NHTSA owner reports · September 18, 2026 snapshot.
Steering complaints
24 reportsClear category filterMileage unknown · Jun 20, 2017
Electrical SystemSteering
TL* THE CONTACT OWNS A 2002 MERCEDES BENZ ML320. THE CONTACT STATED THAT THE BAS AND ESP WARNING INDICATORS ILLUMINATED. IN ADDITION, THE CONTACT EXPERIENCED EXTREME DIFFICULTY TURNING LEFT AND RIGHT AND HAD TO RESTART THE VEHICLE SEVERAL TIMES DUE TO THE FAILURES. THE UNKNOWN DEALER WAS NOTIFIED OF THE FAILURE. THE MANUFACTURER…
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TL* THE CONTACT OWNS A 2002 MERCEDES BENZ ML320. THE CONTACT STATED THAT THE BAS AND ESP WARNING INDICATORS ILLUMINATED. IN ADDITION, THE CONTACT EXPERIENCED EXTREME DIFFICULTY TURNING LEFT AND RIGHT AND HAD TO RESTART THE VEHICLE SEVERAL TIMES DUE TO THE FAILURES. THE UNKNOWN DEALER WAS NOTIFIED OF THE FAILURE. THE MANUFACTURER WAS ALSO NOTIFIED. THE FAILURE MILEAGE WAS NOT AVAILABLE.
NHTSA ODI #11000157
200,000 miles · Mar 16, 2017
EngineSteering
I WAS PULLING AWAY FROM THE CURB, STEERING WHEEL STARTED MAKING WHINING NOISES AND HARDER TO TURN. I CONTINUED ON CITY STREETS THEN TO A FREEWAY WHERE MY CAR BEGAN TO OVERHEAT. I PULLED OVER AT A GAS STATION OPENED THE HOOD AND COULD SEE FLUID ALL OVER RIGHT LOWER DRIVER SIDE. IT SEEMED TO BE COMING FROM A HOSE BY THE POWER STEE…
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I WAS PULLING AWAY FROM THE CURB, STEERING WHEEL STARTED MAKING WHINING NOISES AND HARDER TO TURN. I CONTINUED ON CITY STREETS THEN TO A FREEWAY WHERE MY CAR BEGAN TO OVERHEAT. I PULLED OVER AT A GAS STATION OPENED THE HOOD AND COULD SEE FLUID ALL OVER RIGHT LOWER DRIVER SIDE. IT SEEMED TO BE COMING FROM A HOSE BY THE POWER STEERING CAP AND THE RIGHT SIDE OF THE RADIATOR. UNDER THE CAR SAME SPOT RIGHT PASSENGER SIDE I COULD SEE POWER STEERING AND RADIATOR COOLANT LEAKING FROM THAT AREA.
NHTSA ODI #10966233
180 miles · Jun 19, 2016
Electrical SystemElectronic Stability Control (esc)Steering
I HAVE A 2002 ML320, THE RADIO IS OUT AND THE HOLE CLAMP USED TO SECURE THE POWER STEERING FLUID DOES NOT PROVIDE SUFFICIENT CLAMPING CAUSING A LEAK, ESP/BAS STAYS ON CAUSING LOW TRACTION AND THE DOOR LOCK. THESE ITEMS WERE RECALLED ON THE M-CLASS 320, WHAT HAPPENED TO THES RECALLS.
NHTSA ODI #10875060
154,000 miles · Jan 19, 2016
Steering
TL* THE CONTACT OWNS A 2002 MERCEDES-BENZ ML320. AFTER THE VEHICLE WAS STARTED, THE CONTACT HEARD AN ABNORMAL SOUND UNDER THE HOOD OF THE VEHICLE. THE CONTACT OPENED THE HOOD AND DISCOVERED THAT THE POWER STEERING HOSE WAS FRACTURED AND FLUID WAS LEAKING. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE CONTACT MENTIONED THAT THE …
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TL* THE CONTACT OWNS A 2002 MERCEDES-BENZ ML320. AFTER THE VEHICLE WAS STARTED, THE CONTACT HEARD AN ABNORMAL SOUND UNDER THE HOOD OF THE VEHICLE. THE CONTACT OPENED THE HOOD AND DISCOVERED THAT THE POWER STEERING HOSE WAS FRACTURED AND FLUID WAS LEAKING. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE CONTACT MENTIONED THAT THE VEHICLE WAS PREVIOUSLY REPAIRED UNDER MANUFACTURER SAFETY CAMPAIGN NUMBER: 2003-040005. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 154,000.
