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Hummer H3Model year report

2007 Hummer H3 Problems

Complaints
238filed with NHTSA
Median mileage
84,908miles, 192 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 2007 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 electrical troubles: a security (Passlock) system that intermittently prevents starting or cuts power while driving, and a blower-motor resistor circuit behind the glove box that has burned or melted. Engine complaints center on misfires and cylinder-head valve problems, and many reports also cover water leaking in through the sunroof and the hood louver coming loose. Reports are spread fairly evenly from low mileage up past 100,000 miles.

  1. Electrical system

    Passlock security system blocks starting or cuts power

    • 43 complaints (18%)
    • median 89,500 mi at 9.1 yrs old (36 state mileage)
    • 2 mention a crash, fire or injury
    • filed 2009–2022

    Owners describe turning the key and getting a normal crank but no start, sometimes with the security light on, then the vehicle starts after an unexplained wait of about 10 minutes. Some report the engine quitting or losing power briefly at speed, which they link to the same theft-deterrent system. Complaints mention repeated repair attempts at dealers without a lasting fix, and a GM technical bulletin addresses intermittent no-crank or start-stall conditions with the security light on and specific diagnostic codes. Reported from about 40,000 to over 160,000 miles, with many between 65,000 and 135,000.

    2 related service bulletins

    What to check: Try several cold starts and watch the security light; ask whether the ignition/Passlock system has been serviced. Scan for stored body codes if possible.

    2 excerpts from owner complaints in NHTSA records

    “Hummer H3 has passlock security problem when driving. When I drive the Hummer at any speed my Hummer locks out and activates the security lock and looses power for 10 seconds and gains power again or looses power completely forcing me to pull over and turn my car back on.”

    NHTSA complaint #10605314, filed 2014-06, 100,000 miles

    “I stopped at gas station for fuel. Vehicle would not start for approximately 10 minutes after fueling up. Then it started. Apparently this is a wide spread problem with the Hummer, as I have read a number of incidents reported on line with same issue.”

    NHTSA complaint #11105257, filed 2018-07, 127,250 miles
  2. Electrical system

    Blower motor resistor and connector overheating

    • 54 complaints (23%)
    • median 85,200 mi at 8.2 yrs old (48 state mileage)
    • 16 mention a crash, fire or injury
    • filed 2007–2026

    Complaints describe the heater and A/C blower stopping because the resistor or connector module behind the glove box has overheated, melted or burned, in some cases with a burning-plastic smell or visible smoke. Some owners report the part was replaced and the problem returned. A recall covers the blower motor connector module on this model, and owners describe waiting for parts or being told a remedy was not yet available. Appears from roughly 40,000 to 140,000 miles, with several reports in the 60,000-120,000 range.

    Recall 15V4210002 related service bulletins

    What to check: Ask whether recall 15V421000 was completed and have the blower resistor and connector inspected for melting or discoloration; confirm the blower works on every speed setting.

    2 excerpts from owner complaints in NHTSA records

    “My vehicle has a very common issue with a faulty resistor/wiring harness on the blower motor. There is a safety recall for the same problem on other GM trucks & vehicles and the problem is widely known/reported on the internet. For some reason GM refuses to issue/fix this recall for the Hummer H3? The problem causes the wiring to get so hot to melt the insulation, which could cause a fire. I park my vehicle in an attached garage.”

    NHTSA complaint #10459267, filed 2012-05, 40,000 miles

    “I had dropped my daughter off at school then went to the gas station and I smelled something like it was burning and I thought it was out side. When I came out of the gas station there was smoke rolling out of my Hummer . I had jumped in and moved the vehicle away from the pumps so they would not blow up and hurt the patrons around us. The fire dept came and so did the police. They told me that the blow had started from behind the glove compartment and was on fire.”

    NHTSA complaint #10272799, filed 2009-06, 17,000 miles
  3. Engine

    Engine misfire and cylinder head valve problems

    • 20 complaints (8%)
    • median 68,395 mi at 8.2 yrs old (20 state mileage)
    • 1 mention a crash, fire or injury
    • filed 2010–2021

    Owners report check-engine lights, rough idle, shaking, loss of power and poor fuel economy, often traced to misfiring cylinders. Some complaints state that valve seals or cylinder heads failed and that the head or engine needed replacement, while others describe spark plug and coil replacements that did not resolve the issue. Dealers are reported as sometimes unable to reproduce the fault initially. Spread from about 40,000 to 135,000 miles, with many reports between 56,000 and 95,000.

