NHTSA owner reports · September 18, 2026 snapshot.
Engine And Engine Cooling complaints
27 reportsClear category filterMileage unknown · May 30, 2006
Engine And Engine Cooling
MY MERCEDES YEAR MODEL 2000 ML320 ENGINE STALLS WHILE DRIVING; MOST OFTEN IT COMES AS A SURPRISE WHEN I AM CRUISING AT FREEWAY SPEEDS AND SLIGHTLY BACK OFF ON THE THROTTLE. THE ENGINE TOTALLY SHUTS DOWN AND WILL RESTART AFTER WAITING A FEW MINUTES. IT DOES NOT SEEM LIKE A FUEL PUMP PROBLEM BECAUSE THE CAR WILL RUN FINE FOR SEV…
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MY MERCEDES YEAR MODEL 2000 ML320 ENGINE STALLS WHILE DRIVING; MOST OFTEN IT COMES AS A SURPRISE WHEN I AM CRUISING AT FREEWAY SPEEDS AND SLIGHTLY BACK OFF ON THE THROTTLE. THE ENGINE TOTALLY SHUTS DOWN AND WILL RESTART AFTER WAITING A FEW MINUTES. IT DOES NOT SEEM LIKE A FUEL PUMP PROBLEM BECAUSE THE CAR WILL RUN FINE FOR SEVERAL MONTHS AFTERWARD WITHOUT SHUTTING DOWN. *JB
NHTSA ODI #10158524
Mileage unknown · May 5, 2006
Engine And Engine Cooling
CAUSED BY A RE-CALL CATALYTIC CONVERTERS HAVE BEEN ON ORDER SINCE OCTOBER 17, 2005. MY VEHICLE IS HAS NOT BEEN LEGALLY DRIVABLE FOR NOW TWO WEEKS. THE ONE OF THE CATS IS TOTALLY OPEN CAUSING UN-MUFFLED EXHAUSTION. AFTER ATTEMPTS FROM BOTH THE DEALER AND THE IMPORTER, MERCEDES BENZ USA TO BLAME THE OTHER PART OR THEIR SUPPLIER …
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CAUSED BY A RE-CALL CATALYTIC CONVERTERS HAVE BEEN ON ORDER SINCE OCTOBER 17, 2005. MY VEHICLE IS HAS NOT BEEN LEGALLY DRIVABLE FOR NOW TWO WEEKS. THE ONE OF THE CATS IS TOTALLY OPEN CAUSING UN-MUFFLED EXHAUSTION. AFTER ATTEMPTS FROM BOTH THE DEALER AND THE IMPORTER, MERCEDES BENZ USA TO BLAME THE OTHER PART OR THEIR SUPPLIER AND AFTER SEVERAL PROMISES, I HOPE THIS COMPLAINT WILL HAVE AN IMPACT. I NEED THE USE OF THE VEHICLE. *JB
NHTSA ODI #10156879
79,000 miles · Oct 19, 2005
Engine And Engine Cooling
THIS VEHICLE IS UNDER A FEDERAL RECALL FOR THE CATALYTIC CONVERTER. ACCORDING TO A SERVICE TECHNICIAN, THIS PART IS ON BACK ORDER AND THE DEALER AND MANUFACTURER HAVE BEEN OUT OF STOCK OF THE PART FOR MORE THAN A MONTH. NO ONE CAN SEEM TO GIVE ME AND OTHER OWNERS A DELIVERY DATE ON THE PART. MEANWHILE, I AM DRIVING A VEHICLE …
