2008 Hummer H3 Problems
- Complaints
- 113filed with NHTSA
- Median mileage
- 77,079miles, 87 complaints with mileage
- Recalls
- 2campaigns on record
- Trend
- FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
- NHTSA crash rating
- —overall rating starts with 2011 models
- EPA fuel economy
- 15 mpgcombined, 3.7L 5-cyl 4WD/AWD · 14 city / 18 hwy
Sources: NHTSA records for the 2008 Hummer H3 (complaints, recalls, investigations), NHTSA crash tests, EPA fuel economy. Report an error
What owners report
Owners of this model year most often describe a start-up problem in which the anti-theft system holds the vehicle for about 10 minutes before it will crank, and a separate cluster of complaints about the heating and A/C blower quitting or a connector melting. Sunroof drains that clog or pinch and let water into the cabin come up repeatedly, as do radiator cracks and side curtain airbags deploying with no impact. Complaints cluster from roughly 40,000 to 130,000 miles, with a number logged at low mileage on newer vehicles.
- Electrical system
Anti-theft system blocks starting (no crank)
- 15 complaints (13%)
- median 83,000 mi at 9.3 yrs old (13 state mileage)
- filed 2014–2025
Owners describe turning the key and getting nothing, sometimes a single click, with a security indicator lit on the dash. Waiting about 10 minutes lets the system reset and the vehicle starts, and some report the interval growing longer over time or the problem happening several times a day. Dealers and shops often could not reproduce it; owners who paid for repairs were told the ignition switch or lock cylinder assembly may need replacement. Reported from very low mileage up past 150,000 miles, occurring intermittently and more often noticed in cold weather.
What to check: Before buying, start the truck cold several times and watch for the security light; ask whether the ignition switch or lock cylinder has been replaced, and whether a no-crank/no-start code was ever stored.
2 excerpts from owner complaints in NHTSA records
“When attempting to start the vehicle, it locks me out for 10 min, I had it happen two times in a row where I couldn't start it for 20 minutes and was late for work. I have been suck in -20 degree weather with my child. This is an on going issue, and there isn't an error code that pops up when I had it checked. This needs to be fixed!! There is no way to tell when it is going to happen, therefore it has made it very unreliable and has put me and my family at risk.”
NHTSA complaint #11342985, filed 2020-08, 109,000 miles“My Hummer was parked in my garage and would not start. There was a clicking noise when I turned the key. I called aaa thinking it was a dead battery. They came out, got in the car and it started right up. They tested all electrical and found no issues. The battery is less than 2 years old. A few weeks later, I drove a short distance, parked and turned off my Hummer. Less than 1 minute later, I got in and it would not start. This time, no clicking noise, nothing. …”
NHTSA complaint #11030566, filed 2017-09, 84,000 miles - Air bags
Side curtain airbags deploy without a crash
- 16 complaints (14%)
- median 57,000 mi at 5.5 yrs old (15 state mileage)
- 5 mention a crash, fire or injury
- filed 2010–2020
Owners describe the side curtain airbags firing while driving at low speed, on gravel or uneven ground, or while parked, with no impact involved. Some report ringing ears, bruising or cuts, and locked seat belts afterward. According to the complaints, dealers and the manufacturer often found no fault or declined to cover the repair; one owner was told a rollover sensor had registered a deployment without the airbags actually firing. Reported between roughly 28,000 and 146,000 miles, often at low speed or on rough surfaces.
What to check: Check that the airbag warning light comes on at key-on and goes out after the bulb check, and ask whether any airbag or rollover sensor work has been done; a scan tool can show stored deployment or sensor codes.
2 excerpts from owner complaints in NHTSA records
“I own a 2008 Hummer H3 alpha. Yesterday, 9-18-2010 the side curtain airbags deployed for no reason. I have a bruise on the side of my face, a cut on my neck, and my ear is still ringing. There are several reports of this happening on Hummer H3's posted on the internet, and from what I'm reading, GM is not replacing the airbags.”
