NHTSA owner reports · September 18, 2026 snapshot.
Vehicle Speed Control complaints
16 reportsClear category filterMileage unknown · Jun 18, 2026
Vehicle Speed Control
The failed component is the YAW rate sensor, original part number A1635426340 (ATE part number 10.0980-0454.2), manufactured by ATE. I have experienced multiple incidents of sudden, unintended braking at highway speeds. These events occurred without warning and created an immediate and significant risk of a serious collision, e…
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The failed component is the YAW rate sensor, original part number A1635426340 (ATE part number 10.0980-0454.2), manufactured by ATE. I have experienced multiple incidents of sudden, unintended braking at highway speeds. These events occurred without warning and created an immediate and significant risk of a serious collision, endangering not only myself and my family but also other motorists sharing the roadway. While the defect has not been reproduced or confirmed by either a Mercedes-Benz dealer or an independent repair facility, the absence of a successful diagnosis does not diminish the seriousness of the safety hazard. In fact, your agency opened an investigation into this issue in 2007, yet no corrective action was ultimately taken despite reports indicating that more than 100,000 vehicles may have been affected. According to publicly available information, Mercedes-Benz inspected and evaluated the YAW rate sensor in May 2007 as part of its review of this issue. The continued occurrence of sudden, unintended braking events raises concerns that the underlying defect may not have been fully addressed. Most concerning is that there were no warning lamps, fault messages, or other observable symptoms prior to the braking events. The vehicle operated normally until the moment the unintended braking occurred, leaving the driver with no opportunity to anticipate or prevent a potentially catastrophic situation.
NHTSA ODI #11745171
150,000 miles · Aug 15, 2016
Electronic Stability Control (esc)Service BrakesVehicle Speed Control
ON MORE THAN ONE OCCASION, MY 2001 MERC BENZ ML320 CAME TO A COMPLETE STOP AND DRAMATICALLY PULLED TO THE RIGHT WHILE I WAS DRIVING AT VARIOUS SPEEDS. THE FIRST TIME HAPPENED AS I WAS MAKING A RIGHT TURN FROM A STAND STILL. THE SECOND TIME HAPPENED AS I WAS TRAVELING AT APPROXIMATELY 35-40 MPH. FINALLY, THE LAST TWO TIMES OCCURR…
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ON MORE THAN ONE OCCASION, MY 2001 MERC BENZ ML320 CAME TO A COMPLETE STOP AND DRAMATICALLY PULLED TO THE RIGHT WHILE I WAS DRIVING AT VARIOUS SPEEDS. THE FIRST TIME HAPPENED AS I WAS MAKING A RIGHT TURN FROM A STAND STILL. THE SECOND TIME HAPPENED AS I WAS TRAVELING AT APPROXIMATELY 35-40 MPH. FINALLY, THE LAST TWO TIMES OCCURRED WHILE I WAS ON THE HIGHWAY TRAVELING AT APPROXIMATELY 65-70 MPH. IN ALL INSTANCES, THE FRONT BRAKES ABSOLUTELY LOCKED AND MY VEHICLE CAME TO AN APPROXIMATELY COMPLETE STOP WHILE PULLING THE STEERING TO THE RIGHT. EACH EVENT WAS A VERY FRIGHTENING EPISODE. ALTHOUGH I KEPT TRYING TO ACCELERATE, THE BRAKES WOULD NOT ALLOW IT. I HAD JUST ENOUGH MOMENTUM SO THAT I COULD VEER TO THE SAFETY OF THE SAFETY LANE. THE EVENTS ALL HAPPENED WITHIN A TWO (2) WEEK PERIOD...FAR, FAR TOO FREQUENT FOR COMFORT. IN ALL OCCASIONS, I WAS FORTUNATE TO NOT GET RAMMED BY THE VEHICLES TRAVELING BEHIND ME. NOW THAT I HAVE DONE A LITTLE RESEARCH I AM REALLY DISAPPOINTED THAT MERCEDES SEEMS TO BE AWARE OF THE ISSUE BUT HAS NOT TAKEN THIS ISSUE MORE SERIOUSLY AS IT SEEMS TO NOT HAVE BEEN AN ISOLATED ISSUE BUT RATHER ONE THAT HAS BEEN CONSISTENT AMONG FELLOW ML 320 VEHICLE OWNERS. LASTLY, I'VE ONLY OWNED THIS TRUCK FOR A TWO WEEK PERIOD, AND IT HAS TERRIFIED ME IN THIS SHORT TIME.