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THIS VEHICLE IS UNDER A FEDERAL RECALL FOR THE CATALYTIC CONVERTER. ACCORDING TO A SERVICE TECHNICIAN, THIS PART IS ON BACK ORDER AND THE DEALER AND MANUFACTURER HAVE BEEN OUT OF STOCK OF THE PART FOR MORE THAN A MONTH. NO ONE CAN SEEM TO GIVE ME AND OTHER OWNERS A DELIVERY DATE ON THE PART. MEANWHILE, I AM DRIVING A VEHICLE THAT SOUNDS LIKE A HARLEY DAVIDSON MOTORCYCLE AND LIKE IT IS ABOUT TO FALL APART! I HAVE BEEN EXPERIENCING THIS PROBLEM FOR MORE THAN A MONTH AND IT GETS WORSE EVERY WEEK THAT I CONTINUE TO DRIVE IT. I CANNOT AFFORD TO PARK MY VEHICLE AT THE DEALER AS OTHER OWNERS OF ML320S HAVE DONE. HOW CAN A FEDERAL RECALL BE ISSUED AND THE DEALER/MANUFACTURER NOT BE PREPARED? *JB
NHTSA ODI #10140254
47,615 miles · Oct 18, 2005
Engine And Engine CoolingInjury
DT: THERE IS A CRACK IN THE CATALYTIC CONVERTER. IT WAS LEAKING CARBON MONOXIDE. WHEN DRIVING WITH THE WINDOWS CLOSED THE CONSUMER WAS GETTING CARBON MONOXIDE POISONING. THE PROBLEM FIRST STARTED IN JUNE OF 2005. THE CRACK OCCURRED SOMETIME BEFORE THIS. THERE WAS A RATTLING NOISE COMING FROM THE VEHICLE ON SEPTEMBER 12, 2…
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DT: THERE IS A CRACK IN THE CATALYTIC CONVERTER. IT WAS LEAKING CARBON MONOXIDE. WHEN DRIVING WITH THE WINDOWS CLOSED THE CONSUMER WAS GETTING CARBON MONOXIDE POISONING. THE PROBLEM FIRST STARTED IN JUNE OF 2005. THE CRACK OCCURRED SOMETIME BEFORE THIS. THERE WAS A RATTLING NOISE COMING FROM THE VEHICLE ON SEPTEMBER 12, 2005, AND ON SEPTEMBER 15, 2005 THE MECHANIC DISCOVERED A LEAK IN THE RIGHT ONE. BOTH CATALYTIC CONVERTERS CRACKED. THE CONSUMER FOUND THAT THERE HAS BEEN A PROBLEM WITH THIS TYPE OF VEHICLE CONCERNING CATALYTIC CONVERTERS. THE CONSUMER WAS CONCERNED THAT SHE WAS NOT MADE AWARE OF THIS ISSUE. *AK *JB THE CONSUMER EXPERIENCED NAUSEA, DIZZINESS AND SLEEPINESS WHILE DRIVING THE VEHICLE IN JULY, AUGUST AND SEPT 2005. AFTER THE CATALYTIC CONVERTER WAS REPLACED ALL OF THE CONSUMER'S SYMPTOMS DISAPPEARED. A CARBON MONOXIDE DETECTOR WAS INSTALLED IN THE VEHICLE ON 9/15/05. *NM
NHTSA ODI #10137613
61,000 miles · Oct 13, 2005
Engine And Engine Cooling
DT: THE CHECK ENGINE LIGHT HAS BEEN STAYING ON SINCE PURCHASE OF VEHICLE ON MARCH 20, 2004. THE VEHICLE STALLED INTERMITTENTLY SINCE MARCH OF 2005. IT HAPPENED WHEN TRYING TO START THE VEHICLE FROM A COLD START. THE CONTACT STATED THAT HE WILL HAVE TO LEAVE IT RUNNING FOR FIVE TO TEN MINUTES BEFORE IT WILL START. ALSO, …
