NHTSA owner reports · September 18, 2026 snapshot.
What owners actually said
115 reports90,000 miles · Sep 24, 2013
Seat Belts
THE PLASTIC THAT HOLDS THE LATCH BROKE. WE NORMALLY HAVE A CHILD SEAT BUCKLED INTO THAT BELT. BUT WE WERE ON A TRIP, AND I WAS THE ONE USING THIS SEAT BELT. I COULD NOT LATCH IT, AND FOUND THAT A CHUNK OF THE PLASTIC HAD BROKEN AWAY FROM THE BELT AND WOULD NOT LATCH. MERCEDES AND MY EXTENDED PROTECTION PLAN WILL NOT REPLACE …
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THE PLASTIC THAT HOLDS THE LATCH BROKE. WE NORMALLY HAVE A CHILD SEAT BUCKLED INTO THAT BELT. BUT WE WERE ON A TRIP, AND I WAS THE ONE USING THIS SEAT BELT. I COULD NOT LATCH IT, AND FOUND THAT A CHUNK OF THE PLASTIC HAD BROKEN AWAY FROM THE BELT AND WOULD NOT LATCH. MERCEDES AND MY EXTENDED PROTECTION PLAN WILL NOT REPLACE IT WITHOUT A COST. OF APPRX 170.00 I HAVE NEVER HAD AN ISSUE WITH A SAFETY DEVICE IN ANY VEHICLE THAT I HAVE OWNED, AND I BELIEVE THAT A CAR THAT COSTS OVER 80,000.00 WOULD WANT TO KNOW WHY IT HAS FAILED. I AM GRATEFUL THAT MY GRAND CHILD WAS NOT BUCKLED INTO THIS BELT! *JS
NHTSA ODI #10545209
82,500 miles · Sep 12, 2013
Power Train
WHILE DRIVING ON HIGHWAY, TRANSMISSION SUDDENLY LOST POWER AND WENT INTO LIMP MODE (NEUTRAL) EVEN THOUGH THE CAR WAS IN D AND THE SAME THING HAPPENED ON STOP LIGHT, CAR LOST THE POWER AND I HAD TO ACCELERATE CAR HARD TO MAKE IT MOVE AND STILL DIDN'T MOVE FINALLY I HAD TO RESTART IT, RESTARTING THE CAR SOLVED THE PROBLEM BUT IT W…
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WHILE DRIVING ON HIGHWAY, TRANSMISSION SUDDENLY LOST POWER AND WENT INTO LIMP MODE (NEUTRAL) EVEN THOUGH THE CAR WAS IN D AND THE SAME THING HAPPENED ON STOP LIGHT, CAR LOST THE POWER AND I HAD TO ACCELERATE CAR HARD TO MAKE IT MOVE AND STILL DIDN'T MOVE FINALLY I HAD TO RESTART IT, RESTARTING THE CAR SOLVED THE PROBLEM BUT IT WOULD COME BACK ONCE YOU ARE ON HIGHWAY SPEED, THIS CAN SERIOUSLY CAUSE THE ACCIDENT AS YOU CANT CHANGE THE LANE AS YOUR VEHICLE LOSSES THE POWER AND IT SLOWS DOWN AND COUPLE OF TIMES THE TRANSMISSION MADE A LOUD BOOM SOUND CAUSING THE VEHICLE SPEED TO SLOWED DOWN IN VERY SHORT SPAN OF TIME, AND IF THE DRIVER BEHIND MY CAR HAS SHORT DISTANCE HE\SHE MIGHT END UP HITTING BACK OF THE VEHICLE, THERE WAS A SILENT MERCEDES SERVICE BULLETIN S-B-27.00/120 RAISED BY MERCEDES DATE APR 8 2011 FOR CHANGING THE VALVE BODY CONDUCTOR PLATE IN 7 SPEED TRANSMISSION, WHERE AS IT SHOULD HAVE BEEN A RECALL FOR 2007-2008 MODEL GL450 BUT MERCEDES GOT AWAY WITH IT. THIS IS REALLY A SAFETY CONCERN AND HIDDEN TRUTH FROM CUSTOMERS. I WOULD REQUEST YOU TO PLEASE LOOK INTO THIS ISSUE AND THERE ARE TONS OF OTHER PEOPLE ON FORUMS WHO HAD THE SAME ISSUES FOR THESE 2 YEAR MODELS SOME GOT THE FREE FIX AS THEY WAS UNDER WARRANT AND SOME HAD TO PAY OUT OF POCKET, THERE WERE FEW INSTANCES WHERE THIS CONDUCTOR PLATE FAILED WITHIN 5-45000 MILES. *TR
