Problems · NHTSA complaints
2007 Hummer H3 problems
Owners filed 238 complaints about the 2007 Hummer H3 with NHTSA between Feb 2007 and Oct 2026. The most-cited component is electrical system (76).
Complaints
238
Filed with NHTSA
Crashes
12
Reported by owners
Fires
18
Reported by owners
Injuries
19
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Electrical system76
- Engine44
- Visibility/wiper24
- Structure22
- Visibility20
- Power train19
- Air bags19
- Engine and engine cooling13
- Electronic stability control (esc)12
- Fuel/propulsion system11
- Equipment9
- Service brakes7
- Suspension6
- Steering5
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
7
4
11
6
6
13
12
29
48
38
18
13
12
5
8
3
1
1
1
2
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2007 | 7 |
| 2008 | 4 |
| 2009 | 11 |
| 2010 | 6 |
| 2011 | 6 |
| 2012 | 13 |
| 2013 | 12 |
| 2014 | 29 |
| 2015 | 48 |
| 2016 | 38 |
| 2017 | 18 |
| 2018 | 13 |
| 2019 | 12 |
| 2020 | 5 |
| 2021 | 8 |
| 2022 | 3 |
| 2023 | 1 |
| 2024 | 1 |
| 2025 | 1 |
| 2026 | 2 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Electrical system
76 reports1 crash14 fires
“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. The charred remains of the vehicle were towed to a local tow yard. A Police report was filed. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 197,000.”
Engine
44 reports1 crash2 fires
“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.”
Visibility/wiper
24 reports
“TL* THE CONTACT OWNS A 2007 HUMMER H3. THE CONTACT STATED THAT THE DOOR LOCKS FAILED PERSISTENTLY. THE CONTACT ALSO MENTIONED THAT THE PASSENGER SIDE WINDOW BROKE FREQUENTLY. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC, BUT THE CAUSE OF THE FAILURES WAS NOT DETERMINED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED. THE FAILURE MILEAGE WAS APPROXIMATELY 85,000. ...UPDATED 05/17/17 *BF *CN”
Structure
22 reports1 crash1 related recall
“i was driving my hummer on the highway about 45 miles an hour when i felt somthing poped and the back started to sway back and forth so i startted slowing down and i was all over the road came to a stop on side of the road looked underneath and my drivers side wheel was all the way back against the body looked up and the frame had broken off and the spring in back also broke off rusted and the so called frame was so thin no wander it rusted why so thin they should be held accountable for making unsafe frame like this if i would have been on interstate beside a semi or other cars im shure me and others would have lost our lives no doubt i am very pissed about this i got my friend to bring trailer hauld home so now what junk or what i want them to fix it and loaner why they do.”
Visibility
20 reports3 fires1 related recall
“TL* THE CONTACT OWNS A 2007 HUMMER H3. THE CONTACT STATED THAT WATER ENTERED THE VEHICLE FROM THE SUN ROOF ASSEMBLY. THE CONTACT STATED THAT WHILE VACUUMING WATER OUT OF THE VEHICLE, THE AIR BAGS IN THE VEHICLE DEPLOYED WITHOUT WARNING. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT THE SUN ROOF DRAIN TUBES WERE CLOGGED WHICH FAILED TO DRAIN WATER AS INTENDED. THE VEHICLE WAS NOT REPAIRED. THE VEHICLE WAS TAKEN TO BOYLE BUICK GMC TRUCK (3015 EMMORTON RD, ABINGDON, MD 21009) WHERE THE DASHBOARD WAS TAKEN APART AND THE CONTACT WAS INFORMED THAT THE DRAIN LINES WERE DISCONNECTED. THE DRAIN LINES WERE CLEANED AND RECONNECTED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND PROVIDED A CASE NUMBER. THE APPROXIMATE FAILURE MILEAGE WAS 57,000.”
Power train
19 reports
“TL* THE CONTACT OWNS A 2007 HUMMER H3. THE CONTACT STATED THAT WHILE DRIVING, THE POWER REDUCTION AND STABILITY CONTROL WARNING LIGHTS ILLUMINATED. THE VEHICLE DECELERATED INDEPENDENTLY. THE VEHICLE WAS PULLED OVER AND RESTARTED. THE FAILURE RECURRED. THE VEHICLE WAS TAKEN TO JIM GLOVER CHEVROLET LOCATED AT 707 W 51ST ST, TULSA, OK 74107, WHERE A DIAGNOSTIC TEST WAS PERFORMED. THE TECHNICIAN DIAGNOSED THAT THE TRANSMISSION NEEDED TO BE REPLACED. THE VEHICLE WAS TOWED AN INDEPENDENT MECHANIC WHO REBUILT THE TRANSMISSION. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS UNKNOWN.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.