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DT: THE CHECK ENGINE LIGHT HAS BEEN STAYING ON SINCE PURCHASE OF VEHICLE ON MARCH 20, 2004. THE VEHICLE STALLED INTERMITTENTLY SINCE MARCH OF 2005. IT HAPPENED WHEN TRYING TO START THE VEHICLE FROM A COLD START. THE CONTACT STATED THAT HE WILL HAVE TO LEAVE IT RUNNING FOR FIVE TO TEN MINUTES BEFORE IT WILL START. ALSO, IT WILL STALL WHEN TRYING TO ACCELERATE. HAD A DIAGNOSTICS TEST RUN ON THE VEHICLE AND IT SHOWED A PROBLEM WITH THE MASS OXYGEN SENSORS, MASS AIR FLOW SENSORS, AND SOMETHING ELSE THAT HE WAS NOT SURE OFF. THEY REPLACED THE MASS OXYGEN SENSORS. THIS HELPED THE PROBLEM A LITTLE, BUT, THE PROBLEM RECURRED. . ALSO, THERE WAS A PROBLEM WITH THE WINDOW SWITCH CONSOLE. IT STARTED IN FEBRUARY 2005, AND HAD IT REPLACED. THE CATALYTIC CONVERTER WELD COMPLETELY SEPARATED. THE PROBLEM STARTED IN DECEMBER 2004. COMPLETE SEPARATION HAPPENED IN APRIL OF 2005. THE CONTACT HAD THEM WELDED BACK TOGETHER. *AK
NHTSA ODI #10139565
31,000 miles · Mar 2, 2005
Air BagsEngine And Engine CoolingPower Train
THE CONSUMER'S MERCEDES BENZ M L 320 SLOWED DOWN ON ITS OWN. THE CONSUMER PULLED OVER PUT THE CAR IN PARK AND RESTARTED IT. *BF AFTER THIS INCIDENT THE CONSUMER PARKED IN A MALL PARKING LOT. WHEN SHE RETURNED TO THE VEHICLE THE SHIFT LEVER WOULD NOT MOVE OUT OF PARK. THE VEHICLE WAS TOWED TO A DEALER. AFTER THE VEHICLE WAS…
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THE CONSUMER'S MERCEDES BENZ M L 320 SLOWED DOWN ON ITS OWN. THE CONSUMER PULLED OVER PUT THE CAR IN PARK AND RESTARTED IT. *BF AFTER THIS INCIDENT THE CONSUMER PARKED IN A MALL PARKING LOT. WHEN SHE RETURNED TO THE VEHICLE THE SHIFT LEVER WOULD NOT MOVE OUT OF PARK. THE VEHICLE WAS TOWED TO A DEALER. AFTER THE VEHICLE WAS PICKED UP FROM THE DEALER IT WENT INTO STICK MODE AGAIN. THE SRS LIGHT ILLUMINATE ON THE DASH. THE VEHICLE WAS TAKEN TOT HE DEALER AND WHEN IT WAS RETURNED TO THE CONSUMER THE LIGHT WAS STILL ON. THE ENGINE LIGHT ILLUMINATED AND THE FRONT END VIBRATED. *NM
NHTSA ODI #10113591
137,000 miles · Feb 1, 2005
Engine And Engine Cooling
WITHIN SIX MONTHS, BOTH STAINLESS STEEL EXHAUST PIPES CRACKED AT THE WELDS, JUST AHEAD OF THE CAT. CONVERTER. IN THE FIRST CASE, THE PIPE WAS REPLACED. IN THE SECOND INSTANCE THE PIPE WAS WELDED (HOPEFULLY WILL LAST LONGER). WITH THE SECOND FAILURE, WHILE THE NOISE INCREASE WAS BARELY NOTICABLE, EXHAUST GASSES LEAKED INTO THE PA…
