MERCEDES-BENZ M-CLASS · model year

2003 MERCEDES-BENZ M-CLASS

12 NHTSA complaints, 1 crash report for this specific cohort.

NHTSA overall rating

Not crash-tested

New Car Assessment Program

The 2003MERCEDES-BENZM-CLASS carries 12 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 1 crash, 2 fires, 6 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.

Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2003 M-CLASS is electrical system with 4 filings, followed by engine and engine cooling:engine (1) and exterior lighting:headlights (1). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.

NHTSA currently has 1 investigation file overlapping the 2003 M-CLASS. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.

12
Complaints
1
Crashes
2
Fires
6
Injuries
0
Deaths

Total Complaints

12 filings

Crashes Reported

1 reports

Source

NHTSA ODI

Federal complaints database

Complaints vs. fleet median (215)

At or below the fleet median complaint volume.

Complaints by Component

ComponentCount
ELECTRICAL SYSTEM4
ENGINE AND ENGINE COOLING:ENGINE1
EXTERIOR LIGHTING:HEADLIGHTS1
POWER TRAIN:AUTOMATIC TRANSMISSION1
SEATS1
STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS1
SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER1
FUEL SYSTEM, GASOLINE1
ENGINE AND ENGINE COOLING1

Recent Complaints

20111017ENGINE AND ENGINE COOLING

AFTER CHANGING THE SERPENTINE BELT, I HAVE NOTICED THAT THE CRANKSHAFT PULLEY WAS WOBBLING AND THE BELT VIBRATING, I BEEN DOING SOME RESEARCH AND FOUND THAT THERE HAS BEEN A RECALLED FOR THIS ISSUE, DOSE MINE STILL APPLIED TO THIS PROBLEM? IT IS ALREADY OUT OF WARRANTY BUT THIS KIND OF REPAIR IS EXPENSIVE, PLEASE. *TR

20101103FUEL SYSTEM, GASOLINE

WHILE DRIVING IN MODERATE TRAFFIC ENGINE STOPPED. DRIVER (NOT ME) WAS VERY SCARED AND SAID AN ACCIDENT ALMOST OCCURRED AS SHE MANEUVERED TO BREAKDOWN LANE WITHOUT POWER AND NO POWER STEERING. SECOND OCCURRENCE OF SUDDEN ENGINE STOPPAGE WHILE DRIVING WITH LOSS OF ENGINE POWER AND POWER STEERING IN THIS VEHICLE. FUEL PUMP HAD BEEN PREVIOUSLY REPLACED. *TR

Mileage: 42,000

20070814FireSEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER

TL*THE CONTACT OWNS A 2003 MERCEDES-BENZ ML55. WHILE DRIVING 60 MPH HE ENGAGED THE SEAT HEATER. THE FRONT AND REAR SEATS BECAME EXTREMELY HOT. HE WAS UNABLE TO TURN THE HEATER OFF. HE PULLED OVER AND NOTICED SMOKE AND SPARKS. HE POURED WATER OVER THE SEATS AND THE SPARKS STOPPED. THE SEAT HEATER DID NOT GO OFF UNTIL THE KEY WAS REMOVED FROM THE IGNITION. THE VEHICLE WAS TOWED TO THE DEALER. THE DEALER STATED THAT THE COILS MALFUNCTIONED. THE CURRENT AND FAILURE MILEAGES WERE 28,000. THE CONSUMER STATED THE DEALER REPLACED SEAT AND ELECTRICAL COMPONENTS BUT WILL NOT PROVIDE CONSUMER WITH ANY DOCUMENTATION OR INFORMATION PERTAINING TO THE DEFECT AND REPAIR. UPDATED 09/18/07 *TR

Mileage: 28,000

20070814FireELECTRICAL SYSTEM

TL*THE CONTACT OWNS A 2003 MERCEDES-BENZ ML55. WHILE DRIVING 60 MPH HE ENGAGED THE SEAT HEATER. THE FRONT AND REAR SEATS BECAME EXTREMELY HOT. HE WAS UNABLE TO TURN THE HEATER OFF. HE PULLED OVER AND NOTICED SMOKE AND SPARKS. HE POURED WATER OVER THE SEATS AND THE SPARKS STOPPED. THE SEAT HEATER DID NOT GO OFF UNTIL THE KEY WAS REMOVED FROM THE IGNITION. THE VEHICLE WAS TOWED TO THE DEALER. THE DEALER STATED THAT THE COILS MALFUNCTIONED. THE CURRENT AND FAILURE MILEAGES WERE 28,000. THE CONSUMER STATED THE DEALER REPLACED SEAT AND ELECTRICAL COMPONENTS BUT WILL NOT PROVIDE CONSUMER WITH ANY DOCUMENTATION OR INFORMATION PERTAINING TO THE DEFECT AND REPAIR. UPDATED 09/18/07 *TR

