Brand Perception:
The HUMMER H2, produced by AM General and later GM, was positioned as an ultra-heavy-duty, luxury off-road SUV, emphasizing its robust construction and intimidating presence, derived from military heritage.
Competitors:
Ford Excursion, Cadillac Escalade EXT, Lincoln Navigator, Land Rover Range Rover
Off Road Capability:
Robust chassis, substantial ground clearance, low-range transfer case, locking differentials (on some models), and aggressive tire options. Featured a 35-degree approach angle, 40-degree departure angle, and 25-degree breakover angle.
Towing Capacity:
High towing capacity, typically rated up to 8,000 lbs.
Interior Appointments:
Luxury-oriented interior with premium materials, spacious seating for up to seven occupants, and advanced features for its time.
Target Audience:
HUMMER H2 owners, independent repair shops, and automotive enthusiasts seeking detailed technical information for maintenance and repair.
Powertrain:
Engine, Transmission, Drivetrain, Exhaust System
Chassis:
Suspension (Front & Rear), Steering, Brakes (ABS, Hydraulic, Electronic), Wheels & Tires
Electrical:
Body Control Module (BCM), Powertrain Control Module (PCM), Lighting, Instrumentation, Audio System, HVAC Controls, Power Accessories, Safety Systems (Airbags, Seatbelts)
Body And Frame:
Exterior Body Panels, Interior Trim, Doors, Windows, Hood, Tailgate, Frame Structure, Bumpers, Seating Systems
Maintenance:
Scheduled Maintenance, Oil Changes, Filter Replacements, Fluid Checks & Replacements, Belt Inspections & Replacement, Spark Plug Replacement
Diagnostics:
Troubleshooting Guides, Diagnostic Trouble Codes (DTCs), Symptom-Based Diagnostics, Wiring Diagrams, Component Testing Procedures
Repair:
Engine Overhaul, Transmission Rebuild, Suspension Component Replacement, Brake System Repair, Electrical Component Diagnosis & Replacement, Body Panel Repair & Replacement, HVAC System Repair
Technical Data:
Torque Specifications, Clearances, Fluid Capacities, Electrical Schematics, Component Removal & Installation Instructions
Diagnostic Capabilities:
Advanced diagnostics including PCM reprogramming, module calibration, and advanced sensor troubleshooting.
Rebuild Procedures:
Comprehensive procedures for complete engine and transmission rebuilds.
Schematic Quality:
Detailed wiring diagrams and system schematics with color coding for clarity.
Engine Type:
Vortec 6.0L V8 (LQ4/LQ9)
Displacement:
5967 cc (364 cubic inches)
Horsepower Early Models:
316 hp @ 4800 rpm
Horsepower Later Models:
325 hp @ 5200 rpm
Torque Early Models:
350 lb-ft @ 4000 rpm
Torque Later Models:
365 lb-ft @ 3600 rpm
Fuel Delivery:
Multi-port Fuel Injection (MPFI)
Fuel Type:
87 Octane Unleaded Gasoline (minimum recommended)
Ignition System:
Distributorless Ignition System (DIS) with Coil-on-Plug (COP) ignition
Engine Control Module:
GM Powertrain Control Module (PCM)
Transmission Type:
4-Speed Automatic
Transmission Model:
4L65-E (Heavy-duty variant of 4L60-E)
Optional Transmission:
N/A (standard across all H2 models within this range)
Transfer Case:
2-Speed Electronic Transfer Case with Lock & Neutral
Gear Ratios 4L65E:
3.06:1 (1st), 1.63:1 (2nd), 1.00:1 (3rd), 0.70:1 (4th)
Transmission Fluid Type:
Dexron III / Dexron VI Automatic Transmission Fluid (ATF)
Transmission Fluid Capacity Quarts:
~12.5 quarts (dry fill)
Curb Weight Lbs:
~6,500 - 7,000 lbs
Gross Vehicle Weight Rating Gvwr Lbs:
~9,200 lbs
Towing Capacity Lbs:
Up to 8,000 lbs
Payload Capacity Lbs:
~1,500 - 2,000 lbs
Passenger Volume Cu Ft:
~116.2 cu ft
Cargo Volume Behind 3Rd Row Cu Ft:
~45.8 cu ft
Cargo Volume Behind 2Nd Row Cu Ft:
~85.8 cu ft (with 3rd row removed or folded)
Standard Wheel Size:
17 inch (Aluminum)
Standard Tire Size:
315/70R17
Bolt Pattern:
8 x 165 mm (8 x 6.5 inches)
NHTSA Rollover Resistance Rating:
3/5 stars (often cited due to high center of gravity)
ABS:
Standard Anti-lock Braking System (ABS)
Traction Control:
Standard Traction Control System (TCS)
Airbags:
Frontal airbags for driver and passenger, side-impact airbags (optional or standard depending on trim/year)
Seatbelts:
3-point seatbelts with pretensioners
Structure:
Heavy-duty steel frame and body construction designed for robustness.
Infotainment System:
Optional premium audio system, CD player, and navigation systems were available.
Display Type:
Center console display for climate control, audio, and optional navigation.
Cruise Control:
Standard cruise control.
Parking Assist:
Optional rear parking assist sensors.
Onstar:
Optional OnStar communication system available for emergency services, turn-by-turn navigation, and vehicle diagnostics.
Oil Change Interval Miles:
Every 7,500 miles or 6 months (whichever comes first), under normal driving conditions.
Engine Coolant Flush Interval Miles:
Every 100,000 miles or 5 years.
Transmission Fluid Change Interval Miles:
Every 50,000 - 100,000 miles, depending on driving conditions (towing/severe duty requires more frequent changes).
Spark Plug Replacement Miles:
Approximately 100,000 miles (depending on specific plug type).
Engine Oil Specification:
SAE 5W-30 Synthetic Blend (API Certified)
Engine Oil Capacity Quarts:
~6.0 quarts (with filter change)
Coolant Type:
Dex-Cool (Orange) Long-Life Coolant
Brake Fluid Type:
DOT 3 or DOT 4
Power Steering Fluid Type:
GM Power Steering Fluid or Dexron III/VI ATF
Air Suspension Components:
Early models may experience premature wear of air springs and associated components.
Fuel Pump Assembly:
Potential for fuel pump module failure or leaks.
Throttle Position Sensor:
Intermittent performance issues related to throttle position sensor failure.
Transfer Case Actuator:
Failure of the electronic transfer case actuator can lead to engagement issues.
Am General Legacy:
HUMMER's roots trace back to the AM General HMMWV (High Mobility Multipurpose Wheeled Vehicle), providing a military-inspired aesthetic and capability.
H1 To H2 Transition:
The H2 was conceived as a more accessible and consumer-friendly version of the H1, building on its off-road prowess while incorporating more luxury and modern amenities.
Production Period:
2003-2009 (for H2 model line); manual covers 2003-2007.
Manufacturing Plant:
AM General's Mishawaka, Indiana plant
Gm Acquisition:
General Motors acquired the HUMMER brand and production from AM General in 1999, leading to the development and marketing of the H2.
Popular Mechanics Car Of The Year Off Road:
The H2 was recognized by Popular Mechanics as a Car of the Year in the Off-Road category shortly after its launch.
Fuel Economy Ratings:
EPA estimated MPG: ~9 city / ~13 highway (typically, reflecting its heavy-duty nature and large engine).
Emissions Compliance:
Meets relevant EPA and California Air Resources Board (CARB) emissions standards for its model years.
