2008 Pontiac G8 Service and Repair Manual

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Covers all 2008 G8 trims — Base Sedan 4-Door, GT Sedan 4-Door ·
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2008 Pontiac G8 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.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

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

Trims covered

  • Base Sedan 4-Door
  • GT Sedan 4-Door

Engines covered

  • 3.6L 3564CC 217Cu. In. V6 GAS DOHC Naturally Aspirated
  • 6.0L 5967CC 364Cu. 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
NHTSA #09V17200021/05/2009Component: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE

GM IS RECALLING 35,038 MY 2008-2009 PONTIAC G8 VEHICLES FOR FAILING TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPM

Consequence

INAPPROPRIATE, NON-STANDARD LIGHTS COULD INCREASE THE RISK OF A CRASH OR DRIVING ON A SIGNIFICANTLY

Remedy

DEALERS WILL REPROGRAM THE BRAKE POSITION SENSOR AND THE REMOTE CONTROL DOOR LOCK RECEIVER WITH THE

NHTSA #11V53400004/11/2011Component: AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE-INACTIVE

GENERAL MOTORS (GM) IS RECALLING CERTAIN MODEL YEAR 2008-2009 PONTIAC G8 VEHICLES MANUFACTURED FROM NOVEMBER 2, 2007 THROUGH JANUARY 22, 2009. A 5TH PERCENTILE FEMALE ANTHROPOMORPHIC TEST DEVICE (ATD

Consequence

IN THE EVENT OF A CRASH, THIS DELAY MAY RESULT IN INCREASED HEAD INJURY TO CERTAIN FRONT SEAT OCCUPA

Remedy

GM DEALERS WILL REPROGRAM THE SENSING AND DIAGNOSTIC MODULE FREE OF CHARGE. THE SAFETY RECALL BEGAN

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 #11017783

This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on. Technician will find Diagnostic Trouble Code P2097 or P2099. Technician will nee

TSB #11009531

This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.

Showing the 8 most recent of 294 technical service bulletins on file with NHTSA.

20150204Component: STEERINGCrash reported1 injured

TL* THE CONTACT OWNS A 2008 PONTIAC G8. WHILE DRIVING APPROXIMATELY 50 MPH AROUND A CURVE, THE STEERING WHEEL SEIZED AND CAUSED THE VEHICLE TO CRASH INTO A TREE. THE AIR BAGS DEPLOYED. A POLICE REPORT

20150211Component: ELECTRICAL SYSTEMCrash reported

TL* THE CONTACT OWNS A 2008 PONTIAC G8. WHILE DRIVING AT APPROXIMATELY 35 MPH, THE STEERING WHEEL SEIZED AND THE CONTACT LOST CONTROL OF THE VEHICLE. AS A RESULT, THE CONTACT CRASHED INTO THE MEDIAN S

20150211Component: STEERINGCrash reported

TL* THE CONTACT OWNS A 2008 PONTIAC G8. WHILE DRIVING AT APPROXIMATELY 35 MPH, THE STEERING WHEEL SEIZED AND THE CONTACT LOST CONTROL OF THE VEHICLE. AS A RESULT, THE CONTACT CRASHED INTO THE MEDIAN S

20141126Component: ENGINEFire reported1 injured

I AM INVESTIGATING A FIRE , THE CAUSE OF THE FIRE WAS A 2008 PONTIAC G4. AFTER THE OWNER DROVE THE CAR HE PARKED IT IN HIS GARAGE. WITHIN 20 MIN. OF PARKING THE CAR IT WAS ON FIRE IN HIS GARAGE. THE F

20251009Component: ELECTRICAL SYSTEM

The contact owns a 2008 Pontiac G8. The contact stated that while driving 20 MPH, the key was accidentally bumped, and the ignition switch was knocked out of the run position, turning off the engine.

Showing the 5 most serious of 91 complaints filed with NHTSA.

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