WENT TO PARK THE VEHICLE AND IT SEEM TO SHIFT INTO A LOWER GEAR AN ACCELERATING, CAUSING IT TO LUNGE FORWARD INTO A LIGHT POLE. *TR
1999 Mercedes Benz ML320
Owner reports · Recalls · Investigations
More warning signs than most ML320 years
Owner complaints for the 1999 Mercedes Benz ML320 are substantially higher than the model-year median of 28.
About this comparison →How this year compares
Owner complaints by model year
Compare all ML320 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
72 reports with mileage · 53 unknown
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.
- Engine And Engine Cooling. Review the 35 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Steering. Review the 29 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 19 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
Power Train complaints
19 reportsTL* THE CONTACT OWNS A 1999 MERCEDES BENZ ML320. WHILE PARKED, THE CONTACT ATTEMPTED TO MOVE THE GEAR SHIFTER FROM PARK BUT THE SHIFTER REMAINED STUCK IN PARK. THE FAILURE RECURRED INTERMITTENTLY AND AFTER WAITING A FEW MINUTES, THE CONTACT WOULD BE ABLE TO MOVE THE GEAR SHIFTER. THE VEHICLE WAS TAKEN TO THE DEALER FOR DIAGNOSTI…
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TL* THE CONTACT OWNS A 1999 MERCEDES BENZ ML320. WHILE PARKED, THE CONTACT ATTEMPTED TO MOVE THE GEAR SHIFTER FROM PARK BUT THE SHIFTER REMAINED STUCK IN PARK. THE FAILURE RECURRED INTERMITTENTLY AND AFTER WAITING A FEW MINUTES, THE CONTACT WOULD BE ABLE TO MOVE THE GEAR SHIFTER. THE VEHICLE WAS TAKEN TO THE DEALER FOR DIAGNOSTICS. THE TECHNICIAN WAS UNABLE TO DIAGNOSE THE FAILURE AND THE VEHICLE WAS NOT REPAIRED. THE VIN WAS NOT AVAILABLE. THE APPROXIMATE FAILURE MILEAGE WAS 160,000.
I HAVE 2 COMPLAINTS AGAINST MERCEDES ML320 SUV. 1) WITH IGNITION OFF AND KEY REMOVED, THE TRANSMISSION SHIFTER CAN BE SHIFTED TO NEUTRAL AND THE TRUCK STARTS TO ROLL. IT POSTS EXTREME DANGER TO PASSENGERS, ESPECIALLY, KIDS LEFT IN A PARKED VEHICLE, AS WELL AS PEDESTRIANS IN FRONT OR BEHIND THE VEHICLE, ESPECIALLY THOSE STANDIN…
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I HAVE 2 COMPLAINTS AGAINST MERCEDES ML320 SUV. 1) WITH IGNITION OFF AND KEY REMOVED, THE TRANSMISSION SHIFTER CAN BE SHIFTED TO NEUTRAL AND THE TRUCK STARTS TO ROLL. IT POSTS EXTREME DANGER TO PASSENGERS, ESPECIALLY, KIDS LEFT IN A PARKED VEHICLE, AS WELL AS PEDESTRIANS IN FRONT OR BEHIND THE VEHICLE, ESPECIALLY THOSE STANDING IN BETWEEN THIS VEHICLE AND ANOTHER PARKED VEHICLE ON A SLOPE. 2) THE WELL KNOWN POWER LOCK FAILURE CAUSES THE MANUALLY LOCKED DOORS (INCLUDING CHILD PROOF REAR DOOR LOCKS) TO BE UNLOCKED AUTOMATICALLY WHENEVER THE VEHICLE STARTS IN MOTION FROM FULL STOP. IT IS DUE TO THE AUTO-LOCK FEATURE WHICH ATTEMPTS TO LOCK ALL DOORS WHEN THE VEHICLE STARTS TO MOVE FROM FULL STOP (E.G STOPPING FOR RED LIGHT). HOWEVER, DUE TO POWER LOCK FAILURE, IT CANNOT LOCK ALL THE DOORS AFTER 4-5 TIMES AND EVENTUALLY UNLOCKS ALL DOORS. THIS LEFT CHILDREN IN THE REAR IN DANGER OF OPENING THE DOORS WHILE THE VEHICLE IS IN MOTION. THIS PROBLEM HAPPENED TO ME TWICE; ONE AT 9700 MILES IN 2001 AND AT 70,000 MILES IN 2007. I HAD WRITTEN A LETTER TO MERCEDES BENZ USA TO COMPLAINT ABOUT THE POWER LOCK AND THEY JUST DENIED THAT IT IS A DEFECT. *TR
