NHTSA owner reports · September 18, 2026 snapshot.
What owners actually said
166 reports80,300 miles · Apr 13, 2010
Service Brakes, Hydraulic
2000 MERCEDES BENZ ML320 WHILE DRIVING 45MPH THE BRAKES CAME ON SUDDENLY WITHOUT DEPRESSING THE BRAKE PEDAL. THE BRAKES LOCKED AND THEN RELEASED ITSELF. THE BAS ESP LIGHT CAME ON. THEN THE VEHICLE WAS ABLE TO DRIVE FINE. THE DEALER COULD NOT FIND THE FAILURE. THIS STATED ONLY A FEW SENSOR HAS GONE BAD ONCE AGAIN. THIS FAILURE…
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2000 MERCEDES BENZ ML320 WHILE DRIVING 45MPH THE BRAKES CAME ON SUDDENLY WITHOUT DEPRESSING THE BRAKE PEDAL. THE BRAKES LOCKED AND THEN RELEASED ITSELF. THE BAS ESP LIGHT CAME ON. THEN THE VEHICLE WAS ABLE TO DRIVE FINE. THE DEALER COULD NOT FIND THE FAILURE. THIS STATED ONLY A FEW SENSOR HAS GONE BAD ONCE AGAIN. THIS FAILURE OCCURRED FOUR TO SIX TIMES. *TR
NHTSA ODI #10325468
141,772 miles · Apr 8, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. WHILE DRIVING APPROXIMATELY 45 MPH, THE BRAKES SUDDENLY ENGAGED ALTHOUGH THE CONTACT THAT HAD NOT DEPRESSED THE BRAKE PEDAL. THE BRAKES LOCKED AND THEN RELEASED WITHIN TWO TO THREE MINUTES. THERE WERE NO WARNING LIGHTS PRIOR TO THE FAILURE BUT THE ESP LIGHT ILLUMINATED WHEN THE VEH…
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TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. WHILE DRIVING APPROXIMATELY 45 MPH, THE BRAKES SUDDENLY ENGAGED ALTHOUGH THE CONTACT THAT HAD NOT DEPRESSED THE BRAKE PEDAL. THE BRAKES LOCKED AND THEN RELEASED WITHIN TWO TO THREE MINUTES. THERE WERE NO WARNING LIGHTS PRIOR TO THE FAILURE BUT THE ESP LIGHT ILLUMINATED WHEN THE VEHICLE STOPPED. THE VEHICLE WAS TOWED TO AN AUTHORIZED DEALER BUT THE DEALER COULD NOT FIND THE CAUSE OF FAILURE. THE FAILURE OCCURRED THREE TIMES. AFTER THE SECOND FAILURE, THE DEALER STATED THAT THE ESP PUMP VOLTAGE RELAY STUCK HAD A SHORTAGE IN SOME OF THE WIRES. THE RELAY WAS REPLACED; HOWEVER, AFTER THE THIRD FAILURE, THE DEALER COULD NOT PINPOINT THE CAUSE OF THE FAILURE. THE CONTACT DID NOT CALL THE MANUFACTURER AND THE VEHICLE HAD NOT BEEN REPAIRED WHEN THE COMPLAINT WAS FILED. THE FAILURE MILEAGE WAS 93,648. UPDATED 05/18/10. *LJ
NHTSA ODI #10324443
57,000 miles · Feb 12, 2010
Engine And Engine CoolingVehicle Speed Control
I WAS DRIVING UP HILL IN SLOW TRAFFIC FOR ABOUT 5 TO 10 MILES PER HOUR FOR A FEW MILES THEN ALL THE SUDDEN LEARNED CAR DID NOT RESPOND TO THE GAS PEDAL I PUT PRESSURE ON. THE CAR JERK A LITTLE BID AND WON'T MOVE MUCH ONLY BY THE INCHES. THEN I HAD TO PULL OFF THE ROAD. I TURNED OFF THE ENGINE AND WAITED FOR FEW MINUTES AND STAR…
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I WAS DRIVING UP HILL IN SLOW TRAFFIC FOR ABOUT 5 TO 10 MILES PER HOUR FOR A FEW MILES THEN ALL THE SUDDEN LEARNED CAR DID NOT RESPOND TO THE GAS PEDAL I PUT PRESSURE ON. THE CAR JERK A LITTLE BID AND WON'T MOVE MUCH ONLY BY THE INCHES. THEN I HAD TO PULL OFF THE ROAD. I TURNED OFF THE ENGINE AND WAITED FOR FEW MINUTES AND STARTED AGAIN, TURNED AROUND AND CANCELLED MY TRIP. A SIMILAR INSTANCE HAPPENED ONCE BEFORE SEVERAL YEARS AGO. I TOOK THE CAR TO THE DEALER AND THEY FOUND NOTHING WRONG. *TR
NHTSA ODI #10308928
64,000 miles · Feb 4, 2010
Seats
TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. THE CONTACT TRIED TO REMOVE ONE OF THE REAR SEATS IN THE VEHICLE AND NOTICED THAT TWO OF THE BOLTS ROTATED AND WOULD NOT RELEASE. THE FAILURE CONFIRMED THAT THE BOLTS WERE IMPROPERLY WELDED. HE HAS NOT TAKEN THE VEHICLE TO THE DEALER BUT THE MANUFACTURER INSTRUCTED HIM TO TAKE IT …
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TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. THE CONTACT TRIED TO REMOVE ONE OF THE REAR SEATS IN THE VEHICLE AND NOTICED THAT TWO OF THE BOLTS ROTATED AND WOULD NOT RELEASE. THE FAILURE CONFIRMED THAT THE BOLTS WERE IMPROPERLY WELDED. HE HAS NOT TAKEN THE VEHICLE TO THE DEALER BUT THE MANUFACTURER INSTRUCTED HIM TO TAKE IT TO A DEALER. THE VEHICLE HAS NOT BEEN REPAIRED AT THE TIME OF THE COMPLAINT. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 64,000. UPDATED 03/09/10 *BF UPDATED 04/29/10.*JB
NHTSA ODI #10305232
Mileage unknown · Dec 7, 2009
Electrical System
I PARKED MY CAR IN A STRIP MALL FOR DINNER. WHEN I TRIED TO RESTART THE CAR AFTER DINNER, IT WOULDN'T CRANK, NOR WOULD IT START. CALLED IN AAA AND BY THE TIME THEY SHOWED UP HALF AN HOUR LATER, THE CAR STARTED FINE. TWO DAYS LATER, WHEN I WAS DRIVING TAKING MY DAUGHTER TO SCHOOL AROUND 7:45AM ON A SURFACE STREET, MY CAR SUDDENLY…
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I PARKED MY CAR IN A STRIP MALL FOR DINNER. WHEN I TRIED TO RESTART THE CAR AFTER DINNER, IT WOULDN'T CRANK, NOR WOULD IT START. CALLED IN AAA AND BY THE TIME THEY SHOWED UP HALF AN HOUR LATER, THE CAR STARTED FINE. TWO DAYS LATER, WHEN I WAS DRIVING TAKING MY DAUGHTER TO SCHOOL AROUND 7:45AM ON A SURFACE STREET, MY CAR SUDDENLY LOST ALL POWER AND THE ENGINE STALLED. I HAD TO QUICKLY TURN INTO A DRIVE WAY TO AVOID OTHER CARS AND THE CAR STOPPED AT THE ENTRANCE. AGAIN CALLED AAA AND A TOW TRUCK SHOWED UP 5 MINUTES AND THE DRIVERS HELPED PUSH AND PARK MY CAR, BUT WAS TOLD TO WAIT AT LEAST 45 MINUTES FOR THE RIGHT TOW TRUCK. TRIED TO START MY CAR EVERY 5 MINUTES, AND IT FINALLY STARTED AFTER 15 MINUTES. I WAS ABLE TO DRIVE TO A FLETCHER JONES DEALER AND PAID $600 TO HAVE A SENSOR REPLACED TO FIX THE STALLING PROBLEM. THE SERVICE MANAGER WAS FAMILIAR WITH THE THIS PROBLEM AND MY FRIENDS WHO OWNED 98, 99 ML320 ALSO EXPERIENCED THIS STALLING PROBLEM. I BELIEVE THIS IS A SAFETY ISSUE (EVEN THE SERVICE MANAGER AT FLETCHER JONES AGREED WITH ME ON THIS). I THANKED GOD THAT MY DAUGHTER AND I WERE NOT HURT IN THIS INCIDENT, BUT AN ACCIDENT COULD HAVE BEEN EASILY HAPPENED. SINCE THIS PROBLEM HAS OCCURRED IN DIFFERENT ML320 MODEL YEARS, AND IT COST THE DRIVER A BUNDLE TO HAVE IT FIXED, MERCEDES BENZ SHOULD ISSUE A RECALL TO FIX THIS PROBLEM. *TR
NHTSA ODI #10294683
Mileage unknown · Nov 2, 2009
Structure
EXCESSIVE RUST WITHIN 3 YEARS OF PURCHASE. *TR
NHTSA ODI #10290691
Mileage unknown · May 8, 2009
Steering
CONSUMER IS REQUESTING A REFUND FOR THE RECALL #2003-040005 ON HER 2000 MERCEDES-BENZ ML320. *NJ THE POWER STEERING RESERVOIR, SEAL, PUMP, FLUID AND STEERING HOSE CLAMP WERE ALL REPLACED. RECALL 03V121000. *JB
NHTSA ODI #10268148
114,000 miles · Mar 8, 2009
Electronic Stability Control (esc)
