2008 Hummer H3 Service and Repair Manual

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Factory-Grade Data

2008 Hummer H3 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

  • X Sport Utility 4-Door
  • Base Sport Utility 4-Door
  • Luxury Sport Utility 4-Door
  • Adventure Sport Utility 4-Door
  • Alpha Sport Utility 4-Door

Engines covered

  • 3.7L 3654CC 223Cu. In. l5 GAS DOHC Naturally Aspirated
  • 5.3L 5328CC 325Cu. 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 H3 Recalls & Complaints

NHTSA #10V17900030/04/2010Component: STRUCTURE:BODY:HOOD

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 HO

Consequence

IF THE VEHICLE IS BEING DRIVING WHEN THIS OCCURS, IT COULD STRIKE A FOLLOWING VEHICLE AND CAUSE INJU

Remedy

DEALERS WILL APPLY AN ADHESIVE TO THE HOOD LOUVER TO SECURE IT TO THE HOOD. THIS SERVICE WILL BE PE

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 #11017252

This service bulletin provides information for dealers/technicians on OnStar Module 2G Sunset Information.

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

Showing the 8 most recent of 909 technical service bulletins on file with NHTSA.

20121130Component: AIR BAGSCrash reported1 injured

I WAS DRIVING IN VERY THICK FOG WHICH WAS A WHITE OUT. I WAS GOING THROUGH A TURN AND WAS LOST IN THE FOG QUICKLY AND I ENDED UP OFF THE SIDE OF THE ROAD STRUCK A SPEED LIMIT SIGN AND A UTILITY POLE O

20150826Component: ELECTRICAL SYSTEMCrash reported

AN ODOR SMELL OF BAKED, COOKED, MELTED, CHARED, SCORCHED, AND ROASTED ELECTRICAL WIRES AND HAVE HAD TO TWICE REPLACE THE GENERAL MOTORS, HARNESS, 25949869, AND ACDELCO 15-80647 GM ORIGINAL EQUIPMENT H

20091210Component: SUSPENSION:FRONTCrash reported

I HAVE A 2008 HUMMER H-3. ON NOVEMBER 3RD 2009 WHILE DRIVING ABOUT 30 MILES AN HOUR ON A SHARP LEFT CURVE, THERE WAS A LOUD CLUNK IN THE FRONT END AND THE TRUCK PULLED HARD TO THE RIGHT MAKING THE VEH

20091210Component: STEERINGCrash reported

I HAVE A 2008 HUMMER H-3. ON NOVEMBER 3RD 2009 WHILE DRIVING ABOUT 30 MILES AN HOUR ON A SHARP LEFT CURVE, THERE WAS A LOUD CLUNK IN THE FRONT END AND THE TRUCK PULLED HARD TO THE RIGHT MAKING THE VEH

20221007Component: ELECTRICAL SYSTEMFire reported

The contact owns a 2008 Hummer H3. The contact stated that upon shifting into drive (D) or reverse (R) the doors of the vehicle would unlock automatically. There was no warning light illuminated. The

Showing the 5 most serious of 154 complaints filed with NHTSA.

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