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WITHIN SIX MONTHS, BOTH STAINLESS STEEL EXHAUST PIPES CRACKED AT THE WELDS, JUST AHEAD OF THE CAT. CONVERTER. IN THE FIRST CASE, THE PIPE WAS REPLACED. IN THE SECOND INSTANCE THE PIPE WAS WELDED (HOPEFULLY WILL LAST LONGER). WITH THE SECOND FAILURE, WHILE THE NOISE INCREASE WAS BARELY NOTICABLE, EXHAUST GASSES LEAKED INTO THE PASSANGER COMPARTMENT. AS A PROFESSIONAL PILOT, I KNOW THE CONSEQUENCES OF CO POISINING.*AK
NHTSA ODI #10108388
40,539 miles · Jun 30, 2004
Engine And Engine CoolingLatches/locks/linkagesService Brakes, Hydraulic
AFTER WARRANTY EXPIRED4 YEARS AGO WITHIN 2-6 MONTHS, AND UP TO 40,539 MILES THE FOLLOWING REPAIRS WERE NECESSARY IN A MERCEDES ML 320: BRAKE STOP LAMP SWITCH ASSEMBLY, LATCHING MECHANISM RT. FRONT DOOR, OXYGEN SENSOR, -POWER STEERING RACK AND TWO TIE RODSFROM 2/17/04 TO 6/18/04. *AK
NHTSA ODI #10079089
Mileage unknown · Dec 24, 2003
Air BagsEngine And Engine CoolingCrashInjury
VARIOUS PROBLEMS INVOLVING 2000 MERCEDES BENZ ML320 / ALSO AIR BAGS FAILED TO DEPLOY.*MR CONSUMER WAS STRUCK BY ANOTHER VEHICLE CAUSING DAMAGE TO BOTH SIDES OF THE VEHICLE. ALL THE DOORS WERE SMASHED IN YET NONE OF THE SIX AIR BAGS DEPLOYED. IN ADDITION, THE CHECK ENGINE LIGHT ILLUMINATED WHILE DRIVING. VEHICLE HAS BEE…
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VARIOUS PROBLEMS INVOLVING 2000 MERCEDES BENZ ML320 / ALSO AIR BAGS FAILED TO DEPLOY.*MR CONSUMER WAS STRUCK BY ANOTHER VEHICLE CAUSING DAMAGE TO BOTH SIDES OF THE VEHICLE. ALL THE DOORS WERE SMASHED IN YET NONE OF THE SIX AIR BAGS DEPLOYED. IN ADDITION, THE CHECK ENGINE LIGHT ILLUMINATED WHILE DRIVING. VEHICLE HAS BEEN TO THE MECHANIC MANY TIMES FOR REPAIRS BUT TO NO AVAIL. CONSUMER FELT VEHICLE MAY BE DEFECTIVE AND WOULD LIKE TO EXCHANGE OR GET MONEY BACK. *PH
NHTSA ODI #10053541
30,000 miles · Oct 10, 2003
Engine And Engine Cooling
WHILE DRIVING APPROXIMATELY 20 MPH ENGINE OVERHEATED AND STARTED TO SMOKE. VEHICLE WAS TOWED TO A DEALER, WHO FOUND HARMONIC BALANCER DEFECTIVE. THIS CAUSED DAMAGE TO THE OIL PAN, RESULTING IN AN OIL LEAK AND SMOKE. *AK
NHTSA ODI #10042735
NHTSA investigations
4PE10050 · Brake Lamp Switch Failure.