NHTSA ODI #10896133
163,230 miles · Jul 25, 2016
Power TrainService BrakesVehicle Speed Control
DURING BRAKING THE BAS/ESP WILL COME ON CAUSING NO ACCELERATION WITH THE VEHICLE. THIS HAS HAPPENED 7 TIMES IN THE LAST 3 DAYS. ALMOST RESULTING IN 2 ACCIDENTS. ONLY TUNING OFF AND THE THE VEHICLE WILL TEMPORALLY FIX THE ISSUE.
NHTSA ODI #10888285
134,850 miles · Dec 15, 2013
Electronic Stability Control (esc)Service BrakesVehicle Speed Control
I AM HAVING SAFETY ISSUES WITH MY 2001 MERCEDES BENZ ML 320 WITH A ESP BAS LIGHT COMING ON AND LOCKING FRONT BRAKE CAUSING THE ABS TO COME ON AND STOP SUV. TO AVOID AN ACCIDENT AND ALMOST GETTING REAR ENDED WITH MY KIDS IN CAR. CONTACTED MERCEDES DEALER AND CANT GUARANTEE WHAT PROBLEM IS ALREADY CHANGED BRAKE LIGHT SWITCH 2 TIME…
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I AM HAVING SAFETY ISSUES WITH MY 2001 MERCEDES BENZ ML 320 WITH A ESP BAS LIGHT COMING ON AND LOCKING FRONT BRAKE CAUSING THE ABS TO COME ON AND STOP SUV. TO AVOID AN ACCIDENT AND ALMOST GETTING REAR ENDED WITH MY KIDS IN CAR. CONTACTED MERCEDES DEALER AND CANT GUARANTEE WHAT PROBLEM IS ALREADY CHANGED BRAKE LIGHT SWITCH 2 TIMES SAID IT COULD BE ABS PUMP {800} OR WHEEL SPEED SENSORS {1200} OR YAW SENSOR, IGNITION SWITCH, MAYBE EVEN COMPUTER BUT SAID THEY COULD NOT GUARANTEE TO FIX THIS PROBLEM. MERCEDES BENZ SHOULD HAVE A RECALL ON THIS ISSUE IT HAS BEEN GOING ON FOR YEARS SOME ONE IS GOING TO GET KILLED. SPOKE TO BENZ AT CORPORATE AND THEY ONLY SAY BRING IT TO THE DEALER WHO DOES NOT KNOW HOW TO FIX THIS PROBLEM. HOPE I CAN GET A ANSWER TO THIS SITUATION. *TR
NHTSA ODI #10556140
125,000 miles · Aug 8, 2013
Service BrakesSteeringVehicle Speed Control
I WAS DRIVING APPROXIMATELY 25 MPH GETTING ONTO THE HIGHWAY WHEN ALL OF A SUDDEN MY BRAKES SEEMED TO LOCK UP. MY VEHICLE JERKED VIOLENTLY AND I HEARD THIS AWFUL GRINDING NOISE. I WAS NARROWLY MISSED BY THE VEHICLE BEHIND ME AS THE JERK SLAMMED MY VEHICLE TO A HALT AND TURNED MY WHEELS CAUSING MY STEERING WHEEL TO JERK AS WELL. I…
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I WAS DRIVING APPROXIMATELY 25 MPH GETTING ONTO THE HIGHWAY WHEN ALL OF A SUDDEN MY BRAKES SEEMED TO LOCK UP. MY VEHICLE JERKED VIOLENTLY AND I HEARD THIS AWFUL GRINDING NOISE. I WAS NARROWLY MISSED BY THE VEHICLE BEHIND ME AS THE JERK SLAMMED MY VEHICLE TO A HALT AND TURNED MY WHEELS CAUSING MY STEERING WHEEL TO JERK AS WELL. I WAS ABLE TO PULL OFF TO THE SIDE OF THE ROAD AND SAT THERE FOR A WHILE AND ONCE AGAIN TRIED TO PROCEED AHEAD