Mileage: 28,000

20060314STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS

DT*: THE CONTACT STATED WHILE DRIVING AT 30 MPH GOING AROUND A CURVE THE STEERING BECAME DIFFICULT AND THEN LOCKED. THE VEHICLE WAS TOWED TO THE DEALERSHIP FOR INSPECTION AND DETERMINED THERE WAS NHTSA RECALL #03V121000 FOR THE STEERING HYDRAULIC POWER ASSIST HOSE, PIPING AND CONNECTIONS. THE HOSE CLAMP ON THE POWER STEERING HOSE WAS REPLACED. UPDATED 5/2/2006 - THE VEHICLE HAD BEEN RECALLED AND REPLACED IN 2003 FOR THE HOSE CLAMPS. *NM CONTACT WAS TOLD BY MERCEDES THAT THIS FAILURE DID NOT INVOLVE THE CLAMP BUT THE HOSE WORE OUT. ALSO, WAS TOLD THAT THE STEERING FAILURE HAD NOTHING TO DO WITH THE MECHANIC WHO HAD SERVICED THE VEHICLE 2 DAYS PRIOR. IT WAS JUST SOMETHING THAT HAPPENED, AND THAT THERE ARE NO PROBLEMS WITH THE CURRENT CLAMP/ HOSE IN THE STEERING COLUMN. WHEN THE CONTACT PICKUP THE VEHICLE FROM DEALER NOTICED A CHARGE FOR REPLACING THE STEERING HOSE CLAMP AND LOWER HOSE. THE CONTACT WAS TOLD IT WAS ONLY A BILLING CODE FOR THE WORK DONE BY THE MECHANIC. THE NEW

Mileage: 24,368

20050513SEATS

- NO PRECURSORS OR APPARENT DAMAGE - DRIVERS SEAT HEATER FAILED RESULTING IN STRONG BURNING SMELL, AND SUPERFICIAL BURN TO LEFT UPPER LEG OF DRIVER

Mileage: 25,000

20050513ELECTRICAL SYSTEM

- NO PRECURSORS OR APPARENT DAMAGE - DRIVERS SEAT HEATER FAILED RESULTING IN STRONG BURNING SMELL, AND SUPERFICIAL BURN TO LEFT UPPER LEG OF DRIVER

Mileage: 25,000

20040408ELECTRICAL SYSTEM

ON THE HIGHWAY DRIVING 65 MY 2003 ML500 MERCEDES - BENZ COMPUTER SHUT DOWN AFTER HITTING A SMALL BUMP. IT WAS VERY DANGEROUS AND WAS SCARED FOR MY LIFE THERE ENGINE TURNED OFF AND WAS LUCKILY ABLE TO STOP AT THE SIDE OF THE ROAD AND START THE CAR AGAIN. THIS HAPPENED A COUPLE OF WEEKS BEFORE BUT IT STOPED FOR JUST A SECOND OR TWO. THIS ISN;T AN LD CAR WITH ABOUT 25K MILES ON IT. FOR A 55 THOUSAND DOLLARS CAR TO DO THAT IS UNACCEPTABLE.*AK

Mileage: 24,300

20040304POWER TRAIN:AUTOMATIC TRANSMISSION

THE TRANSMISSION OF THE SUV "JAMMED" WHILE DRIVING ON THE FREEWAY, AND MY WIFE WHO WAS DRIVING THE VEHICLE ALMOST GOT INTO A ACCIDENT. THE SUV WAS PREVIOUSLY MAKING SUDDEN JUMPS WHILE AUTOMATICALLY SHIFTING THE GEARS. THE PROBLEM WAS REPORTED TO THE DEALER, BUT DEALER DID NOT DIAGNOSE THE TRANSMISSION PROBLEM CORRECTLY. NOW THE VEHICLE IS WITH THE DEALER AND THE SERVICE MANAGER TELLS ME THAT THERE WAS METAL DEBRIS IN THE TRASMISSION WHICH, ACCORDING TO THE SERVICE MANAGER, COULD BE DUE TO FAILURE OF THE CLUTCH.

