Most common 2007 Hummer H3 problems
Share of the 238 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Hummer H3 complaints by model year
Best H3 years: 2010, 2009, 2008. Years to avoid: 2006, 2007. Compare all years →
2007 Hummer H3 recalls (2)
Visibility › Defroster/defogger/HVAC system › Fan/motor
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.
Remedy: GM will notify owners, and dealers will replace part of the blower motor connector and harness, free of charge. The recall began February 26, 2016. Owners may contact Hummer customer service at 1-800-732-5493.
Structure › Body › Hood
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.
Remedy: Dealers will apply an adhesive to the hood louver to secure it to the hood. This service will be performed free of charge. The safety recall began on April 12, 2010.
What 2007 Hummer H3 owners say
Electrical system all 76 →
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. The AC was turned off, and the smoke ceased. The contact exited the vehicle and went into the store. The contact exited the store and was informed by a shopper that the vehicle was on fire. The vehicle was unoccupied. The fire was coming from underneath the hood of the vehicle. The Fire Department arrived on the scene and extinguished the fire. The Fire Inspector informed the contact that the fire was a thermal event related to HVAC wiring. In addition, the contact was informed of an unknown recall; however, the VIN was not associated with a recall related to the failure. The vehicle was destroyed. …
Odometer Fraud. The contact purchased a 2007 Hummer H3. The contact discovered that there was a mileage discrepancy. The vehicle was an independent dealer sale. At the time of purchase, the vehicle mileage was 122,791 and at the time of registration, it was discovered that the mileage was 122,799 but additional documents also showed that the mileage was unchanged over a 3-year period.
Engine & cooling all 56 →
The contact owns a 2007 Hummer H3. The contact stated while driving at 50 mph, the vehicle started to overheat and stalled. The contact stated the temperature and the check engine warning light were illuminated. The vehicle was then towed to a local dealer where it has yet to be diagnosed due to the battery needing to be replaced. The vehicle was not repaired. The contact had the vehicle serviced under NHTSA campaign number: 15V421000 (Visibility) prior to experiencing the failure. The manufacturer had not been informed of the failure. The failure mileage was approximately 160,000.
Everything from: electrical, air condition, stabilitrack system, which cost me over $600.00 still not working properly. Leakingsun roof censors, I was made to pay for that still dont work. I paid over $8,000.00, or more. When ever I brought my vechicle in, I was forced to for something else, my vechile only had about 22,000.00 miles. I was taking it to GMC/vera Cadillac 300 pembroke pines, fl 33025, ph:[phone], service manager mr.gustavo, edwin montoya. I have over 50 pages documents about fake repairs, my vechicle is wrost off now than before. It also has safty issues, mold/medw, ac overheating, airbag not working, etc. I am afraid for my safty.
Windows, wipers & sunroof all 35 →
The contact owns a 2007 Hummer H3. The contact stated while driving at 50 mph, the vehicle started to overheat and stalled. The contact stated the temperature and the check engine warning light were illuminated. The vehicle was then towed to a local dealer where it has yet to be diagnosed due to the battery needing to be replaced. The vehicle was not repaired. The contact had the vehicle serviced under NHTSA campaign number: 15V421000 (Visibility) prior to experiencing the failure. The manufacturer had not been informed of the failure. The failure mileage was approximately 160,000.
Tl* the contact owns a 2007 Hummer H3. While driving approximately 60 MPH, the contact smelled burning plastic. The vehicle became filled with the odor. The dealer diagnosed that the connector model, blower switch, and HVAC unit melted and needed to be replaced. The manufacturer was notified. The approximate failure mileage was 111,000.
2007 Hummer H3 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 3.7L 5-cyl | 4-speed automatic | 4WD/AWD | 14 / 18 / 15 |
| 3.7L 5-cyl | 5-speed manual | 4WD/AWD | 14 / 18 / 15 |
EPA ratings. Class: SUV.
Frequently asked questions
Is the 2007 Hummer H3 a good car?
Based on 238 owner complaints filed with NHTSA, the 2007 H3 rates avoid: 2.4× as many complaints as a typical year of the H3 at the same age. It is one of the H3 years we suggest avoiding. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2007 Hummer H3?
The electrical system — 76 complaints, 32% of all complaints for this model year, most often about wiring › interior/under dash. Next are the engine & cooling (56) and windows, wipers & sunroof (35).
How many recalls does the 2007 Hummer H3 have?
There are 2 recalls for the 2007 Hummer H3, the most recent from July 1, 2015 (fan/motor). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Hummer H3?
The best years by complaints, compared at the same age, are 2010, 2009 and 2008. Years to avoid or approach with caution: 2006 and 2007. See the full Hummer H3 years comparison.
At what mileage do 2007 Hummer H3 problems happen?
The median mileage reported in complaints is about 85,000 miles; 21% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.