NHTSA ODI #10543367
83,000 miles · Jul 3, 2013
Electrical SystemSteering
MY MB GL450 2007 CARS HORN STARTED TO RANDOMLY GO OFF FOR NO REASON MULTIPLE TIMES. THIS HAPPENED THREE TIMES, ONCE WHEN I STARTED THE CAR IN GROCERY STORE PARKING LOT, SECOND TIME WHILE I WAS DRIVING AND SCARED OTHER MOTORIST TO PULL OVER. ONLY WAY I COULD MAKE IT STOP WAS TO PULL OVER AND TURN OFF THE CAR. WHEN I TURNED O…
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MY MB GL450 2007 CARS HORN STARTED TO RANDOMLY GO OFF FOR NO REASON MULTIPLE TIMES. THIS HAPPENED THREE TIMES, ONCE WHEN I STARTED THE CAR IN GROCERY STORE PARKING LOT, SECOND TIME WHILE I WAS DRIVING AND SCARED OTHER MOTORIST TO PULL OVER. ONLY WAY I COULD MAKE IT STOP WAS TO PULL OVER AND TURN OFF THE CAR. WHEN I TURNED ON THE CAR THE HORN STARTED AGAIN, TURNED OFF, TURNED ON DROVE TO REPAIR SHOP. REPAIR SHOP TOLD ME THE SPRING FOR THE HORN HAD WARN OUT AND THE ELECTRONIC CONSOLE IN THE STEERING WHEEL WAS SHOT. TOLD ME YOU CAN'T ORDER THE PART ANYMORE BECAUSE IT WAS DISCONTINUED, SO, WE HAVE TO ORDER A WHOLE NEW STEERING WHEEL FOR $1,200 PLUS $600 IN LABOR. *TR
NHTSA ODI #10523119
80,000 miles · Jun 3, 2013
Power Train
I WAS DRIVING AT NIGHT ON A LOCAL ROAD WHEN THE TRANSMISSION LOCKED UP AND WOULD NOT SHIFT UP A GEAR. I IMMEDIATELY GOT INTO THE NEAREST PLAZA AND PUT THE CAR IN PARK AND TURNED OFF THE ENGINE. I THEN RESTARTED THE CAR AND THE TRANSMISSION WAS SHIFTING CORRECTLY AND WAS NOT LOCKING INTO A GEAR. THIS HAS HAPPENED TO ME TWICE ALRE…
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I WAS DRIVING AT NIGHT ON A LOCAL ROAD WHEN THE TRANSMISSION LOCKED UP AND WOULD NOT SHIFT UP A GEAR. I IMMEDIATELY GOT INTO THE NEAREST PLAZA AND PUT THE CAR IN PARK AND TURNED OFF THE ENGINE. I THEN RESTARTED THE CAR AND THE TRANSMISSION WAS SHIFTING CORRECTLY AND WAS NOT LOCKING INTO A GEAR. THIS HAS HAPPENED TO ME TWICE ALREADY. IT IS A MAJOR SAFETY CONCERN AS I COULD HAVE BEEN IN AN ACCIDENT WITH THE CAR BEHIND ME. I COULD HAVE ALSO DAMAGED INTERNAL COMPONENTS IN MY SUV. *TR
NHTSA ODI #10514907
70,000 miles · Jun 3, 2013
EquipmentStructure
TL* THE CONTACT OWNS A 2007 MERCEDES BENZ GL450. THE CONTACT STATED THAT THE PLASTIC JACK HOLDER HAD FRACTURED AND CAUSED THE VEHICLE TO DROP TO THE GROUND WHILE IT WAS ELEVATED. THE DEALER WAS MADE AWARE OF THE FAILURE. THE FAILURE AND CURRENT MILEAGE WAS 70,000. UPDATED 09/18/13*LJ THE DEALER AGREED THE DESIGN WAS FLAWED, …
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TL* THE CONTACT OWNS A 2007 MERCEDES BENZ GL450. THE CONTACT STATED THAT THE PLASTIC JACK HOLDER HAD FRACTURED AND CAUSED THE VEHICLE TO DROP TO THE GROUND WHILE IT WAS ELEVATED. THE DEALER WAS MADE AWARE OF THE FAILURE. THE FAILURE AND CURRENT MILEAGE WAS 70,000. UPDATED 09/18/13*LJ THE DEALER AGREED THE DESIGN WAS FLAWED, BUT MERCEDES WAS NOT HAD NOT ISSUED A RECALL.
