2008 Hummer H2 Service and Repair Manual

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Factory-Grade Data

2008 Hummer H2 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Built for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and use wiring diagrams and system sections to diagnose problems faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical coverage with wiring diagrams
  • Coverage across key systems: engine, transmission, brakes, steering, suspension, HVAC, and more

Trims covered

  • Adventure Crew Cab Pickup 4-Door
  • Base Crew Cab Pickup 4-Door
  • Base Sport Utility 4-Door
  • Luxury Sport Utility 4-Door
  • Adventure Sport Utility 4-Door

Engines covered

  • 6.2L 6162CC 376Cu. In. V8 GAS OHV Naturally Aspirated

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2008 Hummer H2 Recalls & Complaints

NHTSA #08V44100028/08/2008Component: ELECTRICAL SYSTEM

GM IS RECALLING 857,735 MY 2006-2008 BUICK LUCERNE; CADILLAC DTS; HUMMER H2; MY 2007-2008 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT; CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE; GMC ACADIA, SI

Consequence

THIS MAY CAUSE OTHER ELECTRICAL FEATURES TO MALFUNCTION, CREATE AN ODOR, OR CAUSE SMOKE INCREASING T

Remedy

DEALERS WILL INSTALL A WIRE HARNESS WITH AN IN-LINE FUSE FREE OF CHARGE. THE RECALL BEGAN ON SEPTEM

NHTSA #10V24000004/06/2010Component: ELECTRICAL SYSTEM

GM IS RECALLING CERTAIN MODEL YEAR 2006-2009 BUICK, LUCERNE; CADILLAC DTS; HUMMER H2; MODEL YEAR 2008-2009 BUICK ENCLAVE; CADILLAC CTS; MODEL YEAR 2007-2009 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE E

Consequence

IT IS POSSIBLE FOR THE HEATED WASHER MODULE TO IGNITE AND A FIRE MAY OCCUR.

Remedy

DEALERS WILL PERMANENTLY DISABLE AND REMOVE THE HEATED WASHER FLUID MODULE. AN UPDATED PAGE FOR THE

TSB #11023091

New Vehicle Monitoring Programs Section in IVH

TSB #11021792

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

TSB #11020816

This PI communicates the requirement to provide a pico file to receive diagnostic assistance from TAC.

TSB #11019074

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.

TSB #11019073

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.

TSB #11019072

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.

TSB #11014455

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 record a sound clip or take a video of the

TSB #11012907

This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.

Showing the 8 most recent of 944 technical service bulletins on file with NHTSA.

20250317Component: POWER TRAIN

P code P0872 6L50/6L80/6L90 - Automatic Transmission

20250317Component: ELECTRICAL SYSTEM

P code P0872 6L50/6L80/6L90 - Automatic Transmission

20250317Component: SERVICE BRAKES

P code P0872 6L50/6L80/6L90 - Automatic Transmission

20210825Component: AIR BAGS

The contact owns a 2008 Hummer H2. The contact stated that the air bag warning light was illuminated on the instrument panel at start up. The next day, the vehicle failed to start up after multiple at

20170109Component: POWER TRAIN

EARLY FAILURE OF 6L80 TRANSMISSION AT 110K MIKES CAR IS WELL MAINTAINED AND SERVICED PER MANUAL. VEHICLE WAS PERFORMING AS EXPECTED. 4 PERSONS IN THE VEHICLE WITH NOTHING IN TOW AND NO EXTRA CARGO. IN

Showing the 5 most serious of 10 complaints filed with NHTSA.

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