The 2007 HUMMER H3 has no open NHTSA recalls. Owners report 5 recurring issue clusters, led by “Hood louver vent loosening or detachment.” Know which Hummer you have, because they share a name and nothing else. The H2 and H3 are GM trucks underneath: oil by the Oil Life Monitor with a 12-month cap, plugs at 100,000 miles, Dex-Cool on a 5-year clock, and driveline fluids around 50,000 under hard use. The H1 is a demilitarized truck with a schedule to match: fluids and inspections on a repeating 12,000-mile cycle, fuel filter elements every 6,000 miles on the diesel, grease fittings every 3,000, plus two systems no other truck on this site has, geared hubs at each wheel and the central tire inflation system, both of which need a specialist who knows them. If you off-road any of these, run the severe schedule without debate.
No open recalls on file. NHTSA lists no unrepaired safety recalls for this year, make and model. A recall can be issued at any time, and a specific car can still have one open — check yours by VIN at nhtsa.gov/recalls.
What drivers and federal regulators have officially reported about the 2007 HUMMER H3.
STRUCTURE
10 NHTSA complaints · 2015-04 → 2023-06
“Louver hood vent cover flew off on the highway as I was driving”
“The contact owns a 2007 Hummer H3. The contact stated that while driving at various speeds, the hood louvers loosened without warning. Upon investigation, the contact discovered NHTSA Campaign Number: 10V179000 (Structure) which he linked to the failure”
“HOOD VENT IS LOOSE&COMING OFF”
ELECTRICAL SYSTEM
42 NHTSA complaints · 2012-09 → 2026-07
“The contact owned a 2007 Hummer H3. The contact stated that while the vehicle was parked, the AC was turned on, and the contact became aware of smoke entering the cabin of the vehicle. The smoke was coming from the front passenger's side underneath the dashboard”
“MY HEATER, DEFROSTER FAN QUIT WORKING. ALSO SMELLED A BURNING SMELL. I DISCONNECTED THE PLUGS TO THE BLOWER MOTOR AND DISCOVERED THAT ONE OF THE WIRES AND PLUG WAS BURNT AND MELTED”
“TL* THE CONTACT OWNS A 2007 HUMMER H3. THE CONTACT STATED THAT THE BLOWER MOTOR FAILED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 15V421000 (VISIBILITY) HOWEVER, THE PART TO DO THE RECALL REPAIR WAS UNAVAILABLE”
ELECTRICAL SYSTEM
29 NHTSA complaints · 2012-08 → 2022-09
“PASSLOCK PROBLEM (GM SECURITY) CAUSING THE VEHICLE TO STALL AT ANY SPEED WITH NO POWER BRAKES OR STEERING TILL YOU COAST TO THE SHOULDER AND TRY IT AGAIN MIGHT GO 1 MILE MIGHT GO 100 MILES BEFORE IT HAPPENS AGAIN, PASSLOCK LIGHT FLASHES WHEN VEHICLE STALLS, TONS OF PEOPLE WITH”
“REPEAT NO START DUE TO FAULTY SECURITY SYSTEM. HAD TO GO TO EMERGENCY ROOM AND COULD NOT GO DUE TO FAULTY SECURITY OR "PASS LOCK" ISSUE AND THIS IS APPARENTLY KNOWN. WHY IS THERE NO RECALL, THIS IS A SAFETY ISSUE!”
“IGNITION SWITCH STAYS ON WITH KEY OFF AND OUT AND ALARM GOES OFF SOMETIMES JUST SITTING AND BATTERY GOES DEAD”
ENGINE
23 NHTSA complaints · 2014-04 → 2021-09
“TL* THE CONTACT OWNS A 2007 HUMMER H3. WHILE DRIVING APPROXIMATELY 40 MPH, THE VEHICLE SHOOK VIOLENTLY AND STALLED WITHOUT WARNING. THE VEHICLE COULD NOT BE RESTARTED”
“MY HUMMER STALLS AND DIES AT VARIOUS TIMES. THIS IS DANGEROUS AND KNOW ONE CAN SEEM TO TELL ME WHY IT DIES WHILE DRIVING. I TAKE GREAT CARE OF MY TRUCK AND ME I HAVE METAL SHAVINGS IN OIL. DYING IN AN INTERSECTION WITH CHILDREN IS DANGEROUS. THIS NEEDS TO BE ADDRESSED”
“DRIVING DOWN THE ROAD AND IT STOP AND IT WOULD NOT START ENGINE LOCK UP”
AIR BAGS
13 NHTSA complaints · 2013-09 → 2019-08
“TL* THE CONTACT OWNS A 2007 HUMMER H3. WHILE DRIVING APPROXIMATELY 15 MPH, THE FRONT DRIVER'S AIR BAG DEPLOYED WITHOUT IMPACT OR WARNING. THERE WERE NO INJURIES. THE CONTACT DROVE THE VEHICLE TO HIS RESIDENCE”
“TWICE NOW THE AIRBAGS HAVE DEPLOYED BY HITTING A POTHOLE OR A ROUGH SPOT IN THE ROAD. DURING THE INVESTIGATION OF THE 2ND DEPLOYMENT, GM DENIED THERE IS A PROBLEM EVEN THOUGH THEIR REPORT STATES THAT THE SENSOR SENSED A ROLLOVER EVEN THOUGH ALL FOUR WHEELS WERE ON THE GROUND”
“I WAS LEAVING OUT OF MY SUBDIVISION AND MY SIDE CURTAIN SIDE CURTAIN AIR BAGS DEPLOYED (BOTH SIDES) WITHOUT ANY WARNING. LUCKILY, I WAS ABLE TO DRIVE THE VEHICLE BACK TO HOUSE. GM IS NOT GIVING ME THE NECESSARY INFORMATION TO RESOLVE THIS ISSUE”
Issues on other model years
Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 20, 2026. Investigation data refreshed Sep 1, 2026.
