Total Complaints
19 filings
MERCEDES-BENZ ML500 · model year
19 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2003MERCEDES-BENZML500 carries 19 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 2 fires, 1 injury, 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 ML500 is engine with 5 filings, followed by steering (3) and electrical system (3). 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 15 investigation files overlapping the 2003 ML500. 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.
Total Complaints
19 filings
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
At or below the fleet median complaint volume.
| Component | Count |
|---|---|
| ENGINE | 5 |
| STEERING | 3 |
| ELECTRICAL SYSTEM | 3 |
| SEATS | 2 |
| SERVICE BRAKES | 2 |
| SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP | 1 |
| TIRES | 1 |
| SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER | 1 |
| FUEL SYSTEM, GASOLINE | 1 |
TL* THE CONTACT OWNS A 2003 MERCEDES-BENZ ML500. THE CONTACT STATED THAT THE ABS INDICATOR KEPT RANDOMLY ILLUMINATING AND THE BRAKE PEDAL TRAVELED TO THE FLOORBOARD WHEN IT WAS DEPRESSED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC, BUT WAS NOT DIAGNOSED OR REPAIRED. THE VEHICLE REMAINED PARKED FOR OVER A YEAR DUE TO THE RISK OF A POTENTIAL CRASH. THE DEALER AND MANUFACTURER WERE NOT CONTACTED. THE FAILURE MILEAGE WAS NOT AVAILABLE.
ENGINE KEEPS GETTING OVER-HEATED EVEN AFTER A NEW ENGINE FAN HAS BEEN REPLACED. HOWEVER, AFTER ITS REPLACEMENT I TOOK IT TO TWO MERCEDES DEALERSHIP TO RE-INSPECT AND MAKE ADJUSTMENT TO THEIR INSTALLMENT OF THE FAN BUT IT KEEPS GETTING OVERHEATED. I ALSO HAD A NEW WATER COOLANT TANK INSTALLED BUT IT IS ALSO LEAKING OUT THE COOLANT AND SHOWING THE WARNING LIGHT. THESE EVENTS HAPPEN AFTER I TOP UP THE COOLANT TANK AND DRIVE AROUND 50 MILES, THEN THE OVERHEATING STARTS AND THE TANK STARTS BECOMING EMPTY.
LOSS OF POWER STEERING DRIVING ON THE FREEWAY DUE TO SUDDEN BREAK OF IDLER ARM PULLEY AND SUBSEQUENT SHREDDING OF BELT. PROBLEM IS THE PULLEY IS MADE OF PLASTIC AND CRACKED IN TWO, LEAVING 1/2 THE PULLEY AND SHREDDING THE BELT. THIS OCCURRED AT DRIVING SPEED OF 50 MPH AND MILEAGE AROUND 169,650 ON 2003 ML500. THIS WAS VERY DANGEROUS. I WAS ABLE TO PULL OFF THE FREEWAY AS I WAS DRIVING IN THE LANE NEAREST FREEWAY EXITS. ALMOST IMPOSSIBLE BUT ABLE TO STEER INTO A PARKING LOT. LUCKY IT WAS 'RUSH' HOUR AND TRAFFIC WAS SLOW ON SURFACE STREETS. INCREDIBLE SAFETY ISSUE DUE TO DIFFICULTY TO STEER WITHOUT POWER STEERING. CAR IS REGULARLY MAINTAINED BY GERMAN MECHANIC FAMILIAR WITH REPAIR OF MB ENGINES IN GERMANY.
Mileage: 169,650
LOSS OF POWER STEERING DRIVING ON THE FREEWAY DUE TO SUDDEN BREAK OF IDLER ARM PULLEY AND SUBSEQUENT SHREDDING OF BELT. PROBLEM IS THE PULLEY IS MADE OF PLASTIC AND CRACKED IN TWO, LEAVING 1/2 THE PULLEY AND SHREDDING THE BELT. THIS OCCURRED AT DRIVING SPEED OF 50 MPH AND MILEAGE AROUND 169,650 ON 2003 ML500. THIS WAS VERY DANGEROUS. I WAS ABLE TO PULL OFF THE FREEWAY AS I WAS DRIVING IN THE LANE NEAREST FREEWAY EXITS. ALMOST IMPOSSIBLE BUT ABLE TO STEER INTO A PARKING LOT. LUCKY IT WAS 'RUSH' HOUR AND TRAFFIC WAS SLOW ON SURFACE STREETS. INCREDIBLE SAFETY ISSUE DUE TO DIFFICULTY TO STEER WITHOUT POWER STEERING. CAR IS REGULARLY MAINTAINED BY GERMAN MECHANIC FAMILIAR WITH REPAIR OF MB ENGINES IN GERMANY.