REFERENCE: VEHICLE COMPLAINT - 47046 IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS PART OF A RECALL CONCERNING A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOSING ALL HYDRAULIC FLUID. …
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REFERENCE: VEHICLE COMPLAINT - 47046 IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS PART OF A RECALL CONCERNING A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOSING ALL HYDRAULIC FLUID. WE LOST THE POWER STEERING AND HAD EXTREME DIFFICULTY STEERING THE VEHICLE. THE SAME PROBLEM HAS OCCURRED WITH A FAMILY MEMBER'S ML-320. IN ADDITION, THE TRANSMISSION HAS FROZEN FOUR TIMES IN FIRST GEAR. THE MERCEDES DEALER WAS UNABLE TO LOCATE THE PROBLEM. THE VEHICLE WAS TOWED TO THE DEALER, AND THEY REPLACED THE HOSE; HOWEVER, WE HAVE NOT RETRIEVED THE VEHICLE FROM THE DEALER BECAUSE WE ARE FEARFUL ABOUT DRIVING THE VEHICLE DUE TO THESE RECURRING PROBLEMS. *JB
IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS A PART OF A RECALL FOR A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOOSING ALL HYDRAULIC FLUID. WE LOST THE POWER STEERING AND HAD EXTREM…
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IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS A PART OF A RECALL FOR A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOOSING ALL HYDRAULIC FLUID. WE LOST THE POWER STEERING AND HAD EXTREME DIFFICULTY STEERING THE VEHICLE. THE SAME PROBLEM HAS OCCURRED WITH A FAMILY MEMBER'S ML-320. IN ADDITION, THE TRANSMISSION HAS FROZEN FOUR TIMES IN FIRST GEAR. THE MERCEDES DEALER WAS UNABLE TO LOCATE THE PROBLEM. THE VEHICLE WAS TOWED TO THE DEALER AND THEY REPLACED THE HOSE; HOWEVER, WE HAVE NOT RETRIEVED THE VEHICLE FROM THE DEALER BECAUSE WE ARE FEARFUL ABOUT DRIVING THE VEHICLE DUE TO THESE RECURRING PROBLEMS. *TR
I HAVE A MERCEDES ML 320. IT IS A 1999 MODEL WITH LESS THAN 100,000 MILES. THE TRANSMISSION SLIPS OUT OF GEAR WHEN DRIVING. SOMETIMES THE TRANSMISSION LOCKS IN GEAR..SO WHEN PULLING OUT IN AN INTERSECTION AND ONE THINKS THE TRANSMISSION WAS IN LOW FOR POWER, IT IS LOCKED IN HIGH AND THE CAR COULD NOT ACCELERATE QUICKLY ENOUGH…
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I HAVE A MERCEDES ML 320. IT IS A 1999 MODEL WITH LESS THAN 100,000 MILES. THE TRANSMISSION SLIPS OUT OF GEAR WHEN DRIVING. SOMETIMES THE TRANSMISSION LOCKS IN GEAR..SO WHEN PULLING OUT IN AN INTERSECTION AND ONE THINKS THE TRANSMISSION WAS IN LOW FOR POWER, IT IS LOCKED IN HIGH AND THE CAR COULD NOT ACCELERATE QUICKLY ENOUGH TO AVOID A POTENTIAL COLLISION WITH ONCOMING VEHICLES. ALSO, WHEN DRIVING, THE TRANSMISSION MIGHT SLIP OUT OF GEAR AT AN INOPPORTUNE TIME AS WELL. ONE HAS TO STOP THE VEHICLE AND TURN OFF THE IGNITION AND THEN RESTART WHICH