This service bulletin provides information for dealers/technicians on OnStar Module 2G Sunset Information.
full bulletin at NHTSA ↗2007 Hummer H3 electrical problems
severe 72 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
72
Recalls
0
Avg fix
$850
1crash
13fires
When does it fail?
Of the 72 electrical complaints filed for the 2007 Hummer H3, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Electrical accounts for 31% of every owner complaint on file for this vehicle — the dominant problem area across 11 categories tracked.
Owners have filed 72 electrical complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
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, PICO Scope, GR8 starting/charging tester and Vehicle Data Recorder tools, giving website address and step by step instructions to complete the update.
full bulletin at NHTSA ↗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 on. Technician may find Diagnostic Trouble Codes B3055, B3060, and/or B3935. Technician should not replace any parts for this concern. If unable to duplicate the concern ask if the customer uses any Radio Frequency Identification Devices when the concern is present. Dealer should also direct their customers to the appropriate section in the Owner manuals that references that the device complies.
full bulletin at NHTSA ↗Vehicle Wide Programming (VWP) is a new process to update software on GM Vehicles. It provides the ability via a single selection within Techline Connect to first identify which modules need updating and then proceed to updating affected modules (with some exceptions). The updating of modules is completed in parallel instead of the technician needing to update one module at a time. This allows a more streamlined approach for dealers and customers.
full bulletin at NHTSA ↗This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2007 H3's electrical system is deeply problematic. The most dangerous issue is the HVAC blower motor resistor, which overheats and burns under normal operation—sometimes catching fire under the dashboard. GM issued recall 15V421000 in 2015, but replacement parts remained unavailable for months or longer, leaving owners without heat or air conditioning for extended periods. Several owners report actual vehicle fires; one had the engine compartment ignite while driving, totaling the vehicle. Even after the recall repair, at least one owner experienced another fire.
The Passlock anti-theft system malfunctions repeatedly and unpredictably. It prevents starting, forcing 10–30-minute waits to try again, and it stalls the running engine at highway speeds with no warning—cutting power to brakes and steering. GM has not recalled this defect for the H3, despite it being widespread across other GM vehicles. Ignition switches fail or jam; engines lose power without warning while driving. Water leaks through the windshield and sunroof drains, soaking the interior and triggering phantom ABS faults. The traction control system locks up the brakes at highway speeds, nearly causing crashes. Battery drain is chronic, and some owners carry jumper cables just to start the truck. Repair costs run several hundred dollars, often out-of-warranty, and dealers have told owners these are "known problems" they cannot fix. Owners report frustration that GM has known about these issues for years yet refuses recalls or accountability.
Same Hummer H3 electrical reports on nearby years: 2006 · 2008 · 2009
Failure modes owners describe
HVAC blower motor resistor/connector overheating and burning
The HVAC blower motor resistor connector overheats under extended operation at high/medium-high blower speeds, causing the resistor and wiring harness to burn, melt, or catch fire. Owners report burning smells, charred wires, melted plastic insulation, and in severe cases, fires starting under the dashboard/glove box.
When: Typically 40,000–140,000 miles; failures occur during or shortly after running A/C or heater at higher blower settings
Symptoms owners cite: Burning smell from under glove box or dashboard; Blower motor stops working; Visible charred, melted, or burned wiring harness; Fire under dashboard or glove box; Smoke or flame visible in cabin or under hood; Abnormal noise from A/C unit when blower on high
Repairs/costs cited: Owners report replacement of blower motor resistor, wiring harness, and connector; costs cited range from $200+ to $600+; some repairs failed to resolve the issue permanently
Recalls/TSBs owners mention: GM issued recall 15V421000 (Safety Recall 15042) in August 2015 due to fire risk; parts were unavailable for extended periods (months to over a year); some owners reported being offered replacement with same defective part or left without A/C/heat indefinitely
Passlock anti-theft system causing no-start and stalling
The Passlock security system malfunctions, preventing the vehicle from starting or causing it to stall without warning while driving. The system cuts fuel to the engine when it falsely detects a security breach. Owners must wait 10–15 minutes before the vehicle will restart.
