NHTSA lists 2 safety recalls and 113 owner complaints for the 2008 Hummer H3. Most complaints involve electrical system (34) and engine (18). The EPA rates it 14–15 mpg combined.
General Motors LLC (GM) is recalling certain model year 2006-2010 Hummer H3 vehicles manufactured February 5, 2005, to May 24, 2010, and 2009-2010 Hummer H3T vehicles manufactured May 21, 2008, to May 24, 2010. In the affected vehicles, the connector module that controls the blower motor speed for the heating, ventilation and air conditioning system may overheat.
GM IS RECALLING CERTAIN MODEL YEAR 2006 THROUGH 2010 HUMMER H3 VEHICLES. SOME OF THESE VEHICLES HAVE A CONDITION IN WHICH THE INTEGRAL CLIP-TABS ON THE LOUVER ON THE HOOD MAY FRACTURE, CAUSING THE HOOD LOUVER RATTLE AGAINST THE HOOD AND BECOME LOOSE. IF THIS INDICATOR IS UNNOTICED, ADDITIONAL CLIPS COULD FRACTURE AND THE HOOD LOUVER COULD DETACH FROM THE VEHICLE.
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
“The pass lock in this vehicle is faulty. On numerous occasions, it has left me unable to start the vehicle, but if you wait 10 minutes each time, it will start again, but it happens all the time. I've seen numerous complaints online and GM needs to do something about it.”
“The last dealership I went to they advised to come th the dealership but when I got there nobody wasn’t trying to work there instead the said that it was going to be hard to work on it cause nobody work on those cars anymore and then they said they were going to order the part but never call me back for it. Call them but gave me the runaround basically.”
“WHILE DRIVING ON FAMILY PROPERTY (OPEN FIELD) STABLE GROUND NO INCLINES, HILLS, OR PITCHES AND GOING ABOUT 5MPH ALL OF MY SIDE IMPACT AIRBAGS RANDOMLY DEPLOYED. THERE WAS NO HIT, NO IMPACT, NO BOUNCES HIT, NO NOTHING. JUST ALL AT RANDOM. THE VEHICLE WAS COMPLETE STABLE AND UPRIGHT WHEN THIS OCCURRED. *TR”
Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.
| Version | City | Hwy | Comb. | Fuel / yr | CO₂ g/mi |
|---|---|---|---|---|---|
| H3 4WD Auto 4-spd, 5 cyl, 3.7 L · 4-Wheel or All-Wheel Drive | 14 | 18 | 15 | $4,150 | 592 |
| H3 4WD Man 5-spd, 5 cyl, 3.7 L · 4-Wheel or All-Wheel Drive | 13 | 18 | 15 | $4,150 | 592 |
| H3 4WD Auto 4-spd, 8 cyl, 5.3 L · 4-Wheel or All-Wheel Drive | 13 | 16 | 14 | $4,450 | 635 |
| Item | Miles | Time | Note |
|---|---|---|---|
| Engine oil & filter | 5,000–10,000 mi | 6–12 months | Follow the oil-life monitor if fitted |
| Tire rotation | 5,000–7,500 mi | Every oil change | Check pressure monthly |
| Engine air filter | 15,000–30,000 mi | 1–2 years | Sooner in dusty areas |
| Cabin air filter | 15,000–25,000 mi | 1–2 years | |
| Brake fluid | — | 2–3 years | Absorbs moisture over time |
| Coolant | 60,000–100,000 mi | 5–10 years | Long-life coolants last longer |
| Spark plugs | 60,000–100,000 mi | — | Iridium/platinum plugs at the long end |
| 12V battery | — | 3–5 years | Heat shortens battery life |
2 safety recalls as of Nov 10, 2026, according to NHTSA. Recall repairs are free at a dealer. Check your VIN to see whether your car is included and whether the repair was done.
Owners filed 113 complaints with NHTSA. The most-cited components are electrical system (34), engine (18), air bags (17). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.
The EPA rates the 2008 Hummer H3 at 14–15 mpg combined, depending on engine and drivetrain (3 versions rated).