Mileage: 20,000

20040128EXTERIOR LIGHTING:HEADLIGHTS

HELLO, I HAVE RECENTLY PURCHASED A BRAND NEW MERCEDES ML500 TRUCK FROM MILLENNIUM IN BRIDGEWATER, NJ 908-685-0800. THE PROBLEM I HAVE IS THAT ONE OF THE HEADLIGHTS IS DEFECTIVE AND HAS CONDENSATION BUILD IN IT ALL THE TIMES. WHILE THE DEALER SYMPTHISES WITH ME, THE DEALER REFUSES TO REPLACE IT BECAUSE MERCEDES WOULD NOT PAY FOR IT. MERCEDES SAYS IT IS NOT A PROBLEM. HOW CAN IT NOT BE A PROBLEM WHEN AT NIGHT IS PRESENTS A SAFTY PROBLEM AS IT IS LIKE DRIVING WITH ONE HEAD LIGHT ON, AND THE GLASS ON HEADLIGHT IS COVERED WITH CONDENSATION. SECONDLY, I HAVE YET TO SEE ANOTHER CAR WITH CONDENSATION BUILD IN THE HEADLIGHTS. IT IS A BRAND NEW SUV. *AK

20031030ELECTRICAL SYSTEM

I PURCHASED A NEW 2003 ML 350 DURING THE MEMORIAL DAY SALE FROM OUR LOCAL MERCEDES DEALER IN IOWA CITY, IA. THE SUV SHUTS OFF AUTOMATICALLY. INITIALLY, THE DEALER REPLACED THE BATTERY. THE SUV HAS BEEN INTO THE DEALER THREE ADDITIONAL TIMES FOR THE SAME PROBLEM. EACH TIME, THE DAY AFTER I RECEIVED THE ML350 BACK, THE PROBLEM OCCURS AGAIN. TWO INCIDENTS OCCURRED WHERE THE SUV WOULD NOT START IN MY GARAGE (WHICH PRESENTED NO HAZARD). TWO INCIDENTS OCCURRED WHERE I WAS DRIVING THE VEHICLE. THIS IS AN EXTREME SAFETY HAZARD - PARTICULARLY IF YOU TRAVELING AT A HIGH RATE OF SPEED. THE DATE LISTED BELOW IS THE MOST RECENT INCIDENT. *LA

Mileage: 7,000

20030916CrashENGINE AND ENGINE COOLING:ENGINE

I WAS PULLING INTO A PARKING SPACE (WITH MY 3 SMALL CHILDREN STRAPPED IN THE BACK), WHEN I REALIZED THAT THE CAR WAS NOT STOPPING. I PRESSED THE BRAKE HARDER, THE CAR ACCELERATED, JUMPED THE CEMENT MEDIAN, AND HIT A PARKED CAR. THANK GOD NO ONE WAS INJURED. I AM SICK THINKING WHAT COULD OF HAPPENED. THE CAR IS 6 MONTHS OLD AND HAS BEEN BACK TO THE DEALERSHIP TWICE FOR A PROBLEM I BELIEVE WAS THE BEGINNING OF THIS, I.E., WHEN I WOULD STEP ON THE BRAKE IT WOULD GO TO STALL, BUCK FORWARD AND THEN BE OK. THE DEALERSHIP WAS UNABLE TO FIND IT OR DUPLICATE IT. I HAVE SEEN WHERE OTHER PEOPLE ARE HAVING THIS SAME PROBLEM. ALSO FOR 2003 THE MODEL IS ML 350 - MERCEDES. AGAIN THEY HAVE NOT FOUND A PROBLEM. THEY SENT THE MANUFACTURER OUT TO CHECK THE CAR AND NOTHING. I HAVE A POLICE REPORT THAT STATES THE RESPONDING POLICE OFFICER AND TOW TRUCK DRIVER CONCUR THAT THE BRAKES WERE DOWN TO THE FLOOR BOARD AND NOT ENGAGING.*JB

Mileage: 10,744

Compare 2003MERCEDES-BENZM-CLASS to Similar Vehicles

NHTSA Investigations

Frequently Asked Questions

How many complaints does the 2003 MERCEDES-BENZ M-CLASS have?
The 2003 MERCEDES-BENZ M-CLASS has 12 NHTSA complaints, 1 crashes, 2 fires, 6 injuries, and 0 deaths reported.
What are the most common problems with the 2003 MERCEDES-BENZ M-CLASS?
The most-complained component for the 2003 MERCEDES-BENZ M-CLASS is ELECTRICAL SYSTEM with 4 complaints. Other frequently reported areas include ENGINE AND ENGINE COOLING:ENGINE and EXTERIOR LIGHTING:HEADLIGHTS.
Is the 2003 MERCEDES-BENZ M-CLASS safe to buy?
Review the complaint history, crash and fire reports, safety ratings, and recall status on this page to make an informed decision. No NHTSA crash test rating is available for this model year. Compare with other model years using the links above.
Where does this data come from?
All complaint, recall, and safety rating data is sourced from the National Highway Traffic Safety Administration (NHTSA). Complaints are filed by vehicle owners through NHTSA's Office of Defects Investigation.

Vehicle Safety Guides

Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.