When: Can occur at any mileage; reported as early as 40,000 miles and as late as 121,000+ miles; appears throughout vehicle's life
Symptoms owners cite: Passlock warning light illuminates or flashes; Engine cranks but will not start; Vehicle stalls without warning at any speed; Loss of power brakes and steering when stalling occurs; Multiple episodes requiring 10–30 minute waits between restart attempts; No pattern to failures; can happen while driving, parked, or attempting to start; Airbagging warning lights sometimes accompany the issue
Codes mentioned: Passlock disabling system light
Repairs/costs cited: Some owners report disabling the Passlock system entirely to resolve the issue; GM dealerships quoted $200–$800+ to diagnose and repair; no permanent factory fix identified in complaints
Recalls/TSBs owners mention: GM has not issued a recall for this issue on the 2007 H3, despite widespread complaints; GM customer service refused to assist some owners, citing the vehicle's age/warranty expiration; owner mentions similar recalls exist for other GM vehicles but not the H3
Ignition switch failure and key sticking
The ignition switch fails to recognize the key or changes position unintentionally when the vehicle encounters bumps or dips in the road, shutting off the engine and locking the steering wheel. The key may also become stuck in the ignition and not removable.
When: Reported at mileages ranging from 7,000 to 98,000+ miles
Symptoms owners cite: Engine shuts off unexpectedly during driving or at stops; Steering wheel locks when engine shuts off; Key fails to turn to start the vehicle; Key becomes stuck in ignition and cannot be removed; Vehicle will not start on first attempt; multiple tries needed; Engine stalls when making turns or applying brakes
Repairs/costs cited: Ignition switch replacement performed by dealers; failures recurred in some cases despite repairs; some owners paid out-of-pocket after warranty expiration
Recalls/TSBs owners mention: Similar ignition switch recalls exist for other GM vehicles; GM has refused to cover this issue on the 2007 H3 under any active recall/lawsuit settlement, stating it is not covered; GM advised owner to contact SAFECAR.GOV to attempt adding the vehicle to an active recall
Loss of engine power and stalling while driving
The engine loses all power or stalls suddenly while the vehicle is in motion, with no warning. Steering and braking are affected, creating an immediate safety hazard.
When: Mileage not consistently reported; one owner at 40 mph
Symptoms owners cite: Complete loss of engine power while driving; Vehicle stalls without warning; Hazard lights may not respond; Ignition key does not respond to restart attempts; Vehicle stranded in traffic or on roadway
Repairs/costs cited: One owner reported repair cost over $600; details of actual repairs not specified in complaints
Battery discharge and repeated dead battery
The battery repeatedly drains and goes dead, requiring jumps or replacement. Batteries have been replaced multiple times but the problem recurs, suggesting a parasitic electrical drain or charging system issue.
When: No specific mileage reported; one owner mentions below-freezing weather exacerbates the problem
Symptoms owners cite: Battery goes dead without warning; Inconsistent starting behavior (sometimes starts, sometimes does not); Vehicle will not start in cold weather; Battery drains when vehicle is parked
Repairs/costs cited: Battery replaced twice with no resolution; owner carries spare battery and jumper cables to ensure vehicle can be started
Traction control system malfunction causing vehicle lockup
The traction control/ABS system malfunctions, causing the vehicle to lock up or brake unexpectedly, creating a loss of control. The traction warning light illuminates, and the system activates without driver input.
