODI #10079386
14,500 miles · Feb 19, 2004
SeatsInjury
WHILE DRIVING THE VEHICLE HEATED SEATS CAUSED SECOND DEGREE BURNS TO THE DRIVER'S BOTTOM. THERE WAS NO DAMAGE TO THE VEHICLE'S SEAT. THIS PROBLEM ALSO CAUSE SOME REDNESS TO ANOTHER DRIVER'S BOTTOM. *NM AFTER VISITING DOCTOR FOR TREATMENT OF BURNS, TOOK VEHICLE TO DEALER THE SAME WEEK. WAS INFORMED BY THREE DIFFERENT MECHAN…
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WHILE DRIVING THE VEHICLE HEATED SEATS CAUSED SECOND DEGREE BURNS TO THE DRIVER'S BOTTOM. THERE WAS NO DAMAGE TO THE VEHICLE'S SEAT. THIS PROBLEM ALSO CAUSE SOME REDNESS TO ANOTHER DRIVER'S BOTTOM. *NM AFTER VISITING DOCTOR FOR TREATMENT OF BURNS, TOOK VEHICLE TO DEALER THE SAME WEEK. WAS INFORMED BY THREE DIFFERENT MECHANIC'S PROBLEM COULD NOT BE FOUND OR RESOLVED. "PICTURES ENCLOSED" THE VEHICLE SEATS WERE HEATED.
NHTSA ODI #10059309
Official recalls
0
No recalls in this snapshot.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
1
PE05005 · Electric Seat Warmer Overheats/burns
Opened Feb 2, 2005 · Closed Jun 29, 2005
Status: closed (inferred from source dates) · Seats:front Assembly:seat Heater/cooler
THIS INVESTIGATION WAS OPENED BASED ON THREE CONSUMER COMPLAINTS OF ELECTRIC SEAT WARMER OVERHEATING IN MY 2003 MERCEDES BENZ ML-320 VEHICLES.CONSUMERS ALLEGED THAT SUCH FAILURES MAY INFLICT BURN INJURIES TO SEAT OCCUPANTS.INVESTIGATION DISCLOSED THAT THE IDENTICAL SEAT WARMER DESIGN WAS INSTALLED IN 65.5 PERCENT OF ALL M-CLASS VEHICLES PRODUCED DURING MY 2000-2005.THE ALLEGED DEFECT RESULTED FROM BREAKAGE OF THE ELECTRICAL BUS WIRE OF THE HEATER GRID IN THE OUTBOARD SIDE OF THE SEAT BOLSTER.THE FAILURES WERE CAUSED BY REPEATED HIGH STRESS APPLIED DURING OCCUPANT INGRESS AND EGRESS.A SIMILAR FAILURE MODE HAD BEEN PREVIOUSLY IDENTIFIED IN INVESTIGATIONS OF THIS TYPE OF FAILURE IN OTHER VEHICLES.THE RATES OF COMPLAINTS AND WARRANTY CLAIMS FOR THE SUBJECT VEHICLES, AS WELL AS FOR OTHER M-CLASS VEHICLES WITH THE SAME SEAT WARMER DESIGN, WERE IN SOME CASES HIGHER, BUT ON THE SAME ORDER OF MAGNITUDE AS THE RATES SEEN IN OTHER VEHICLES INVESTIGATED.THE INFORMATION DISCLOSED THAT SEAT CUSHION DAMAGE WAS LIMITED TO SMALL, LOCALIZED AREAS AND THAT NO RISK OF FIRE EXISTED.THE INJURIES REPORTED WERE CONSISTENTLY VERY MINOR IN SEVERITY AND AT RATES COMPARABLE TO THOSE SEEN ON OTHER INVESTIGATIONS.ODI CONCLUDED THAT A SAFETY-RELATED DEFECT TREND WAS NOT IDENTIFIED IN THIS MATTER AT THIS TIME.ACCORDINGLY, THIS PE HAS BEEN CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.
2003 Mercedes Benz ML320 Problems, Complaints & Recalls | Skip That Year
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