AND ALMOST IMMEDIATELY THE SAME INCIDENT HAPPENED. I CALLED A TOW TRUCK AND HAD THE VEHICLE TOWED TO A MERCEDES DEALER WHO KEPT THE VEHICLE FOR THREE DAYS AND COULD NOT RECREATE THE ISSUE HOWEVER THEY STATED THAT THE YAW SENSOR CAME UP AS FAULTY DURING THE DIAGNOSTIC. I WENT TO PICK UP THE VEHICLE AND AS THE TECH DROVE IT UP IT AGAIN STARTED JERKING. $1000 LATER THE YAW SENSOR HAS BEEN REPLACED BUT I FEEL LIKE THIS ISSUE IS DEFINITELY A SAFETY HAZARD. I AM JUST THANKFUL THAT MY 18 MONTH OLD SON WASN'T IN THE CAR WITH ME AT THE TIME AS HAD HE BEEN AND SOMEONE HIT US FROM BEHIND BECAUSE OF THE ABRUPT STOP, HE SURELY WOULD HAVE BEEN INJURED. THIS NEEDS TO BE LOOKED INTO IMMEDIATELY AND RECALLED AS IT IS A SAFETY ISSUE. I BELIEVE THAT MERCEDES SHOULD DEEM THIS A RECALL, FIXING THE ISSUE FOR THOSE OUT THERE WHO HAVE NOT YET EXPERIENCED IT AND REIMBURSING THOSE OF US WHO HAVE HAD TO SPEND $1000 REPLACING WHAT IS SUPPOSED TO BE A SYSTEM PUT IN PLACE FOR SAFETY. *TR
NHTSA ODI #10534293
215,000 miles · Oct 2, 2012
Electronic Stability Control (esc)Service Brakes, HydraulicVehicle Speed Control
WHILE DRIVING ON FREEWAY IN MODERATE TRAFFIC THE CAR SUDDENLY WITHOUT ANY WARNING VIOLENTLY APPLIED UNEVEN POWER TO DIFFERENT WHEELS, BRAKE AND SPED UP. ORIGINALLY I THOUGHT WE WERE HAVING AN EARTHQUAKE AS I WAS TRYING TO REGAIN CONTROL OVER CAR. AFTER ABOUT 15 SECONDS AS I SLOWED CAR RESUMED NORMAL OPERATION. ABOUT 10 MILES LA…
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WHILE DRIVING ON FREEWAY IN MODERATE TRAFFIC THE CAR SUDDENLY WITHOUT ANY WARNING VIOLENTLY APPLIED UNEVEN POWER TO DIFFERENT WHEELS, BRAKE AND SPED UP. ORIGINALLY I THOUGHT WE WERE HAVING AN EARTHQUAKE AS I WAS TRYING TO REGAIN CONTROL OVER CAR. AFTER ABOUT 15 SECONDS AS I SLOWED CAR RESUMED NORMAL OPERATION. ABOUT 10 MILES LATER THE ACTION REPEATED MAKING ME FEAR A CRASH OR ROLL OVER AS I WAS FIGHTING TO REGAIN CONTROL AND EXIT FREEWAY. LUCKILY I WAS ABLE TO EXIT AND GAIN CONTROL. ENDED UP HAVING CAR TOWED 175 MILES HOME. MECHANIC AT DEALERSHIP NOW SAYS IT WAS A DEFECTIVE YAW SENSOR DESIGNED TO WORK IN CONJUNCTION WITH THE ESP TO PREVENT A ROLL OVER. HOWEVER THE DEFECTIVE SENSOR EASILY COULD HAVE CAUSED A ROLL OVER OR A CRASH WITH A LESS EXPERIENCED AND PHYSICALLY STRONG DRIVER. INDEED, HAD MY WIFE BEEN DRIVING I DO NOT KNOW WHETHER SHE COULD HAVE CONTROLLED THE VEHICLE. HAD THERE BEEN ONE OF THE MANY 18 WHEELERS IMMEDIATELY NEXT TO ME I DO NOT KNOW WHETHER I COULD HAVE AVOIDED A COLLISION. AFTER THE FACT IN REVIEW ON GOOGLE I NOTED MANY VERY SIMILAR COMPLAINTS FOR THE SAME 2001 MBZ ML320. I BELIEVE THERE SHOULD BE A RECALL BEFORE THERE IS DEATH OR SERIOUS INJURY. *TR