NHTSA complaint #10356380, filed 2010-09, 45,432 miles“While driving on a gravel road upwards on a gravel road (not a legal street) going under 10mph, the side upper airbags deployed by themselves without being in an accident or anything being structurally damaged. I was dazed, and might of had a slight concussion. The passenger was knocked unconscious, and her ribs and back hurt. I have read on many forums that this similar situation has occurred. There are more situations but please read below. …”
NHTSA complaint #10884405, filed 2016-07, 121,000 miles - Visibility (wipers, defrost, mirrors)
A/C and heater blower quits; melted connector
- 22 complaints (19%)
- median 83,963 mi at 6.7 yrs old (18 state mileage)
- 6 mention a crash, fire or injury
- filed 2010–2025
Complaints describe the blower motor stopping, often with some fan speeds still working or the system cutting in and out, and some owners report a burning plastic smell or smoke from the vents. On inspection the blower resistor and its connector are found melted or burnt through. Dealers typically replaced the blower motor, resistor and harness, and several owners say the failure came back afterward. Mostly reported between about 17,000 and 110,000 miles, frequently in hot weather or with the A/C on.
Recall 15V4210002 related service bulletins
What to check: Run the fan through every speed with the engine warm, smell for hot plastic at the passenger footwell, and ask whether the blower motor resistor and connector were replaced under the blower-motor recall.
2 excerpts from owner complaints in NHTSA records
“I looked on the internet to find out why my heater blower was not working and there were lots of complaints about the wiring harness and resistor burning out. I checked mine and sure enough mine was burnt on the wiring harness all the way through the plastic. Gm needs to figure out why it would cause it to malfunction like that cause it could cause a fire.”
NHTSA complaint #10483371, filed 2012-11, 78,000 miles“The air conditioning began working intermittently two years ago. About a year ago it stopped completely. The issue is related to overheating or melting of an electrical component (ours has melted and is visible) and I received a recall notice over a month ago but the part is still unavailable to do the repair. I live in florida where the temperatures are high most of the year so I have been deprived of full use of my vehicle for almost two years. …”
NHTSA complaint #10781237, filed 2015-10, 46,000 miles - Engine
Radiator cracks and coolant leaks
- 12 complaints (11%)
- median 68,000 mi at 6.0 yrs old (11 state mileage)
- 1 mention a crash, fire or injury
- filed 2012–2020
Complaints describe coolant loss, a sweet smell, or the temperature gauge climbing, with the crack found along the plastic top tank of the radiator. Several owners say a shop or dealer attributed it to the radiator rubbing or flexing against the body or an upper rail, and that replacement was the fix; some owners added shims to keep it from recurring. Others report repeat overheating and coolant top-offs before the crack was found. Spread from roughly 24,000 to 103,000 miles, often noticed as a sudden leak rather than a slow one.
What to check: Look along the top tank seams of the radiator for hairline cracks or dried coolant residue, check the coolant level and color, and ask whether the radiator has already been replaced.
2 excerpts from owner complaints in NHTSA records
“While driving I noticed heavy smell of antifreeze.. I took to local shop and we noticed antifreeze all over engine. Radiator had crack on top. After research I see multiple complaints online with other Hummer owners same issue. Had to replace radiator. Mechanic said ther radiator rubs and bounces against the frame causing crack.”
NHTSA complaint #10726316, filed 2015-06, 68,000 miles“I have a 08 Hummer H3 and just found out that I have a cracked radiator. The vehicle only has 52,891 miles on it. This seems to be happening alot to the 07 and 08 Hummer H3. I think we need a recall on this. All of the forums I have seen have had theirs crack in the same place. All on top of the radiators. This is something you might want to look into. I know personally I am tired of something going wrong on this. First was the rack and pinion with only 50,844 miles and now this. Come on its time for a recall.”
NHTSA complaint #10476991, filed 2012-09, 52,891 miles - Visibility (wipers, defrost, mirrors)
Sunroof drains clog and water enters cabin
- 5 complaints (4%)
- median 60,000 mi at 7.5 yrs old (4 state mileage, few)
- filed 2010–2020
Owners report rain or wash water appearing on the floorboards, headliner stains and damp carpet, which they trace to the sunroof drain tubes clogging or being pinched in the trim. Some describe water pouring in while driving in rain and windows fogging up as a result. Repairs involved clearing or rerouting the drains, and owners say the problem came back after clearing. Reported from about 42,000 to 132,000 miles, typically during or after rain.
What to check: Pour water into the sunroof tray with the roof closed and confirm it drains under the truck rather than into the footwells; check carpets and headliner for stains or dampness.
2 excerpts from owner complaints in NHTSA records
“Sunroof drains collect water and there is moisture inside the vehicle. Based on the dealership review it is due to a faulty design of the drains due to the restrictions at both front and rear.”