When: Occurs while driving at highway speeds (reported at speeds above 30 mph)
Symptoms owners cite: Traction/ABS warning light illuminates or flashes; Vehicle locks up or brakes suddenly without driver input; Loss of vehicle control at highway speeds; Multiple near-miss collisions reported; Problem occurs only at higher speeds, not in town driving
Codes mentioned: Service SAB system warning
Repairs/costs cited: No repairs detailed in complaints; one owner mentions check engine light came on after unrelated ignition switch repair
Windshield and sunroof water leaks causing electrical shorts
Water leaks into the vehicle through the windshield or sunroof drains, soaking interior floors and triggering electrical shorts. Multiple dealerships confirm this is a widespread issue in the H3.
When: Ongoing; one owner reports issue since August 2014
Symptoms owners cite: Water pooling on interior floors; ABS warning light triggers on and off; Wet floors creating potential electrical hazards; Mechanic unable to locate leak source
Codes mentioned: ABS warning light
Repairs/costs cited: Mechanic was unable to find and fix the leak; multiple dealerships report seeing the same problem in other H3s
Blower motor heater fan failure
The blower motor for the heater/A/C system fails to operate, leaving the vehicle without heat or air conditioning. Wiring harness failures at the connection point are the root cause.
When: Reported around 40,000–85,000 miles
Symptoms owners cite: Blower motor does not operate at all; No heat output from defroster or heating system; No cool air from A/C system; Failure occurs intermittently or completely
Repairs/costs cited: Blower motor and wiring harness replaced; one owner reports the failure recurred after initial repair
Recalls/TSBs owners mention: Recall 15V421000 issued; parts were unavailable
Engine temperature sensor malfunction and rough idle/stalling
The engine temperature sensor sends incorrect signals, causing the engine to run rough, idle poorly, stall at stops, and trigger a low engine temperature diagnostic code. The throttle body or solenoid may also fail.
When: Reported at higher mileages (117,000+ miles)
Symptoms owners cite: Check engine light with low engine temperature code; Rough idle; Vehicle stalls at stops or when slowing down; Engine dies when approaching stop signs or traffic lights; Vehicle overheats
Codes mentioned: Low engine temperature code
Repairs/costs cited: One owner reports throttle body and solenoid replacement; repairs did not permanently resolve stalling issue
Body control module defect
The body control module fails, causing multiple electrical functions to activate or illuminate independently, warning lights to illuminate without reason, and loss of vehicle power.
When: Reported at 112,000+ miles
Symptoms owners cite: Multiple warning indicators illuminate without cause; Electrical functions activate independently; Loss of vehicle power
Repairs/costs cited: Body control module replacement performed
Recalls/TSBs owners mention: Manufacturer notified and referred owner to NHTSA
Seat heater malfunction
The driver's seat heater turns on involuntarily and the seat shifts position during turns or braking, suggesting electrical/mechanical failure in the seat assembly.
When: Reported between 60,000 and 72,000 miles
Symptoms owners cite: Seat heater activates without driver input; Seat shifts position during turns or braking; Failure occurs repeatedly even after dealer repair
Repairs/costs cited: Dealer repaired the issue but failure recurred
Radiator cracking
The radiator develops cracks, causing coolant leaks. Owners and dealerships identify this as a common defect in the 2007 H3.
When: No specific mileage reported
Symptoms owners cite: Coolant leaks; Engine overheating; Low coolant warnings
Repairs/costs cited: Radiator replacement performed; one owner reports cost was included in service work
Synthesized from 72 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
I purchased this 2007 Hummer h3 on june 2016 with 77,000 miles on it. On 11/13/2016 with 80,300+ miles , I experienced the first no start condition due to "passlock theft-deterrent system" indicator blinking when I tried to start the vehicle. I looked up the owners manual on page 100 and it indicated to wait 10 minutes before starting the vehicle again. The vehicle started after waiting for 10…
Had electrical trouble with your 2007 Hummer H3?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2007 Hummer H3?
It's a meaningful issue. 72 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Across the 65 complaints that reported odometer mileage, most electrical failures cluster between 64,000 and 119,400 miles, with the median around 90,000. A quarter of owners report trouble before 64,000; a quarter make it past 119,400. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Hummer/H3.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.