NHTSA ODI #10514783
41,000 miles · May 27, 2013
Fuel/propulsion SystemVehicle Speed Control
VEHICLE WILL NOT CHANGE GEAR AND BECOME SLUGGISH WITH TERRIBLE FUEL CONSUMPTION. TRIED FUEL TREATMENT, PROBLEM GETS BETTER THEN RETURN. THE PROBLEM IS INTERMITTENT. *TR
NHTSA ODI #10513629
80,000 miles · May 14, 2013
Power TrainCrashInjury
DAY BEFORE THE INCIDENT, CAR WOULD SUDDENLY STICK IN GEAR, NOT SHIFT UP OR DOWN OTHER THAN AFTER TURNING IT OF. RESEARCHED THIS; SEEMS TO BE A COMMON PROBLEM WITH THIS MODEL. HAD NO TIME TO GET IT FIXED THAT DAY, NEXT DAY GOT INVOLVED IN A SIDE IMPACT ACCIDENT (OTHER DRIVER NEGLECTED STOP SIGN) WANTED TO SPEED UP TO AVOID COLLI…
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DAY BEFORE THE INCIDENT, CAR WOULD SUDDENLY STICK IN GEAR, NOT SHIFT UP OR DOWN OTHER THAN AFTER TURNING IT OF. RESEARCHED THIS; SEEMS TO BE A COMMON PROBLEM WITH THIS MODEL. HAD NO TIME TO GET IT FIXED THAT DAY, NEXT DAY GOT INVOLVED IN A SIDE IMPACT ACCIDENT (OTHER DRIVER NEGLECTED STOP SIGN) WANTED TO SPEED UP TO AVOID COLLISION, BUT CAR DID NOT SHIFT DOWN OR ACCELERATE. COULD NOT AVOID COLLISION. AFTER BODY WORK, CAR WOULD STILL HAVE SAME SHIFTING ISSUE. DEALER FOUND OUT WAS FAILING CONDUCTOR PLATE AND VALVE BODY OF THE TRANSMISSION.
NHTSA ODI #10512165
88,000 miles · Apr 25, 2013
SeatsInjury
I STARTED MY CAR IN THE MORNING AND TURNED ON MY HEATED SEATS AS THE SEATS BEGIN TO WARM UP I STARTED TO SMELL SMOKE I WAS ITCHING ON MY BACK IN THE AREA OF MY FAR ON MY LEFT SIDE AND I NOTICED THAT THE SEAT WAS BURNING I IMMEDIATELY TURNED OFF MY HEATED SEATS AND THEN NOTICED THAT I WAS STUCK TO THE SEAT BECAUSE THE SEAT AT CAU…
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I STARTED MY CAR IN THE MORNING AND TURNED ON MY HEATED SEATS AS THE SEATS BEGIN TO WARM UP I STARTED TO SMELL SMOKE I WAS ITCHING ON MY BACK IN THE AREA OF MY FAR ON MY LEFT SIDE AND I NOTICED THAT THE SEAT WAS BURNING I IMMEDIATELY TURNED OFF MY HEATED SEATS AND THEN NOTICED THAT I WAS STUCK TO THE SEAT BECAUSE THE SEAT AT CAUGHT FIRE THERE WAS AN APPARENT HOLE IN THE LEATHER ON THE LEFT RIGHT SIDE OF MY DRIVER SEAT WHERE IT WAS BURNING. THIS WAS SCARY AND ALARMING BECAUSE I DIDN'T KNOW IF IT WOULD CONTINUE TO IGNITE. *TR
NHTSA ODI #10509622
106,366 miles · Feb 22, 2013
SeatsFire
TL* THE CONTACT OWNS A 2007 MERCEDES BENZ GL450. THE CONTACT STATED THAT AFTER STARTING THE IGNITION, THE FRONT DRIVER'S SIDE HEATED SEAT WAS ACTIVATED AND SUDDENLY THERE WAS A BURNING ODOR WITH SMOKE EMITTING FROM THE SEAT. A SMALL FLAME WAS ALSO VISIBLE. THE CONTACT PERSONALLY EXTINGUISHED THE FIRE. THE VEHICLE HAD NOT BEEN DI…
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TL* THE CONTACT OWNS A 2007 MERCEDES BENZ GL450. THE CONTACT STATED THAT AFTER STARTING THE IGNITION, THE FRONT DRIVER'S SIDE HEATED SEAT WAS ACTIVATED AND SUDDENLY THERE WAS A BURNING ODOR WITH SMOKE EMITTING FROM THE SEAT. A SMALL FLAME WAS ALSO VISIBLE. THE CONTACT PERSONALLY EXTINGUISHED THE FIRE. THE VEHICLE HAD NOT BEEN DIAGNOSED. THE MANUFACTURER WAS NOT NOTIFIED OF THE PROBLEM. THE APPROXIMATE FAILURE MILEAGE WAS 106,366. *TR
NHTSA ODI #10499649
46,200 miles · Feb 5, 2013
Power Train
2007 GL 450 DOES NOT SHIFT, PULLED OUT IN TRAFFIC AND ALMOST GOT HIT, WITH SMALL MOVEMENT 5MPH TOP SPEED. STOP AT LIGHT ON HILL AND TRANSMISSION WAS STUCK IN NEUTRAL. HAD TO SHUT OFF ENGINE TO RE ENGAGE TOOK TO DEALER AND THEY SAID IT WAS THE CONDUCTOR PLATE SENSOR. SAFETY ISSUE? I THINK SO. *TR
NHTSA ODI #10496456