NHTSA ODI #10820893
143,340 miles · Nov 22, 2014
Steering
I BOUGHT THIS CAR YESTERDAY FROM AN INDIVIDUAL OFF CRAIGSLIST AND THE POWER STEERING HAS GONE OUT 5 TIMES. SO FAR ONLY AT VERY LOW SPEEDS, BUT I HAVE LOOKED ONLINE AND SEEN NUMBERS COMPLAINTS WITH POWER STEERING FAILURE AT FASTER SPEEDS TOO. VERY UNSETTLING. THERE WERE A COUPLE OF RECALLS REGARDING THE CLAMPS AND HOSES, BUT U…
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I BOUGHT THIS CAR YESTERDAY FROM AN INDIVIDUAL OFF CRAIGSLIST AND THE POWER STEERING HAS GONE OUT 5 TIMES. SO FAR ONLY AT VERY LOW SPEEDS, BUT I HAVE LOOKED ONLINE AND SEEN NUMBERS COMPLAINTS WITH POWER STEERING FAILURE AT FASTER SPEEDS TOO. VERY UNSETTLING. THERE WERE A COUPLE OF RECALLS REGARDING THE CLAMPS AND HOSES, BUT UPON RESEARCH I FOUND THAT Y CAR HAS NO OPEN CAMPAIGNS. I GUESS THAT MEANS THEY FIXED THE PROBLEM. THERE IS AN OBVIOUS PROBLEM STILL AND I NEED IT FIXED OR I NEED A NEW CAR. THIS IS NOT SAFE. *TR
NHTSA ODI #10660267
149,000 miles · May 13, 2014
Electronic Stability Control (esc)Service BrakesSteering
WHILE DRIVING ON THE HIGHWAY AT 60MPH THE VEHICLE STARTED SHAKING VIOLENTLY. THE BRAKES STARTED ENGAGING ON THEIR OWN PULLING THE CAR TO THE LEFT AND RIGHT AND NEARLY BRINGING THE CAR TO A SUDDEN STOP. IT TOOK A LOT OF EFFORT TO KEEP THE VEHICLE FROM PULLING INTO THE OTHER LANES AND CAUSING AN ACCIDENT. THE BAS/ESP LIGHT CAME ON…
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WHILE DRIVING ON THE HIGHWAY AT 60MPH THE VEHICLE STARTED SHAKING VIOLENTLY. THE BRAKES STARTED ENGAGING ON THEIR OWN PULLING THE CAR TO THE LEFT AND RIGHT AND NEARLY BRINGING THE CAR TO A SUDDEN STOP. IT TOOK A LOT OF EFFORT TO KEEP THE VEHICLE FROM PULLING INTO THE OTHER LANES AND CAUSING AN ACCIDENT. THE BAS/ESP LIGHT CAME ON THE DASH AND HAS STAYED ON NOW. THIS ALL LASTED FOR ABOUT 10 SECONDS. I WAS IN THE 3RD LANE OF A 4 LANE HIGHWAY DURING MODERATE TRAFFIC. I WAS ALMOST REAR ENDED BY TWO DIFFERENT VEHICLES. I HAVE BEEN RESEARCHING THIS ISSUE AND FOUND MANY OTHER DRIVERS WITH THE SAME THING. THIS IS A DANGEROUS DEFECT AND NEEDS TO BE ADDRESSED. IT DOESN'T TAKE MUCH FOR A SUDDEN CHANGE IN DIRECTION AND SPEED TO CAUSE A SEVERE ACCIDENT WHEN DRIVING ON THE HIGHWAY, AND KNOWING THAT THIS VEHICLE IS CAPABLE AND KNOW FOR DOING THIS MAKES IT VERY DANGEROUS. IT MAKES ME WONDER HOW MANY FATAL ACCIDENTS HAVE OCCURRED DUE TO THIS PROBLEM, BUT NO ONE KNEW BECAUSE IT WAS JUST ASSUMED THE TO BE DRIVER ERROR. *TR
NHTSA ODI #10587996
98,224 miles · Apr 22, 2013
Engine And Engine CoolingSteering
DRIVING HOME ON A LOCAL STREET AT ABOUT 30 MILES PER HOUR, APPROACHING INTERSECTION, TRYING TO TURN, ALL THE SUDDEN, STEERING WHEEL BECAME VERY HARD TO TURN, WITH NO ASSISTING POWER, CAR RUN OVER TO THE OTHER SIDE OF THE ROAD, ALMOST CRASH INTO CURB. IT IS VERY LUCKY, THERE IS NO INCOMING CARS, WOULD HAVE CRASH HEAD ON OTHERW…