    2 related service bulletins

    What to check: Have a shop read stored and pending codes and check compression or do a leak-down test on cylinders 2 and 5 before buying; watch for rough idle and hesitation on a test drive.

    2 excerpts from owner complaints in NHTSA records

    “Vehicle misfires frequently. Engine will nearly stall at idle due to misfires and shake the whole vehicle. Lack of power and efficiency. And juddering while accelerating. It is known to GM and many people have had to resort to cylinder head replacements costing hundreds at a minimum.”

    NHTSA complaint #11388405, filed 2021-01, 95,000 miles

    “Engine check light came on for very short period of time then went out. About a week later it came on again. Went to chevy dealer who ran a quick code check which indicated the number 5 cylinder was misfiring. The chevy dealer indicated the engine/power train warrranty had expired and the problem could be from injectors, plugs, coil and valves. Initial computer check would cost $135. Vehicle is sitting in my garage awaiting money to get it checked.”

    NHTSA complaint #10690907, filed 2015-02, 66,790 miles
  4. Body and structure

    Hood louver detaching from the hood

    • 13 complaints (5%)
    • median 123,000 mi at 11.0 yrs old (10 state mileage)
    • filed 2013–2023

    Complaints describe the louver or grille panel on the hood rattling, coming loose or detaching while driving, sometimes in a car wash and once at highway speed. Owners note that a recall covers this part but that some vehicles were reportedly serviced or told they were not covered. The remedy described in the recall involves securing or replacing the louver. Reported from very low mileage up to about 164,000 miles, with several reports between 68,000 and 140,000.

    Recall 10V179000

    What to check: Press on the hood louver and check for loose or cracked clip tabs, and ask whether recall 10V179000 was performed and documented.

    2 excerpts from owner complaints in NHTSA records

    “I bought this vehicle used approximately 7 years ago. I was taking my vehicle through an automated car wash and the hood vent came completely off. I noticed there was a recall in 2010 concerning this part but I never got notification. When I look up by my VIN, it states no recalls. Why not? I noticed it was loose at one lower corner and already had discussed fixing it with the body shop. I need the hood vent replaced now since it tore the latches loose from the top.”

    NHTSA complaint #10706310, filed 2015-04, 68,000 miles

    “Yesterday, january 9, 2018, the louvre on the front of my vehicle blew off while I was driving. It was subsequently run over by the vehicle behind me and broken. Lucky no one was hurt. In researching the replacement part, I came to learn that there was a recall issued to remedy the problem. I contacted cadillac of dublin to replace/repair the louvre. They then informed me that the recall had been done at jeff wyler in ky. This is categorically untrue. Clearly, the recall was not done. …”

    NHTSA complaint #11061956, filed 2018-01, 138 miles
  5. Visibility (wipers, defrost, mirrors)

    Water leaking from sunroof into the cabin

    Mentioned in 4 of 60 sampled complaints

    Owners report water pouring in through the sunroof area in rain, sometimes from the overhead speaker area and onto the floor. One complaint states the sunroof drain tubes were clogged and that water accumulation was followed by unexpected airbag deployment. Repairs described include clearing drains and dealer inspection of the headliner and dashboard area. Reported from about 50,000 to 65,000 miles in the sample, generally during or after rain.

    What to check: Look for water stains on the headliner and floor, check that sunroof drains are clear by pouring water around the sunroof, and check for damp carpet or musty odor.

    2 excerpts from owner complaints in NHTSA records

    “The contact owns a 2007 Hummer H3. The contact stated that when making a right turn, the vehicle would make a hard pumping sound. The dealer diagnosed no failure with the vehicle, but the contact believes there was an axle issue. The manufacturer was not contacted and the vehicle was not repaired. The failure mileage was 36,500 and the current mileage was 37,000. The VIN was unavailable.”

