IllustrationTL*THE CONTACT OWNS A 2001 MERCEDES BENZ ML320. WHILE DRIVING 30 MPH THE BRAKES ACTIVATED WITHOUT INTENTION, AND THEN THE VEHICLE BEGAN SHAKING. HE THEN HEARD METAL GRINDING FROM UNDER THE VEHICLE. THE VEHICLE HAS NOT BEEN DIAGNOSED BY THE DEALER. THE CURRENT AND FAILURE MILEAGES WERE 65000.
2001 Mercedes Benz ML320
Owner reports · Recalls · Investigations
More warning signs than most ML320 years
Owner complaints for the 2001 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
130–25K
1125–50K
1950–75K
2075–100K
22100–150K
23150K+
108 reports with mileage · 28 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.
- Electronic Stability Control (esc). Review the 33 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 26 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Steering. Review the 25 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
10 crash reports7 fire reports6 injury reports
Service Brakes, Hydraulic complaints
19 reportsTL*THE CONTACT OWNS A 2001 MERCEDES ML320. WHILE TRAVELING AT 65MPH, THE VEHICLE SUDDENLY VEERED TO THE RIGHT LANE. SHE ATTEMPTED TO STEER THE VEHICLE BACK INTO HER LANE BUT LOST CONTROL OF THE VEHICLE. SHE PRESSED ON THE BREAK PEDAL BUT THEY FELL STRAIGHT TO THE FLOOR. SHE GRABBED THE STEERING WHEEL AGAIN WITH MORE FORCE.…
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TL*THE CONTACT OWNS A 2001 MERCEDES ML320. WHILE TRAVELING AT 65MPH, THE VEHICLE SUDDENLY VEERED TO THE RIGHT LANE. SHE ATTEMPTED TO STEER THE VEHICLE BACK INTO HER LANE BUT LOST CONTROL OF THE VEHICLE. SHE PRESSED ON THE BREAK PEDAL BUT THEY FELL STRAIGHT TO THE FLOOR. SHE GRABBED THE STEERING WHEEL AGAIN WITH MORE FORCE. SHE STEERED THE VEHICLE BACK TO THE LEFT AND OFF THE ROAD INTO A PATCH OF GRASS. THE VEHICLE FINALLY CAME TO A STOP. SHE HAD THE VEHICLE TOWED TO A REPAIR SHOP. THE MECHANIC COULD NOT LOCATE THE FAILURE. THE VEHICLE WAS TAKEN TO A DEALERSHIP IN WHICH THEY RAN DIAGNOSTIC TESTING. THE TECHNICIAN STATED THAT THE FAILURE OCCURED FROM A STOP LAMP SWITCH. THEY REPLACED THE PART BUT THAT DID NOT REPAIR THE FAILURE. WHILE DRIVING ON ANOTHER OCCASSION SHE LOST CONTROL OF THE VEHICLE AND BRAKE FAILURE. SHE VEERED ONTO OTHER LANES. SHE HAD THE VEHICLE TOWED TO HER HOME THIS TIME AND ATTEMPTED CONTACTING THE DEALERSHIP. THE VEHICLE IS CURRENTLY PARKED OUTSIDE OF HER HOMEUN REPAIRED. THE CURRENT AND FAILURE MILEAGE WAS 76,000. BL
WHEN DRIVING AT DIFFERENT SPEEDS THE VEHICLE APPLIES BRAKES WITHOUT DRIVER EVEN TOUCHING THEM. THIS ML320 HAS DONE IT SEVERAL TIME WHILE ON THE FREEWAY AND DOES IT AT RANDOM WITH NO WARNING. I TOOK IT TO THE DEALER AND THEY TOLD ME THAT IT WAS REALLY DANGEROUS TO DRIVE IT LIKE THAT BUT THEY STATED IN ORDER TO FIX IT WOULD BE $…
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WHEN DRIVING AT DIFFERENT SPEEDS THE VEHICLE APPLIES BRAKES WITHOUT DRIVER EVEN TOUCHING THEM. THIS ML320 HAS DONE IT SEVERAL TIME WHILE ON THE FREEWAY AND DOES IT AT RANDOM WITH NO WARNING. I TOOK IT TO THE DEALER AND THEY TOLD ME THAT IT WAS REALLY DANGEROUS TO DRIVE IT LIKE THAT BUT THEY STATED IN ORDER TO FIX IT WOULD BE $1,200 DLLS. SINCE THIS ITEM IS CONSIDERED A SAFETY HAZARD AND CAN CAUSE SERIOUS INJURY I BELIEVE THIS SHOULD BE REPAIRED BY MERCEDES AND NOT THE OWNERS. IF YOU NEED FURTHER INFORMATION ON THIS PLEASE VISIT THE MERCEDES FORUMS AND YOU WILL HAVE MORE STORIES TO READ ABOUT IT. HTTP://WWW.BENZWORLD.ORG/FORUMS/W163-M-CLASS/1345867-LEFT-FRONT-WHEEL-LOCKS-DOWN-NO-WARNING.HTML?HIGHLIGHT=YAW+SENSOR. *TR