Mileage: 169,650
TAKATA RECALL. POWER STEERING BRAKE ISSUE, POWER STEERING HOSE BECAME DETACHED DURING VEHICLE OPERATION, COULD NOT STEER VEHICLE. TRANSMISSION AND RADIO DRAIN, CAR CUT OFF ON ME DURING DRIVING.
Mileage: 150,000
TAKATA RECALL. POWER STEERING BRAKE ISSUE, POWER STEERING HOSE BECAME DETACHED DURING VEHICLE OPERATION, COULD NOT STEER VEHICLE. TRANSMISSION AND RADIO DRAIN, CAR CUT OFF ON ME DURING DRIVING.
Mileage: 150,000
TAKATA RECALL. POWER STEERING BRAKE ISSUE, POWER STEERING HOSE BECAME DETACHED DURING VEHICLE OPERATION, COULD NOT STEER VEHICLE. TRANSMISSION AND RADIO DRAIN, CAR CUT OFF ON ME DURING DRIVING.
Mileage: 150,000
TL* THE CONTACT OWNS A 2003 MERCEDES BENZ ML500. WHILE DRIVING APPROXIMATELY 40 MPH, THE BRAKE PEDAL WAS DEPRESSED AND FAILED TO RESPOND INTERMITTENTLY. THE ABS WARNING LIGHT ILLUMINATED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 81,000...UPDATED 08/06/15 *BF THE CONSUMER STATED TWO LINES FROM THE RESERVOIR TO THE HYDRAULIC PRESSURE REGULATOR FAILED. FURTHER INVESTIGATION REVEALED ALL THE BRAKE LINES HAD SEVERE PITTING AND CORROSION , AS WELL AS THE FUEL LINES. UPDATED 08/13/15*JB UPDATED 8/28/15*CN UPDATED 09/01/15*LJ UPDATED 09/08/15*JB UPDATED 10/01/15*LJ UPDATED 10/31/2017*CN
Mileage: 81,000
TL* THE CONTACT OWNS A 2003 MERCEDES BENZ ML500. WHILE DRIVING APPROXIMATELY 40 MPH, THE BRAKE PEDAL WAS DEPRESSED AND FAILED TO RESPOND INTERMITTENTLY. THE ABS WARNING LIGHT ILLUMINATED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 81,000...UPDATED 08/06/15 *BF THE CONSUMER STATED TWO LINES FROM THE RESERVOIR TO THE HYDRAULIC PRESSURE REGULATOR FAILED. FURTHER INVESTIGATION REVEALED ALL THE BRAKE LINES HAD SEVERE PITTING AND CORROSION , AS WELL AS THE FUEL LINES. UPDATED 08/13/15*JB UPDATED 8/28/15*CN UPDATED 09/01/15*LJ UPDATED 09/08/15*JB UPDATED 10/01/15*LJ UPDATED 10/31/2017*CN
Mileage: 81,000
DRIVING 45MPH ON HIGHWAY, CAR SHUTS OFF COMPLETELY. TOWED TO CLOSEST GAS STATION, WHO PUT A COMPUTER ON IT TO FIND OUT IT WAS THE CRANK SHAFT SENSOR. AFTER COMPLETELY COOLING IT WILL START AGAIN, BUT IN LESS THAN 10 MIN IT CUTS OFF. *TR
Mileage: 111,000
DRIVING 45MPH ON HIGHWAY, CAR SHUTS OFF COMPLETELY. TOWED TO CLOSEST GAS STATION, WHO PUT A COMPUTER ON IT TO FIND OUT IT WAS THE CRANK SHAFT SENSOR. AFTER COMPLETELY COOLING IT WILL START AGAIN, BUT IN LESS THAN 10 MIN IT CUTS OFF. *TR
Mileage: 111,000