NHTSA ODI #10478371
85,000 miles · Sep 12, 2011
Vehicle Speed ControlCrash
TL* THE CONTACT OWNS A 2001 MERCEDES ML320. WHILE DRIVING APPROXIMATELY 65 MPH THE CONTACT DEPRESSED THE BRAKES AND THE CRUISE CONTROL WOULD NOT DISENGAGE. THE CONTACT CRASHED INTO A DITCH AND WAS ABLE TO TURN THE IGNITION OFF. THERE WAS NO MENTION OF WHETHER A POLICE REPORT WAS FILED OR IF THERE WERE ANY INJURIES. THE FAILURE …
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TL* THE CONTACT OWNS A 2001 MERCEDES ML320. WHILE DRIVING APPROXIMATELY 65 MPH THE CONTACT DEPRESSED THE BRAKES AND THE CRUISE CONTROL WOULD NOT DISENGAGE. THE CONTACT CRASHED INTO A DITCH AND WAS ABLE TO TURN THE IGNITION OFF. THERE WAS NO MENTION OF WHETHER A POLICE REPORT WAS FILED OR IF THERE WERE ANY INJURIES. THE FAILURE OCCURRED INTERMITTENTLY. THE VEHICLE WAS INCLUDED IN THE RECALL UNDER NHTSA CAMPAIGN ID NUMBER: 11V208000 (VEHICLE SPEED CONTROL:CRUISE CONTROL). THE VEHICLE WAS TAKEN TO THE DEALER WHERE THE TECHNICIANS WERE UNABLE TO PROVIDE ASSISTANCE BECAUSE THEY WERE UNAWARE OF THE RECALL. THE CONTACT MADE SEVERAL ATTEMPTS TO CALL THE MANUFACTURER AND DID NOT RECEIVE A CALL BACK WITH INFORMATION ABOUT THE RECALL REPAIRS. THE VEHICLE WAS NOT REPAIRED. THE APPROXIMATE FAILURE MILEAGE WAS 85,000.
NHTSA ODI #10424718
92,000 miles · Jun 7, 2011
Fuel System, GasolineVehicle Speed Control
TL* THE CONTACT OWNS A 2001 MERCEDES ML320. THE CONTACT WAS DRIVING WITH THE CRUISE CONTROL SET AT 65 MPH. WHEN SHE ATTEMPTED TO DISENGAGED THE CRUISE CONTROL BT TAPPING THE BRAKES, THE VEHICLE WOULD NOT DECELERATE. IN ORDER TO STOP THE VEHICLE, SHE HAD TO TURN THE VEHICLE COMPLETELY OFF AND AS A RESULT ,THE VEHICLE RAN OFF THE …
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TL* THE CONTACT OWNS A 2001 MERCEDES ML320. THE CONTACT WAS DRIVING WITH THE CRUISE CONTROL SET AT 65 MPH. WHEN SHE ATTEMPTED TO DISENGAGED THE CRUISE CONTROL BT TAPPING THE BRAKES, THE VEHICLE WOULD NOT DECELERATE. IN ORDER TO STOP THE VEHICLE, SHE HAD TO TURN THE VEHICLE COMPLETELY OFF AND AS A RESULT ,THE VEHICLE RAN OFF THE ROAD. THE DEALER WAS CONTACTED WHO ADVISED HER TO BRING IN THE VEHICLE FOR A DIAGNOSTIC TEST. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE BUT DID NOT OFFER ANY ASSISTANCE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 92,000 AND THE CURRENT MILEAGE WAS 93,000.