FRONT LEFT WHEEL LOCKED WHILE DRIVING ABOUT 30 MPH. FOOT WAS NOT EVEN ON THE BRAKE PEDAL. BAS ESP LIGHTS CAME ON AND STAYED ON.*AK
MY WIFE AND TWO CHILDREN WERE NEARLY KILLED. THE RIGHT REAR WHEEL LOCKED WITHOUT WARNING SENDING MY ML320 MERCEDES BENZ SKIDDING ACROSS TWO LANES BARELY AVOIDING A DEADLY CRASH. THE DEALERSHIP HAS DIAGNOSED THE PROBLEM BUT REFUSES TO FIX IT. THEY CLAIM NO RESPONSIBILITY AND YET MY CAR SITS IN THE DRIVEWAY DEFECTIVE AND UNDRIVABL…
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MY WIFE AND TWO CHILDREN WERE NEARLY KILLED. THE RIGHT REAR WHEEL LOCKED WITHOUT WARNING SENDING MY ML320 MERCEDES BENZ SKIDDING ACROSS TWO LANES BARELY AVOIDING A DEADLY CRASH. THE DEALERSHIP HAS DIAGNOSED THE PROBLEM BUT REFUSES TO FIX IT. THEY CLAIM NO RESPONSIBILITY AND YET MY CAR SITS IN THE DRIVEWAY DEFECTIVE AND UNDRIVABLE. WHAT IS THE BEST WAY TO PURSUE THIS ISSUE ? *JB
DT*: THE CONTACT STATED WHILE DRIVING 10 MPH, THE ABS ACTIVATED WITHOUT THE BRAKE PEDAL BEING DEPRESSED. THIS STOPPED THE VEHICLE, AND CAUSED A COMPLETE STALLING OF THE ENGINE AND ELECTRICAL SYSTEM. THERE WERE NO WARNINGS PRIOR TO THE INCIDENT. THE VEHICLE WAS TAKEN TO A SERVICE DEALER, WHO DETERMINED THAT THE YAW RATE SENSOR…
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DT*: THE CONTACT STATED WHILE DRIVING 10 MPH, THE ABS ACTIVATED WITHOUT THE BRAKE PEDAL BEING DEPRESSED. THIS STOPPED THE VEHICLE, AND CAUSED A COMPLETE STALLING OF THE ENGINE AND ELECTRICAL SYSTEM. THERE WERE NO WARNINGS PRIOR TO THE INCIDENT. THE VEHICLE WAS TAKEN TO A SERVICE DEALER, WHO DETERMINED THAT THE YAW RATE SENSOR HAD MALFUNCTIONED. THIS WAS THE FOURTH INSTANCE OF THE PROBLEM OCCURRING. THE MANUFACTURER WAS ALSO NOTIFIED. THE CONSUMER STATED EMERGENCY BRAKE SYSTLEM LIGHT ILLUMINATED AND SUDDENLY HER SPEED WAS REDUCED FROM 70 MPH TO 0 AND THEN THE BRAKES LOCKED. UPDATED 01/19/07. *JB
MY VEHICLE WAS AT APPOX. 55000 MILES WHEN I WAS TOLD THE ABS PUMP WENT OUT. WHILE THE VEHICLE IS INDEED NO LONGER IN WARRANTY, THIS PART IN MY ESTIMATION SHOULD BE COVERED BY THE FACTORY. THIS PART AFFECTS THE ABS SYSTEM, THE CORRECTIVE SLIPPAGE SYSTEM AND OVERALL HANDLING OF THE VEHICLE. THIS SHOULD NOT BE DESIGNED TO FAIL AT 5…
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MY VEHICLE WAS AT APPOX. 55000 MILES WHEN I WAS TOLD THE ABS PUMP WENT OUT. WHILE THE VEHICLE IS INDEED NO LONGER IN WARRANTY, THIS PART IN MY ESTIMATION SHOULD BE COVERED BY THE FACTORY. THIS PART AFFECTS THE ABS SYSTEM, THE CORRECTIVE SLIPPAGE SYSTEM AND OVERALL HANDLING OF THE VEHICLE. THIS SHOULD NOT BE DESIGNED TO FAIL AT 55000 MILES UNDER NORMAL CONDITIONS WHICH THIS IS. *JB
SAFETY SYSTEM FAILURE, INCLUDING BRAKING ASSIST, SEAT BELTS, AIR BAGS AND TEL-AIDE DUE TO COMPUTER CHIP FAILURE. CAUSED TWO ACCIDENTS AFTER WHICH CUSTOMER PAID TO HAVE VEHICLE REVIEWED BUMPER TO BUMPER AND THE FAILING CHIP WAS REPLACED. DURING THIS TIME, THE DASH WARNING LIGHTS DID NOT ILLUMINATE TO WARN OF THE FAILURE WHICH T…