NHTSA complaint #10505665, filed 2013-04, 42,000 miles“Nothing lead to the failure. Second occurrence in 11 month period of time. First occurrence 12/3/2009 and now another repair needed 11/4/2010. Sunroof channels clogging and leaking water into vehicle. Hazard when driving in rain when water pour through the vehicle dousing and distracting the driver which could result in a possible jerk of the wheel or wreck. Front windshield also begins to fog to do moisture and impedes view of road. Water pouring into vehicle causing mold in carpet, seats and electrical components.”
NHTSA complaint #10363985, filed 2010-11, 37,784 miles
Buying note. Check the start-up behavior, blower operation, sunroof drains, radiator seams and airbag warning light on any example you look at, since these are the areas owners write about most. Ask for service records showing whether the blower-motor recall and any radiator or ignition switch work were completed.
Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.
NHTSA recorded 113 consumer complaints for the 2008 Hummer H3. 87 of the complaints include a mileage, and 29% of those were filed for vehicles with under 50,000 miles; the median is 77,079 miles. Of all complaints, 3 involved a crash, 6 a fire, 5 an injury, according to the filers. NHTSA lists 2 recall campaigns and 905 technical service bulletins for this model year.
Not compared (fewer than 3 comparable model years). Model years 2008–2023 of the same vehicle that have at least 25 complaints are compared, and a model needs at least 3 of them.
Which parts are reported most
Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.
- Electrical system34 30%
- Engine18 16%
- Air bags17 15%
- Other or unknown9 8.0%
- Body and structure8 7.1%
- Steering5 4.4%
- Brakes4 3.5%
- Engine cooling4 3.5%
- Equipment4 3.5%
Also reported: Fuel system (4), Suspension (4), Exterior lighting (3), Seats (3), Wheels (2), Electronic stability control (1), Seat belts (1), Transmission and drivetrain (1), Vehicle speed control (1).
Example complaints
Electrical system: “I was driving along and there was smoke coming from below passenger side under the glove box. Pull over and saw it was a resistor with two screws. It was burnt, I unplugged and drove home. Then searched internet and there are hundreds of people with the same problem. This needs to be a recall asap, before someone dies in a fire.”
NHTSA complaint #10592207, filed 2014-05, 71,000 milesVisibility (wipers, defrost, mirrors): “Smell of burning plastic and the A/C stopped blowing. The A/C works on the lower speeds. Burnt/melted plug on the A/C resistor plug. From what I have found online this is a very common problem with H3's at about 40-60k miles. Why wont GM do a recall if this is a daily problem with H3 owners. How many H3's have caught fire from this ? It was over a 110 degrees when mine went out. What if I had young child or an elderly person in the vehicle at that temp ?”
NHTSA complaint #10472095, filed 2012-08, 63,000 milesEngine: “The antilock safety is preventing me from starting my vehicle. When it does start, and I go to an intersection to turn the truck will then stall out. It can cause a wreck. It is a huge safety issue, time consuming, and money consuming when I have to wait 10 minutes to try to start my truck, or it doesn't start, I have to replace it for $450+ which I don't have to replace the ignition switch and it's dangerous because if it does let it start I have to be careful because it will stall out on any given second causing a catastrophe!!! …”
NHTSA complaint #11415729, filed 2021-05, 100,000 milesAir bags: “Takata recall. I was driving between 10-15 MPH on a side road approaching a stop sign to get onto the main highway and the side airbags on both sides deployed on their own. Nothing hit the vehicle to cause them to release. It locked up my front seat belts also. I cut the airbags out to be able to see to drive home, and was able to pull the driver's seat belt around me enough to make it home. I called my insurance company and then called the local Hummer dealer to leave a message for them to return my call. …”
NHTSA complaint #10885305, filed 2016-07, 80,400 milesMileage when problems were reported
29% of the 87 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 46,000 and 101,421 miles.
Complaints by year filed
Trend: falling. Complaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
Crash test ratings
NHTSA's 5-Star Safety Ratings for the 2008 Hummer H3. Frontal results are shown driver / passenger; rollover shows the star rating and NHTSA's estimated risk of rolling over in a single-vehicle crash.
| Version | Overall | Frontal | Side | Side pole | Rollover |
|---|---|---|---|---|---|
| H3 · sedan AWD | not rated | 5 / 4 | — | — | 3 · 24.6% risk |
Ratings before the 2011 model year come from an older, less demanding test and are not comparable with ratings for 2011 and later.
Source: NHTSA New Car Assessment Program (5-Star Safety Ratings), nhtsa.gov/ratings.