NHTSA ODI #10405442
161,000 miles · Feb 23, 2011
Vehicle Speed Control
2001 MB ML320 WHEN PUSH THE BRAKE THE CRUISE CONTROL DID NOT DISENGAGED THE CAR DID NOT STOP HAD TO PUSH THE GEAR TO N. *TR
NHTSA ODI #10384080
95,000 miles · Aug 31, 2010
Vehicle Speed Control
MERCEDES BENZ HAS A SERIOUS DESIGN AND QUALITY CONTROL PROBLEM. WHILE DRIVING THE BRAKE SWITCH FAILS CAUSING THE CRUISE CONTROL TO ACCELERATE. THE MERCEDES BENZ SERVICE MANAGER AND LEAD MECHANIC BOTH ACKNOWLEDGED AND EXPLAINED THIS PROBLEM TO ME NOTING THAT CURRENT MODELS COULD SUFFER FROM THE SAME DESIGN AND THEY'VE BEEN HAVI…
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MERCEDES BENZ HAS A SERIOUS DESIGN AND QUALITY CONTROL PROBLEM. WHILE DRIVING THE BRAKE SWITCH FAILS CAUSING THE CRUISE CONTROL TO ACCELERATE. THE MERCEDES BENZ SERVICE MANAGER AND LEAD MECHANIC BOTH ACKNOWLEDGED AND EXPLAINED THIS PROBLEM TO ME NOTING THAT CURRENT MODELS COULD SUFFER FROM THE SAME DESIGN AND THEY'VE BEEN HAVING PROBLEMS WITH THEIR VENDOR PROVIDING FAULTY BRAKE SWITCHES. I WAS DRIVING MY 2001 ML320 WITH CRUISE CONTROL AT 60 MPH. I TAPPED THE BRAKE TO DISENGAGE THE CRUISE CONTROL AS I WAS EXITING THE FREEWAY. THE CAR BEGAN TO ACCELERATE. I BRAKED HARDER AND THE CAR INCREASED ACCELERATION TO THE POINT OF ALMOST OVER POWERING MY EFFORTS TO BRAKE. I WAS PANICKED SO I STEPPED ON THE PARKING BRAKE, PUT THE CAR IN NEUTRAL, THE ENGINE RACED HARDER AND HARDER, AS I PULLED OFF THE ROAD AND PUSHED THE GEAR SHIFT INTO NEUTRAL AND TURNED OFF THE CAR. THE SERVICE MANAGER AND MECHANIC EXPLAINED THAT BY DESIGN IF THE BRAKE SWITCH FAILS THEN THE CRUISE CONTROL WON'T TURN OFF AS IT'S SUPPOSED TO WHEN YOU APPLY THE BRAKE PEDAL. FURTHERMORE THE CRUISE CONTROL SENSES THAT THE CAR IS SLOWING DOWN BECAUSE I WAS BRAKING SO IT INCREASES THE ACCELERATION TO GET THE CAR BACK UP TO THE CRUISE CONTROL SET SPEED. THE MORE YOU BRAKE THE MORE THE CRUISE CONTROL WILL FORCE THE CAR TO ACCELERATE. THE MECHANIC SAID THE SOLUTION WAS TO MANUALLY TURN OFF THE CRUISE CONTROL, BUT I WAS SO PANICKED THAT THOUGHT NEVER OCCURRED TO ME. IF IT WAS MY WIFE OR 16 YEAR OLD SON DRIVING THEY WOULD HAVE CRASHED THE CAR. THE SERVICE MANAGER ACKNOWLEDGED THAT MERCEDES BENZ IS AWARE OF THE PROBLEM. THEY FIXED MY BRAKE SWITCH FOR FREE AFTER HEARING MY SCARY STORY. I TOLD THEM I THOUGHT THEY SHOULD HAVE A RECALL TO FIX THIS DESIGN PROBLEM. THE DESIGN SHOULD INCLUDE A SECONDARY BRAKE SWITCH OR SOME TYPE OF AUTOMATIC CRUISE CONTROL TURN OFF FUNCTION. *TR
NHTSA ODI #10353216
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.
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