We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.
Critical for safety and preventing major damage
H2/H3: per the Oil Life Monitor, at least annually. H1 diesels: every 3,000 to 5,000 miles depending on use, and the 6.5 turbodiesel earns the short end. Chassis grease with every change on H1s.
Estimated cost — typical U.S. ranges
Dealer
~$120–$160
Shop
~$85–$115
DIY
~$25–$55
Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.
Rotate with oil services; these are heavy trucks that eat front tires. H1: verify CTIS inflate and deflate function at every service.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Often free at the shop where you bought the tires — worth asking before paying.
At every service. H2 brakes work hard against 6,600 pounds; budget accordingly.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.
GM published no interval in this era; every 2 to 3 years is sound practice, sooner with water crossings.
Estimated cost — typical U.S. ranges
Dealer
~$180–$200
Shop
~$125–$140
DIY
~$10–$25
DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.
Keeps your vehicle running smoothly and efficiently
The H1's tune-up item: drain and check at every service, replace the element every 6,000 miles. Diesel injection systems die from dirty fuel, not age.
Estimated cost — typical U.S. ranges
Dealer
~$195–$250
Shop
~$135–$175
DIY
~$20–$60
On many modern cars the filter lives inside the fuel tank and is lifetime — verify before paying for a 'service'.
100,000 miles with the factory iridium plugs on both the H3's five-cylinder and the V8s. The H1 diesel has none.
Estimated cost — typical U.S. ranges
Dealer
~$285–$390
Shop
~$200–$275
DIY
~$25–$100
Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.
H2/H3: inspect at oil changes, replace around 50,000 miles, far sooner in dust. H1: clean or replace every 6,000 miles; it lives in dust.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
5-minute job on most cars; the airbox lid usually has clips, no tools needed.
50,000 miles severe, 100,000 normal on H2/H3, and almost every Hummer qualifies as severe. H1: transmission serviced on the 12,000-mile cycle.
Estimated cost — typical U.S. ranges
Dealer
~$330–$500
Shop
~$235–$355
DIY
~$60–$180
Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.
Every 50,000 miles under severe or off-road use on H2/H3 (Dexron VI per GM's updated spec); on the H1's 12,000-mile cycle.
Estimated cost — typical U.S. ranges
Dealer
~$105–$140
Shop
~$75–$100
DIY
~$15–$40
AWD/4WD vehicles only. Easy drain-and-fill on most platforms.
Front and rear diffs around 50,000 miles with off-road or towing use. H1s add geared hubs at each corner, checked at every service; hub fluid is an H1 specialist item that must not be skipped.
Estimated cost — typical U.S. ranges
Dealer
~$150–$195
Shop
~$105–$135
DIY
~$20–$50
Drain plug + fill plug — straightforward DIY. AWD vehicles have two; budget for both.
Extends the life of your vehicle and improves comfort
H2/H3: Dex-Cool, 5 years or 150,000 miles. H1: the AM General schedule flushes far more often; follow it.
Estimated cost — typical U.S. ranges
Dealer
~$285–$330
Shop
~$200–$235
DIY
~$25–$60
Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.
Inspected at services, replaced on condition; every 6,000-mile check on the H1 schedule.
Estimated cost — typical U.S. ranges
Dealer
~$195–$235
Shop
~$135–$165
DIY
~$20–$50
DIY-friendly if you can reach the tensioner. Inspect for cracks rather than swap on a strict mileage interval.
Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.
How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.
This maintenance schedule for the 2007 HUMMER H3 reflects Hummer's published service intervals and the GM Oil Life Monitor (H2/H3) system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.