SAME PROBLEM AS DISCUSSED IN NHTSA PE 07007-LEFT FRONT BRAKE ENGAGES FOR NO REASON-ESP/BAS LIGHT COMES ON-THIS LAST FOR A COUPLE OF SECONDS AND AS STATED AFTER STOPPING AND RESTARTING ENGINE SEEM TO GO AWAY FOR SEVERAL DAYS. *TR
NHTSA ODI #10261081
87,582 miles · Feb 4, 2009
Engine And Engine CoolingSteering
TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. THE CONTACT RECEIVED A RECALL NOTICE FOR NHTSA CAMPAIGN ID NUMBER 03V121000 (STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS) AND HAD THE NECESSARY REPAIRS PERFORMED BY THE DEALER. HOWEVER, SHE CONTINUED TO EXPERIENCE FAILURES WITH THE POWER STEERING FLUID LEAKING. …
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TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. THE CONTACT RECEIVED A RECALL NOTICE FOR NHTSA CAMPAIGN ID NUMBER 03V121000 (STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS) AND HAD THE NECESSARY REPAIRS PERFORMED BY THE DEALER. HOWEVER, SHE CONTINUED TO EXPERIENCE FAILURES WITH THE POWER STEERING FLUID LEAKING. THE STEERING WHEEL BECAME MORE DIFFICULT TO TURN OVER TIME. ON A SEPARATE OCCASION, SHE RECEIVED A SECOND RECALL NOTICE FOR NHTSA CAMPAIGN ID NUMBER 08V465000 (STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS). THE DEALER STATED THAT THE HOSE CLAMP USED TO SECURE THE POWER STEERING FLUID COOLING HOSE TO THE POWER STEERING FLUID COOLER NEEDED TO BE REPLACED AT THE COST OF $1,200. THE DEALER STATED THAT IT WOULD BE POINTLESS TO REPAIR THE VEHICLE ACCORDING TO THE RECALL WHEN ADDITIONAL COMPONENTS WERE AFFECTED AS A RESULT OF THE STEERING FAILURE. THE INITIAL RECALL STATED THAT CONSUMERS WHO HAD REPAIRS MADE BEFORE NOVEMBER 23, 2003 COULD POSSIBLY HAVE THE HOSE REPLACED, IF FOUND DEFECTIVE. THE CONTACT HAD REPAIRS MADE PRIOR TO THAT DATE. SHE ALSO EXPERIENCED FAILURES WITH THE CATALYTIC CONVERTER AND THE CHECK ENGINE INDICATOR CONTINUED TO ILLUMINATE ON THE INSTRUMENT PANEL. AFTER THE REPAIRS WERE MADE, THE CHECK ENGINE INDICATOR CONTINUED TO ILLUMINATE. THE DEALER COULD NOT DUPLICATE THE FAILURE AND STATED THAT IT WAS NOT RELATED TO THE POWER STEERING. THE FAILURE MILEAGE WAS 87,582 AND CURRENT MILEAGE WAS 190,000.
NHTSA ODI #10257506
99,619 miles · Dec 26, 2008
Steering
TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. THE CONTACT STATED THAT SHE RECEIVED A RECALL NOTICE FOR NHTSA CAMPAIGN ID NUMBER 08V465000 (STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS) AND IMMEDIATELY SCHEDULED AN APPOINTMENT TO HAVE THE VEHICLE REPAIRED. AFTER THE REPAIR, SHE NOTICED FLUID NEAR THE FRONT DR…
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TL*THE CONTACT OWNS A 2000 MERCEDES BENZ ML320. THE CONTACT STATED THAT SHE RECEIVED A RECALL NOTICE FOR NHTSA CAMPAIGN ID NUMBER 08V465000 (STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS) AND IMMEDIATELY SCHEDULED AN APPOINTMENT TO HAVE THE VEHICLE REPAIRED. AFTER THE REPAIR, SHE NOTICED FLUID NEAR THE FRONT DRIVER'S SIDE TIRE. THE DEALER STATED THAT SHE NEEDED TO REPLACE THE RACK AND PINION; HOWEVER, THEY COULD NOT IDENTIFY THE SPECIFIC CAUSE OF THE FAILURE. THE CONTACT IS IN THE PROCESS OF HAVING THE VEHICLE INSPECTED AND NOTIFYING THE MANUFACTURER. THE FAILURE AND CURRENT MILEAGES WERE 99,619.
NHTSA ODI #10252829
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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