LAST TIME I USED THE HEATED SEATS, TURNED THEM ON THE WAR I ALWAYS HAVE, BUT DRIVING DOWN THE ROAD MY LEG FELT LIKE IT WAS ON FIRE. ONE SPOT IN MY SEAT BECAME EXTREMELY HOT AND WAS SMOKING. IMMEDIATELY I TURNED THE SEATS OFF AND HAVE NEVER USED THEM AGAIN. CALLED DEALER TO ASK IF THERE WAS A RECALL, BUT NO. *TR
Mileage: 98,000
TL* THE CONTACT OWNS A 2003 MERCEDES-BENZ ML500. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 25 MPH, SMOKE EMITTED FROM THE DRIVER'S SEAT. THE VEHICLE WAS TAKEN TO THE DEALER BUT WAS NEITHER DIAGNOSED NOR REPAIRED. THE MANUFACTURER WAS CONTACTED. THE FAILURE MILEAGE WAS 133,000. THE VIN WAS UNAVAILABLE.
Mileage: 133,000
NOTES TAKEN ON PHONE BY BOWMAN, ODI, NHTSA: VEHICLE SHUTS OFF AFTER IMPACT WITH IRREGULAR ROAD SURFACES CONDITION SUCH AS POTHOLE, TRANSVERSING A CHANGE ROAD GRADES / SURFACES SUCH AS SPEED BUMPS, ETAL. VEHICLE CAN BE IMMEDIATELY RESTARTED AFTER SHUT-OFF. ONE INCIDENT ALLEGEDLY OCCURRED WHEN ATTEMPTING TO MERGING ONTO INTERSTATE.
TL* THE CONTACT OWNS A 2003 MERCEDES BENZ ML 500. WHILE DRIVING APPROXIMATELY 35 MPH, THE CONTACT SMELLED A BURNING ODOR AS HIS LEFT PANT LEG CAUGHT ON FIRE. THE CONTACT SUSTAINED A SMALL BURN TO THE LEG. THE CONTACT STOPPED THE VEHICLE AND NOTICED SPARKS AND A SMALL FLAME COMING THROUGH A SMALL HOLE ON THE FRONT PASSENGER'S SEAT. THE CONTACT WAS ABLE TO EXTINGUISH THE FIRE WITH WATER AND WAS TREATED FOR THE SMALL BURN. THE VEHICLE WAS NOT TAKEN TO THE DEALER FOR DIAGNOSTICS OR REPAIRS. THE APPROXIMATE FAILURE MILEAGE WAS 97,000.
Mileage: 97,000
I PAID MY DEALER FOR A REPAIR OF A COMPONENT THAT WAS COVERED UNDER A RECALL. HOW DO I GET A REFUND OR CREDIT FOR THE EXPENSE. I HAVE ML 500 MERCEDES BENZ 2003. MY POWER STEERING PUMP FAILED AND WAS REPLACED AT THE WHITE PLAINS N.Y. DEALERSHIP. *TR
Mileage: 83,317
2003 MERCEDES BENZ 500 - HEATED SEAT BURNT UP - SMALL HOLE IN SEAT - IT WAS VERY, VERY HOT. 8JB
2003 MERCEDES BENZ ML500 ABS LIGHT ILLUMINATED ON THE DASHBOARD AND THE VEHICLE WAS TAKEN TO THE DEALER. THE DEALER NOTIFIED THE CONSUMER THAT THE BRAKES AND TIRES NEEDED TO BE CHANGED.*MR *NM
2003 MERCEDES BENZ ML500 ABS LIGHT ILLUMINATED ON THE DASHBOARD AND THE VEHICLE WAS TAKEN TO THE DEALER. THE DEALER NOTIFIED THE CONSUMER THAT THE BRAKES AND TIRES NEEDED TO BE CHANGED.*MR *NM
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.
Read our methodology — how this data is sourced, computed, and verified.