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DRIVING HOME ON A LOCAL STREET AT ABOUT 30 MILES PER HOUR, APPROACHING INTERSECTION, TRYING TO TURN, ALL THE SUDDEN, STEERING WHEEL BECAME VERY HARD TO TURN, WITH NO ASSISTING POWER, CAR RUN OVER TO THE OTHER SIDE OF THE ROAD, ALMOST CRASH INTO CURB. IT IS VERY LUCKY, THERE IS NO INCOMING CARS, WOULD HAVE CRASH HEAD ON OTHERWISE. CAR TOWED TO DEALER, FOUND STEERING HOSE FROM RADIATOR TO STEERING RACK BROKEN OFF, STEERING FLUID SPLATTING ALL OVER ENGINE. DEALER STATED NO RECALL FOR STEERING HOSE COMING OUT OF RADIATOR, BUT THERE WAS RECALL ON STEERING HOSE COMING OUT OF PUMP. SO THIS DEFECT WAS NOT COVERED. I URGE NHTSA TO INVESTIGATE THIS DANGEROUS DEFECT IMMEDIATELY, AND ISSUE RECALL TO SAVE LIVES. *TR
NHTSA ODI #10509207
79,000 miles · Feb 10, 2013
Steering
POWER STEERING O RING AND HOSE RECALL. *TR
NHTSA ODI #10497609
129,000 miles · Nov 8, 2012
Electronic Stability Control (esc)Service BrakesSteering
FRONT PASSENGER SIDE WHEEL BRAKE ON IT'S OWN, PULLING ME OFF TO THE LEFT OF THE ROAD VEHICLE BRAKE (RIGHT SIDE) STAYED ENGAGED UNTIL VEHICLE SPEED WAS DOWN TO ABOUT 20 MPH. DEALER SAID A BAD YAW RATE SENSOR WAS THE PROBLEM. *TR
NHTSA ODI #10483756
Mileage unknown · Apr 1, 2010
Electrical SystemEngine And Engine CoolingLatches/locks/linkages
2002 MERCEDES-BENZ ML320. CONSUMER IS HAVING SOME WARRANTY REPAIR PROBLEMS WITH MERCEDES-BENZ. HE ALSO STATES THAT MERCEDES-BENZ IS REFUSING TO PAY FOR ANY RECALL REPAIRS. *KB THE CONSUMER STATED NOISES AND LACK OF POWER FROM THE VEHICLE WERE REPORTED TO THE DEALER. AN INDEPENDENT REPAIR SHOP FOUND DIRTY SOLID METAL RESIDUE IN…
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2002 MERCEDES-BENZ ML320. CONSUMER IS HAVING SOME WARRANTY REPAIR PROBLEMS WITH MERCEDES-BENZ. HE ALSO STATES THAT MERCEDES-BENZ IS REFUSING TO PAY FOR ANY RECALL REPAIRS. *KB THE CONSUMER STATED NOISES AND LACK OF POWER FROM THE VEHICLE WERE REPORTED TO THE DEALER. AN INDEPENDENT REPAIR SHOP FOUND DIRTY SOLID METAL RESIDUE IN THE TRANSMISSION FLUID, THERE WERE MISSING PARTS IN THE PLANETARY GEAR. THE CAUSE OF DAMAGE WAS FAULTY ASSEMBLY OF THE PINS/PLUGS IN THE GEARS, WHICH RESULTED IN THE PARTS BECOMING LOOSE AND BREAKING THE TEETH, WHICH CAUSED EXCESSIVE NOISE AND LOSS OF POWER, ULTIMATELY THE TRANSMISSION WAS REPLACED. THE POWER STEERING WAS LEAKING, THE BRAKE AND ENGINE LIGHTS ILLUMINATED SEVERAL TIMES, THE CATALYTIC CONVERTER WAS REPLACED, THE DOOR LOCKS HAD TO BE REPAIRED, THE BATTERY WAS REPLACED AND THE SWAY BAR LINK BUSHING WERE REPLACED AS WELL. *JB UPDATED 06/01/10.*JB UPDATED 06/04/10.*JB UPDATED 10/18/10*JB UPDATED 10/29/10*JB
NHTSA ODI #10323089
NHTSA investigations
1PE10050 · 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
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