There are 7 owner-reported brakes complaints for the 2007 Hummer H3in NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
WHEN HAVING BRAKE WORK DONE ON MY VEHICLE IT WAS FOUND TO HAVE BULGES IN 3 OF THE 4 BRAKE LINES.
WHILE DRIVING AT 65 MILES PER HOUR THE VEHICLE DASH LIT UP ALL SERVICE LIGHTS THE VEHICLE WENT INTO REDUCED POWER MODE NOT ALLOWING THE VEHICLE TO EXCEED 40 MPH AND ABS SENSORS CAME ON STAYING TRACTION FAIL, ABS FAIL, BEGAN TO STUTTER AND STALL. TOOK TO SHOP. VEHICLE RUNNING CODES FOR SPARK PLUGS, REPLACED SPARK PLUGS. FEW WEEKS LATER DID IT AGAIN, THIS TIME SAYING THROTTLE BODY. REPLACED IT, A MONTH LATER DID IT AGAIN, EACH TIME IN MAJOR TRAFFIC HAVING TO PULL OFF ROADWAY TO AVOID AN ACCIDENT. THIS TIME SAYS MISFIRING, THROTTLE BODY, ABS,TPMS, THERMOSTAT, ETC. TAKE IT TO HAVE COMPRESSION TEST RUN AND SYSTEM SAYS CYLINDER FAILURE. DO RESEARCH ON ISSUE AND FIND THAT THERE ARE HUNDREDS OF COMPLAINTS ABOUT THIS ONLINE HAVING CAUSED ACCIDENTS AND THOUSAND OF DOLLARS SPENT BY CONSUMERS AFTER HAVING ACCIDENTS BUT NO KNOWN FATALITY SO GM WILL NO RECALL OR HONOR THE ISSUE REPAIRS. ALMOST ALL OF THEM HAPPENING AT 100K MILES. *TR
TL* THE CONTACT OWNS A 2007 HUMMER H3. THE CONTACT STATED THAT THE VEHICLE WAS TURNED OFF AND THE BRAKES WERE ENGAGED WHEN THE VEHICLE BEGAN TO ROLL AWAY IN REVERSE. THE CONTACT WAS ABLE TO STOP THE FAILURE. THE VEHICLE WAS TAKEN TO THE DEALER AND THE MANUFACTURER WAS MADE AWARE OF THE ISSUE BUT THE VEHICLE WAS NOT REPAIRED. THE FAILURE AND CURRENT MILEAGES WERE 54,000.
TL* THE CONTACT OWNS A 2007 HUMMER H3. HIS REAR BRAKE DRUM CAUGHT ON FIRE . THE REAR BRAKE DRUM WAS LOCATED UNDER THE FUEL TANK. THE VEHICLE WAS TAKEN TO THE DEALER FOR INSPECTION. HE WAS ADVISED THEY WOULD NOT REPAIR THE VEHICLE UNDER WARRANTY BECAUSE HE MADE HIS TIRES SPIN TOO MUCH IN THE SNOW. HOWEVER WHILE IN SNOW HIS VEHICLE BECAME STUCK AND HE WAS TRYING TO GET OUT. GENERAL MOTORS WAS ALSO CONTACTED AND STATED THEY REVIEWED HIS CLAIM BUT WOULD NOT COVER THE REPAIR. THE FAILURE MILEAGE WAS 31,000. THE VIN WAS UNKNOWN.
TL*THE CONTACT OWNS A 2007 HUMMER H3. THE CONTACTS HUSBAND STATED THAT THE DISTANCE BETWEEN THE BRAKE AND ACCELERATOR PEDALS IS TOO NARROW AND HIS SHOES GET STUCK IN THE SPACE. THE CONTACT SPOKE WITH THE DEALER AND THEY STATED THAT THEY WERE AWARE OF THE FAILURE. THE CURRENT MILEAGE WAS 200 AND FAILURE MILEAGE WAS 149. UPDATED 02-01-08 *BF THE CONSUMER STATED SHE HAS LOCATED THE DEFECT. THE CONSUMER STATED THE DEFECT WAS THE CARPET THAT WAS INTERFERING WITH THE BRAKE, SO PROBLEM SOLVED. UPDATED 02/01/08 *TR
2007 HUMMER H3 HAS VIBRATION IN THE BRAKE AND ACCELERATOR PEDAL. THE CONSUMER ALSO STATED THE VEHICLE OVERHEATED WHILE DRIVING IN TRAFFIC. *JB THE CONSUMER STATED SHE CONTINUES TO FEEL A KICK IN THE PEDAL. THE DEALER WAS UNABLE TO FIX THE PROBLEMS ON THE VEHICLE. UPDATED 01/18/11. *JB
TL*- THE CONTACT OWNS A 2007 HUMMER H3 STATED THAT BETWEEN THE GAS PEDAL AND BRAKE THERE IS NOT ENOUGH ROOM FOR HIM TO NAVIGATE THE TWO PEDALS BECAUSE WHEN HE PUT HIS FOOT ON THE GAS PEDAL IT CAUGHT THE BRAKE PEDAL AND IT CAUSES HIM DIFFICULTY IN OPERATE THE VEHICLE PROPERLY. THE CURRENT AND FAILURE MILEAGE WERE BOTH 6,000 MILES.
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