Fuel economy and running cost
EPA ratings for each 2008 Hummer H3 version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).
| Version | Engine | Transmission | City | Hwy | Comb. | Fuel / yr |
|---|---|---|---|---|---|---|
| H3 4WD | 3.7L 5-cyl | 4-speed automatic | 14 | 18 | 15 | $4,450 |
| H3 4WD | 3.7L 5-cyl | 5-speed manual | 13 | 18 | 15 | $4,450 |
| H3 4WD | 5.3L 8-cyl | 4-speed automatic | 13 | 16 | 14 | $4,800 |
Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.
Recalls and investigations
- 15V421000Jul 1, 2015Visibility › Defroster/defogger/hvac system › Fan/motorCovers: Hummer H3 2006–2010
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…
- 10V179000Apr 30, 2010Structure › Body › HoodCovers: Hummer H3 2006–2010
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…
Recall details for the 2008 Hummer H3 → · Check a VIN at nhtsa.gov/recalls
Technical service bulletins
TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 905 on record; the latest 10 are shown.
- 11023091Sep 9, 2025Other or unknown. New Vehicle Monitoring Programs Section in IVH
- 11021792Aug 7, 2025Other or unknown. This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming…
- 11020816Jul 18, 2025Other or unknown. This PI communicates the requirement to provide a pico file to receive diagnostic assistance from TAC.
- 11019074May 30, 2025Other or unknown. This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini 50 terminal test probe, replacement terminals, and terminated leads.
- 11019073May 30, 2025Other or unknown. This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini 50 terminal test probe, replacement terminals, and terminated leads.
- 11019072May 30, 2025Other or unknown. This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini 50 terminal test probe, replacement terminals, and terminated leads.
- 11017252Mar 28, 2025Other or unknown, Electrical system. This service bulletin provides information for dealers/technicians on OnStar Module 2G Sunset Information.
- 11014455Feb 20, 2025Other or unknown. This Preliminary Information communication provides information to the technician about vehicles that have an unusual noise and is difficult to identify, isolate or pinpoint. Technician should get…
- 11011782Dec 7, 2024Other or unknown. This Preliminary Information communication provides information to the technician about the use of J-35616-64B terminal test probe, replacement terminals, and terminated leads. The J-35616-64B is…
- 11009156Oct 25, 2024Electrical system. This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester…
Other model years of the Hummer H3
| Year | Complaints | Median mi | Recalls | Crash ★ | MPG | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|---|
| 2010 | 7 | 60,000 | 2 | — | 15 | — | Not enough data |
| 2009 | 69 | 74,550 | 2 | — | 16 | Not compared (fewer than 3 comparable model years) | Falling |
| 2008 | 113 | 77,079 | 2 | — | 15 | Not compared (fewer than 3 comparable model years) | Falling |
| 2007 | 238 | 84,908 | 2 | — | 15 | Not compared (before 2008) | Falling |
| 2006 | 361 | 75,000 | 4 | — | 16 | Not compared (before 2008) | Stable |
All Hummer H3 model years · Best and worst years by complaints
Frequently asked questions
What are the most common problems with the 2008 Hummer H3?
Owners of this model year most often describe a start-up problem in which the anti-theft system holds the vehicle for about 10 minutes before it will crank, and a separate cluster of complaints about the heating and A/C blower quitting or a connector melting. The issues reported most often: Anti-theft system blocks starting (no crank); Side curtain airbags deploy without a crash; A/C and heater blower quits; melted connector.
How many NHTSA complaints does the 2008 Hummer H3 have?
NHTSA recorded 113 consumer complaints for the 2008 Hummer H3 as of Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
What part of the 2008 Hummer H3 is reported most often?
Electrical system is named most often, in 34 complaints (30% of the total), followed by visibility with 27.
Has the 2008 Hummer H3 been recalled?
NHTSA lists 2 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.
What gas mileage does the 2008 Hummer H3 get?
The EPA rates the 2008 Hummer H3 (H3 4WD, 3.7L 5-cyl) at 15 mpg combined, 14 city and 18 highway, with an estimated annual fuel cost of $4,450 at 15,000 miles a year. Other engine and drive versions are rated differently.
At what mileage are problems with the 2008 Hummer H3 reported?
Among the 87 complaints that include a mileage, the median is 77,079 miles and the middle half falls between 46,000 and 101,421 miles; 29% were filed for vehicles with under 50,000 miles.
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Crash ratings are from NHTSA’s New Car Assessment Program. Fuel economy is from the EPA and DOE (fueleconomy.gov).
Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.