    NHTSA complaint #10437888, filed 2011-11, 36,500 miles

    “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”

    NHTSA complaint #10953904, filed 2017-02, 85,000 miles

Buying note. Check that both open recalls were completed and have a shop look at the blower resistor, cylinder compression and sunroof drains before purchase, since these are the items owners report most on this model year.

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 238 consumer complaints for the 2007 Hummer H3. 192 of the complaints include a mileage, and 21% of those were filed for vehicles with under 50,000 miles; the median is 84,908 miles. Of all complaints, 12 involved a crash, 18 a fire, 19 an injury, according to the filers. NHTSA lists 2 recall campaigns and 812 technical service bulletins for this model year.

Not compared (before 2008). 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.

Also reported: Brakes (11), Equipment (8), Suspension (6), Steering (5), Seats (4), Vehicle speed control (4), Tires (3), Exterior lighting (2), Latches, locks and linkages (2), Seat belts (2).

Example complaints

Electrical system: “Vehicle won't start. The passlock prevents the vehicle from starting. The car alarm will start while I'm outside the vehicle and then the vehicle won't start. I replaced the battery but the passlock still makes the alarm go off while its locked in the driveway.”

NHTSA complaint #11005946, filed 2017-07, 101,600 miles

Engine: “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.”

NHTSA complaint #10887638, filed 2016-07, 140,000 miles

Visibility (wipers, defrost, mirrors): “I was in a parking lot, I started the vehicle and turned the air conditioner on. It worked but suddenly stopped blowing air. I took it in and it was diagnosed as the blower motor resistor had gone out. I had it replaced only to have the same thing happen again one week later but this time I smelled something burning. The wiring had burned going to the resistor. The technician informed me that this happens often with these vehicles and he doesn't understand why there isn't a recall. …”

NHTSA complaint #10477479, filed 2012-09, 76,500 miles

Other or unknown: “Our 2007 H3 had cracked radiator with hose leaking coolant causing the overheating. We have never driven the vehicle off-roading and no warning light was displayed for this issue. Instead, we brought it in for a different issue with the fuel line and discovered the cracked radiator, which could have caused a bigger problem if it had gone undiscovered for longer period of time.”

NHTSA complaint #10779356, filed 2015-10, 97,000 miles

Mileage when problems were reported

21% of the 192 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 57,000 and 120,000 miles.

6%0–104%10–2512%25–5024%50–7516%75–10031%100–1508%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (192 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 84,908 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.

’08’11’1448’17’20’23’26
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Crash test ratings

NHTSA's 5-Star Safety Ratings for the 2007 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.

VersionOverallFrontalSideSide poleRollover
H3 · sedan AWDnot rated5 / 4——3 · 24.6% risk
H3 · sedan (side air bags) AWDnot rated5 / 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 2007 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).

VersionEngineTransmissionCityHwyComb.Fuel / yr
H3 4WD3.7L 5-cyl4-speed automatic141815$4,450
H3 4WD3.7L 5-cyl5-speed manual141815$4,450

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

Recall details for the 2007 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. 812 on record; the latest 10 are shown.

See all 812 bulletins →

Other model years of the Hummer H3

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
2010760,0002—15—Not enough data
20096974,5502—16Not compared (fewer than 3 comparable model years)Falling
200811377,0792—15Not compared (fewer than 3 comparable model years)Falling
200723884,9082—15Not compared (before 2008)Falling
200636175,0004—16Not 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 2007 Hummer H3?

Owners of this model year most often describe electrical troubles: a security (Passlock) system that intermittently prevents starting or cuts power while driving, and a blower-motor resistor circuit behind the glove box that has burned or melted. The issues reported most often: Passlock security system blocks starting or cuts power; Blower motor resistor and connector overheating; Engine misfire and cylinder head valve problems.

How many NHTSA complaints does the 2007 Hummer H3 have?

NHTSA recorded 238 consumer complaints for the 2007 Hummer H3 as of Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2007 Hummer H3 is reported most often?

Electrical system is named most often, in 76 complaints (32% of the total), followed by engine with 44.

Has the 2007 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 2007 Hummer H3 get?

The EPA rates the 2007 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 2007 Hummer H3 reported?

Among the 192 complaints that include a mileage, the median is 84,908 miles and the middle half falls between 57,000 and 120,000 miles; 21% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 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.