Opened Dec 21, 2010 · Closed May 4, 2011
Status: closed (inferred from source dates) · Exterior Lighting:brake Lights:switch; Service Brakes, Hydraulic; Vehicle Speed Control; Vehicle Speed Control:cruise Control
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Additional source detail variants (4)
Exterior Lighting:brake Lights:switch
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Service Brakes, Hydraulic
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Vehicle Speed Control:cruise Control
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Vehicle Speed Control
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
PE07007 · Electronic Stability Control Malfunction
Opened Feb 1, 2007 · Closed Jul 11, 2007
Status: closed (inferred from source dates) · Electronic Stability Control:automatic (asc)
ODI OPENED PE07-007 AFTER RECEIVING 4 COMPLAINTS WITHIN A 6 WEEK PERIOD ALLEGING INCIDENTS OF UNCOMMANDED BRAKE APPLICATION IN MODEL YEAR (MY) 2000 THROUGH 2001 MERCEDES M CLASS SPORT UTILITY VEHICLES.INFORMATION CONTAINED IN THE REPORTS OR GATHERED IN SUBSEQUENT CONSUMER INTERVIEWS INDICATED THAT THE INCIDENTS WERE CAUSED BY FAULTS IN THE ELECTRONIC STABILITY PROGRAM (ESP) SYSTEM WHICH WERE REPAIRED BY REPLACING THE YAW RATE SENSORS.ALTHOUGH THE SAME YAW RATE SENSOR IS USED IN APPROXIMATELY 800,000 OTHER MERCEDES M-CLASS, C-CLASS AND SLK MODELS, TO DATE THERE HAS BEEN ONLY ONE RELATED COMPLAINT TO ODI IN THOSE VEHICLES. DURING THIS INVESTIGATION MERCEDES BENZ PROVIDED ODI WITH 327 COMPLAINTS RELATED TO THE ESP SYSTEM IN THE MY 2000 THROUGH 2001 M CLASS VEHICLES.SEVEN OF THE COMPLAINTS SUBMITTED BY MERCEDES ALLEGED INCIDENTS OF UNCOMMANDED BRAKE ACTIVATION WHILE DRIVING, WITH TWO OF THESE INVOLVING VEHICLES IDENTIFIED IN THE ODI COMPLAINTS.NONE OF THE INCIDENTS RESULTED IN CRASH OR INJURY.HOWEVER, THE OWNERS DID EXPRESS SAFETY CONCERNS DUE TO THE SUDDEN, UNEXPECTED CHANGE IN VEHICLE SPEED AND DIRECTION. ON MAY 10, 2007 MERCEDES BENZ MET WITH NHTSA TO PROVIDE A TECHNICAL PRESENTATION AND CONDUCT A DRIVING DEMONSTRATION OF THE ESP SYSTEM PERFORMANCE WITH SIMULATED ELECTRICAL FAULTS IN THE YAW RATE SENSOR.MERCEDES SHOWED THAT THE ESP SYSTEM IS PROGRAMMED TO DIAGNOSE ELECTRICAL FAULTS AND THAT BRAKE APPLICATIONS RESULTING FROM YAW RATE SENSOR ELECTRICAL FAULTS ARE VERY SHORT IN DURATION (0.3 SECONDS OR LESS) AND DO NOT AFFECT VEHICLE CONTROL OR STABILITY. NINE OF THE CONSUMER COMPLAINTS TO ODI AND MERCEDES ALLEGED BRAKE ACTIVATIONS LONGER THAN 0.3 SECONDS, WITH SEVERAL ALLEGING THAT THE INCIDENT LASTED UNTIL THE VEHICLE CAME TO A STOP.A COMPLAINT VEHICLE THAT ALLEGED MULTIPLE INCIDENTS WAS EVALUATED BY ODI AT THE VEHICLE RESEARCH AND TEST CENTER (VRTC) IN EAST LIBERTY, OHIO.VRTC WAS UNABLE TO DUPLICATE THE CONDITION.DUE TO THE LOW COMPLAINT RATE AND ONLY ONE NEW COMPLAINT TO ODI OR MERCEDES SINCE JANUARY 2007, THIS INVESTIGATION HAS BEEN CLOSED.ODI WILL CONTINUE TO MONITOR COMPLAINTS IN THE SUBJECT VEHICLES AND OTHER MERCEDES PRODUCTS USING THE SAME YAW RATE SENSOR AND MERCEDES WILL PROVIDE UPDATES ON FIELD EXPERIENCE (COMPLAINTS, FIELD REPORTS AND WARRANTY CLAIMS) THROUGH THE END OF 2007.
PE03058 · 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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