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SAFETY SYSTEM FAILURE, INCLUDING BRAKING ASSIST, SEAT BELTS, AIR BAGS AND TEL-AIDE DUE TO COMPUTER CHIP FAILURE. CAUSED TWO ACCIDENTS AFTER WHICH CUSTOMER PAID TO HAVE VEHICLE REVIEWED BUMPER TO BUMPER AND THE FAILING CHIP WAS REPLACED. DURING THIS TIME, THE DASH WARNING LIGHTS DID NOT ILLUMINATE TO WARN OF THE FAILURE WHICH THE VEHICLE COMPUTER DOCUMENTED 15 TIMES IN A SIX-MONTH PERIOD (BETWEEN THE TWO ACCIDENTS). APPROXIMATELY EIGHT MONTHS LATER, THE WARNING LIGHT ON THE DASH ILLUMINATED AGAIN. DO NOT KNOW HOW MANY TIMES SYSTEM HAD FAILED SINCE IT WAS 'FIXED.' TRADED IN VEHICLE FOR SAFETY PURPOSES. *JB
THE DEFECT STATED IN RECALL 03 V 121 000 FOR THE POWER STEERING HOSE CLAMP HAPPENED WHILE THE CONSUMER WAS WAITING TO BE NOTIFIED. *AK THE CONSUMER EXPERIENCED THE FOLLOWING: THE ENTIRE INSTRUMENT CLUSTER LIT UP AND FLASHED AND BEEPED, LOST THE SPEEDOMETER, TACHOMETER, GAS/GAS TEMPERATURE GAUGE, AND THE VEHICLE HAD GONE INT…
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THE DEFECT STATED IN RECALL 03 V 121 000 FOR THE POWER STEERING HOSE CLAMP HAPPENED WHILE THE CONSUMER WAS WAITING TO BE NOTIFIED. *AK THE CONSUMER EXPERIENCED THE FOLLOWING: THE ENTIRE INSTRUMENT CLUSTER LIT UP AND FLASHED AND BEEPED, LOST THE SPEEDOMETER, TACHOMETER, GAS/GAS TEMPERATURE GAUGE, AND THE VEHICLE HAD GONE INTO SECOND GEAR AND DID COME OUT FOR SOME TIME(DISCOVERED IT WAS IN LIMP-HOME MODE). THE SERVICE DEALER ADVISED THE CONSUMER THAT THE PROBLEM WAS THE GEAR SELECTOR. THE INSTRUMENT CLUSTER LIGHTS HAD GONE OFF, EXCEPT FOR THE BAS/BRAKE ASSIST SYSTEM LIGHT, THE GAUGES, SPEEDOMETER, AND TACHOMETER HAD RESUMED. THERE WAS AN INCIDENT WHERE HALF OF INSTRUMENT CLUSTER DISPLAY ON THE LEFT LIT UP, ALTHOUGH THE VEHICLE CONTINUED TO RUN. THE SERVICE DEALER THOUGHT THE PROBLEM MAY HAVE BEEN THE BATTERY. DURING A RAINSTORM, THE ENTIRE INSTRUMENT PANEL LIT UP, THE TACHOMETER, SPEEDOMETER, AND THE GAS GAUGE STOPPED AND THE INSTRUMENT PANEL KEPT BEEPING INTERMITTENTLY BUT DID NOT GO INTO LIMP MODE. THERE WAS A CRACK IN ONE OF THE D-PILLARS, AND THE REAR HATCH LOCK DID NOT WORK. THE IGNITION LOCK SEEMED LOOSE SINCE THE GEAR SHIFT ASSEMBLY HAD BEEN REPLACED, THE WINDSHIELD WASHER RESERVOIR LEAKED. THE BAS/ESP CONTROL MODULE HAD BEEN CHANGED, BUT THE PROBLEM PERSISTED. THE CONSUMER WAS TOLD THE VEHICLE NEEDED A NEW BATTERY. THE BRAKE PAD WEAR LIGHT DISPLAYED, THE POWER STEERING HAD FAILED AGAIN. THE CONSUMER WAS ADVISED THE VEHICLE NEEDED FRONT AND REAR BRAKES THEN WAS TOLD THAT IT WAS A CLAMP PROBLEM. ALSO THE DRIVER'S WINDOW SWITCH HESITATED. THE SAFETY RECALL NOTICE THAT RELATED TO THE FAILURE OF THE HOSE CLAMP FOR THE POWER STEERING FLUID WHICH APPARENTLY CAUSED THE COMPLETE LOSS OF POWER STEERING IN THE VEHICLE AS WELL AS DAMAGE TO THE HYDRAULIC FLUID PUMP WHICH RESULTED IN REPAIRS PERFORMED ON THE VEHICLE. THE CONSUMER REQUESTED FULL REIMBURSEMENT FOR THE CHARGES RELATED TO THE REPAIRS. RECALL# 03V121000 *SCC *JB
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
3PE10050 · 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.
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.