RESETS THE TRANSMISSION. I HAVE SPOKEN TO MANY MECHANICS AND THEY ALL SAY THAT MERCEDES HAS KNOWN ABOUT THE PROBLEM AND REFUSES TO RECALL. I AM HAVING THE TRANSMISSION REBUILT BUT I BELIEVE THERE ARE MANY OTHER PEOPLE THAT HAVE EXPERIENCED THE PROBLEM. A RECALL SHOULD BE ORDERED ON THE 1999 THROUGH 2001 MODELS BEFORE SOMEONE DOES GET KILLED. WE HAVE EXPERIENCED THIS PROBLEM MANY TIMES IN THE PAST 2 YEARS AND WE'VE HAD THE MERCEDES DEALER TRY TO RESOLVE THE PROBLEM WITHOUT RESORTING TO A NEW TRANSMISSION. WE ALSO HAD IT TO VARIOUS INDEPENDENT MECHANICS THAT ALSO FAILED IN THEIR EFFORTS.*AK
CONSUMER WAS ABLE TO REMOVE THE KEY FROM IGNITION WITHOUT THE VEHICLE BEING IN PARK. *AK THE CONSUMER STATED THAT SHE COULD SHIFT THE GEAR LEVER TO ALL GEARS WHEN THE KEY WAS NOT IN THE IGNITION AND ENGINE IN AN OFF POSITION. THE VEHICLE ROLLED DOWN THE HILL AND RAN OVER A MAILBOX DAMAGING THE VEHICLE AND BACK WHILE THE GEAR…
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CONSUMER WAS ABLE TO REMOVE THE KEY FROM IGNITION WITHOUT THE VEHICLE BEING IN PARK. *AK THE CONSUMER STATED THAT SHE COULD SHIFT THE GEAR LEVER TO ALL GEARS WHEN THE KEY WAS NOT IN THE IGNITION AND ENGINE IN AN OFF POSITION. THE VEHICLE ROLLED DOWN THE HILL AND RAN OVER A MAILBOX DAMAGING THE VEHICLE AND BACK WHILE THE GEAR LEVER WAS STILL IN PARK. THE REAR SEAT BELTS DOES NOT RETRACT AND HAD TO BE MANUALLY PUSHED BACK INTO THE MECHANISM. *TC
UPON PULLING ONTO THE INTERSTATE VEHICLE JERKED THEN STALLED. CONSUMER HAD THE VEHICLE TOWED TO THE DEALERSHIP FOR INSPECTION, AND MECHANIC DETERMINED THAT TRANSMISSION FAILED. *AK
TRAVELING AT HIGHWAY SPEEDS OF 70 MPH UP A STEEP GRADE ON CALIFORNIA INTERSTATE 5 ON THE SECTION OF THE HIGHWAY KNOWN AS "THE GRAPE VINE" ELEVATION OF 3000-4000 FEET, HEADED NORTH KEEPING PACE WITH HEAVY TRAFFIC IN THE FAST LANE (FAR LEFT HAND SIDE OF THE FREEWAY HIGHWAY ), IN THE AFTERNOON OF 2/16/04 AT 2 PM WITH CRUISE CONTROL…
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TRAVELING AT HIGHWAY SPEEDS OF 70 MPH UP A STEEP GRADE ON CALIFORNIA INTERSTATE 5 ON THE SECTION OF THE HIGHWAY KNOWN AS "THE GRAPE VINE" ELEVATION OF 3000-4000 FEET, HEADED NORTH KEEPING PACE WITH HEAVY TRAFFIC IN THE FAST LANE (FAR LEFT HAND SIDE OF THE FREEWAY HIGHWAY ), IN THE AFTERNOON OF 2/16/04 AT 2 PM WITH CRUISE CONTROL ON THE CAR ( 1999 MERZ, CLASS HD,, BODY TYPE UT [XXX]) AUTOMATICALLY SHIFTED TO A LOWER GEAR SENDING THE RPMS FROM 2500 TO 3000-4000, THIS NORMAL AUTOMATIC ACTION CAUSED THE CAR TO STOP ALL FORWARD MOTION REDUCING BOTH CAR SPEED AND RPMS TO ZERO IN THE FAST LANE, THE IMPACT A "FULL ENGINE SHUT DOWN" A HIGHLY DANGEROUS ACTION IN FAST MOVING TRAFFIC WITH A SHORT HAZARDOUS SIGNALING NOTICE. THE CAR IN JULY OF 2003 PERFORMED IN THE SAME MANNER IN THE SAME SECTION OF "THE GRAPE VINE" HEADED SOUTH IN THE FAST LANE WITH A DIFFERENT DRIVER, NOT USING CRUISE CONTROL THE VEHICLE STOPPED ALL FORWARD MOTION. SHORTLY ARRIVING IN PALM SPRINGS CALIFORNIA ON THE SAME DAY, THE CAR AGAIN PERFORMED IN THE SAME MALFUNCTION. THE CAR WAS TAKEN TO THE PALM SPRINGS MERCEDES DEALERSHIP. THE PROBLEM IDENTIFIED AND PRESUMABLY RESOLVED. THE PROBLEM IS NOT RESOLVED AS STATED FOR THE PURPOSE OF THIS LETTER. IT HAS OCCURRED FOR THE THIRD TIME. THIS IS A CRITICAL LIFE THREATENING MALFUNCTION THAT DEMANDS IMMEDIATE RECTIFICATION. *JB UPDATED 07/26/2012 *JS INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
