There are 5 owner-reported fuel system complaints for the 2007 Hummer H3in NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
I have the well known issue with the passkey security system. Nothing is wrong mechanically with the car but the security system will not allow the truck to start, therefore leaving me randomly leaving me stranded. Much has been documented on this issue, yet gm has never done a recall.
I bought my 2007 hummerh3 used w/124,000 miles. I've had it a month and already had it in mechanic shop due to not starting. The mechanic thought it was a fuel relay and charged me 258.00 parts/labor/tow. Today 11-16-21, only a day after I got it back, it stopped on me again!! Just had it towed again. Just learning that this is a common problem! Is anything being done to rectify this problem?
WENT OUT TO START H3, TURNED KEY, CHECK ENGINE LIGHT CAME ON, THE BATTERY LIGHT CAME ON AND THE ANTI-THEFT SYSTEM LIGHT CAME ON. PASSLOCK/SECURITY SYSTEM INSIDE THE STEERING COLUMN IS BAD. CAR WON'T START. IS UNSAFE AND WILL STRAND OWNER WITHOUT WARNING BY NOT STARTING. GOES INTO SECURITY MODE. WAS TOLD TO WAIT 10 MIN AND TRY AGAIN. CAN'T TURN IT OFF AT GAS PUMP FOR FEAR OF IT LOCKING ME OUT AND NOT STARTING. I HAD THIS HAPPEN TO ME 4 TIMES IN ONE DAY. SO MANY COMPLAINTS ALL OVER THE INTERNET AND PEOPLE TRYING TO FIX THIS ISSUE. THERE IS EVEN A COMPANY SELLING A PART TO BYPASS THIS AND THE SECURITY SYSTEM WHICH AGAIN IS ANOTHER ISSUE. GM IS CLEARLY AWARE OF THIS ISSUE. THIS NEEDS TO BE RECALLED. STRANDING PEOPLE CAN BE VERY DANGEROUS. IF THERE IS AN EMERGENCY AND THE CAR WON'T START. ALL AROUND BAD BUSINESS BY GM FOR NOT ISSUING THIS RECALL. THIS HAS NOTHING TO DO WITH MILEAGE WHICH GM MANAGER SAID ON THE PHONE. THESE H3'S ARE KNOW FROM THIS FRESH OFF THE DEALERSHIP FLOOR. PEOPLE ARE BEING FORCED TO TAKE IT TO A DEALERSHIP FOR REPAIR AND REPLACING THE PART WHEN THE LABOR COSTS MORE THAN THE PART. SEEM LIKE A MONOPOLY FOR GM AND ITS DEALERSHIPS. I HAVE SEEN ANYWHERE FROM 1500-2000.00 TO INSTALL AND RECTIFY THIS BAD PART AT THE GM DEALERSHIPS.
WHEN I SLOW DOWN TO STOP AT A STOP SIGN OR SLOW DOWN TO TURN MY VEHICLE HAS BEEN DYING.
SMELLED RADIATOR FLUENT WHEN I PARKED INTO THE DRIVE WAY, POPPED THE HOOD AND SAW THAT THE LIQUID SPLASHED ALL OVER THE ENGINE AND PARTS AS WELL AS ON TOP OF THE PLASTIC FAN COVER, WHICH SEEMED ODD. COULDN'T FIND THE LEAK IN THE HOSE. LOOKED AT THE HUMMER FORUM THAT I'M A MEMBER OF AND LORD BEHOLD THERE WAS A BIG TOPIC OF RADIATORS CRACKING AND BREAKING IN THE SAME PLACES WITH THE 2007 MODELS. NO RECALL HAS BEEN ISSUED, SO NO RECALL HAS BEEN SUBMITTED. BUT IT'S A WELL KNOWN DEFECTIVE RADIATOR PROBLEM THAT GM KNOWS ABOUT BUT WON'T RECALL. SO THEY DECIDED TO MAKE A NEW RADIATOR THAT FIXES THE PROBLEM FOR THE 2007 HUMMERS. THE PROBLEM IS THE MIDDLE PIN THAT HOLDS THE RADIATOR RUBS THE NECK AND STARTS A CRACKED UNDER THE STYROFOAM, THUS THE RIGHT DRIVERS SIDE CRACKS IN THE SAME SPOT AS WELL ON THE PLASTIC SIDE. HUNDREDS OF H3 OWNERS HAD THIS HAPPEN TO THEM AND POST PICS AND WHAT NOT, BUT STILL NO RECALL. THIS PROBLEM IS ONGOING AND NOTHING IS BEING DONE. I HAVE SPOKE TO THE HUMMER CUSTOMER SERVICE AND THEY CONTACTED THE LOCAL GM AND THEY SCHEDULED MY SCHEDULED DATE TO TAKE MY H3 IN FEB 17 2014, @ 8 AM AT THE LOCAL GM DEALERSHIP AND HOPEFULLY THEY WILL FIX THIS ISSUE AND NOT CHARGED ME TO FIX DUE TO THE FACT THAT THEY KNOW THE PROBLEM AND HAVE DONE NOTHING TO FIX IT. BUT IT'S BEEN KNOW THAT THEY WILL NOT FIX THE RADIATOR AND THEY SAY IT'S DUE TO CLIMATE WHICH IS FALSE BECAUSE EVERY H3 OWNER HAS IT BREAK IN THE SAME PLACE, AND HAVE SUBMITTED COUNTLESS TICKETS. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026