THE CONSUMER NOTICED ABOUT THREE DAYS AGO THAT WHEN THE VEHICLE IS OFF AND THE KEY IS OUT OF THE IGNITION, THE GEAR SHIFTER WOULD SHIFT TO OTHER GEARS. PLEASE PROVIDE DETAILS. *PH
Official recalls
0No 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
2PE03058 · Engine Crankshaft Pulley Failure
Opened Dec 17, 2003 · Closed Apr 22, 2004
Status: closed (inferred from source dates) · Engine And Engine Cooling:engine:gasoline:belts And Associated Pulleys
THE OFFICE OF DEFECTS INVESTIGATION (ODI) OPENED THIS PRELIMINARY EVALUATION TO INVESTIGATE ALLEGATIONS OF ENGINE CRANKSHAFT PULLEY HARMONIC BALANCER FAILURE THAT COULD RESULT IN LOSS OF POWER-STEERING ASSIST.ODI HAS RECEIVED A TOTAL OF 546 NON-DUPLICATIVE REPORTS THAT ALLEGE ENGINE CRANKSHAFT PULLEY HARMONIC BALANCER FAILURE ON ALL MERCEDES-BENZ VEHICLES USING THE SUBJECT COMPONENT.THE SUBJECT COMPONENT FAILURES ARE PROGRESSIVE IN NATURE AND ONLY A SMALL PERCENTAGE OF THE COMPLAINTS AND WARRANT CLAIMS INVOLVED A FAILURE THAT HAD PROGRESSED FAR ENOUGH TO EFFECT POWER STEERING PERFORMANCE (6 OF 55 ODI COMPLAINTS REFERENCE INCREASED STEERING EFFORT).THERE HAVE BEEN NO CRASHES OR INJURIES RELATED TO THE ALLEGED DEFECT.A SAFETY-RELATED DEFECT HAS NOT BEEN IDENTIFIED AT THIS TIME AND FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.SEE SUMMARY REPORT ATTACHED FOR FURTHER DETAIL.
PE03006 · Power Steering Hose Assembly Leakage
Opened Feb 13, 2003 · Closed Apr 4, 2003
Status: closed (inferred from source dates) · Steering:hydraulic Power Assist:hose, Piping, And Connections; Steering:hydraulic Power Assist:power Steering Fluid
THE HOSE CLAMP USED TO SECURE THE POWER STEERING FLUID COOLING HOSE TO THE STEERING FLUID COOLER MAY NOT PROVIDE SUFFICIENT CLAMPING FORCE FOR THE CONNECTION.THE LOSS OF POWER STEERING FLUID MAY RESULT IN GRADUAL REDUCTION IN POWER STEERING ASSIST (I.E., INCREASED STEERING EFFORT) OVER TIME, WITH POTENTIAL DAMAGE TO THE POWER STEERING PUMP. THERE HAVE ALSO BEEN A FEW INCIDENTS OF HOSE SEPARATION FROM THE FITTING, THAT HAVE RESULTED IN MORE RAPID REDUCTIONS OF POWER STEERING.TESTING CONDUCTED BY MERCEDES-BENZ INDICATES THAT THE LEAKED FLUID IS NOT LIKELY TO BE EXPOSED TO HOT ENGINE COMPONENTS.THERE ARE NO KNOWN ALLEGATIONS THAT THE DEFECT CONDITION HAS CAUSED A VEHICLE FIRE. MERCEDES-BENZ WILL CONDUCT A VOLUNTARY RECALL CAMPAIGN FOR THE SUBJECT M-CLASS VEHICLES.MERCEDES-BENZ WILL INSTALL A NEW HOSE CLAMP ON THE POWER STEERING HOSE TO THE POWER STEERING COOLER OF THE SUBJECT VEHICLES.DURING CLAMP REPLACEMENT, THE POWER STEERING COOLING HOSE WILL BE INSPECTED AND REPLACED AS NECESSARY.
Additional source detail variants (2)
Steering:hydraulic Power Assist:hose, Piping, And Connections
THE HOSE CLAMP USED TO SECURE THE POWER STEERING FLUID COOLING HOSE TO THE STEERING FLUID COOLER MAY NOT PROVIDE SUFFICIENT CLAMPING FORCE FOR THE CONNECTION.THE LOSS OF POWER STEERING FLUID MAY RESULT IN GRADUAL REDUCTION IN POWER STEERING ASSIST (I.E., INCREASED STEERING EFFORT) OVER TIME, WITH POTENTIAL DAMAGE TO THE POWER STEERING PUMP. THERE HAVE ALSO BEEN A FEW INCIDENTS OF HOSE SEPARATION FROM THE FITTING, THAT HAVE RESULTED IN MORE RAPID REDUCTIONS OF POWER STEERING.TESTING CONDUCTED BY MERCEDES-BENZ INDICATES THAT THE LEAKED FLUID IS NOT LIKELY TO BE EXPOSED TO HOT ENGINE COMPONENTS.THERE ARE NO KNOWN ALLEGATIONS THAT THE DEFECT CONDITION HAS CAUSED A VEHICLE FIRE. MERCEDES-BENZ WILL CONDUCT A VOLUNTARY RECALL CAMPAIGN FOR THE SUBJECT M-CLASS VEHICLES.MERCEDES-BENZ WILL INSTALL A NEW HOSE CLAMP ON THE POWER STEERING HOSE TO THE POWER STEERING COOLER OF THE SUBJECT VEHICLES.DURING CLAMP REPLACEMENT, THE POWER STEERING COOLING HOSE WILL BE INSPECTED AND REPLACED AS NECESSARY.
Steering:hydraulic Power Assist:power Steering Fluid
THE HOSE CLAMP USED TO SECURE THE POWER STEERING FLUID COOLING HOSE TO THE STEERING FLUID COOLER MAY NOT PROVIDE SUFFICIENT CLAMPING FORCE FOR THE CONNECTION.THE LOSS OF POWER STEERING FLUID MAY RESULT IN GRADUAL REDUCTION IN POWER STEERING ASSIST (I.E., INCREASED STEERING EFFORT) OVER TIME, WITH POTENTIAL DAMAGE TO THE POWER STEERING PUMP. THERE HAVE ALSO BEEN A FEW INCIDENTS OF HOSE SEPARATION FROM THE FITTING, THAT HAVE RESULTED IN MORE RAPID REDUCTIONS OF POWER STEERING.TESTING CONDUCTED BY MERCEDES-BENZ INDICATES THAT THE LEAKED FLUID IS NOT LIKELY TO BE EXPOSED TO HOT ENGINE COMPONENTS.THERE ARE NO KNOWN ALLEGATIONS THAT THE DEFECT CONDITION HAS CAUSED A VEHICLE FIRE. MERCEDES-BENZ WILL CONDUCT A VOLUNTARY RECALL CAMPAIGN FOR THE SUBJECT M-CLASS VEHICLES.MERCEDES-BENZ WILL INSTALL A NEW HOSE CLAMP ON THE POWER STEERING HOSE TO THE POWER STEERING COOLER OF THE SUBJECT VEHICLES.DURING CLAMP REPLACEMENT, THE POWER STEERING COOLING HOSE WILL BE INSPECTED AND REPLACED AS NECESSARY.
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