2008 GMC Sierra Owners Manual

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🏷️ Basic Information Identification Make: GMC Model: Sierra Year: 2008 Codes Platform: GMT900 👋 Introduction Market Position Segment: Full-size pickup truck Brand Perception: GMC positions the Sierra as a premium,...

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Type: Truck

Vendor:

Sku: 23185

Tags: 2008 Cars GMC Sierra Truck

Product variants

Description

🏷️ Basic Information

Identification

Make:

Model:

Sierra

Year:

Codes

Platform:

GMT900

👋 Introduction

Market Position

Segment:

Full-size pickup truck

Brand Perception:

GMC positions the Sierra as a premium, professional-grade truck.

Competitive Analysis

Key Competitors:

Ford F-150, Dodge Ram 1500, Toyota Tundra

Key Features

Powertrain Options:

Available with multiple V8 engine options and robust chassis for towing and hauling.

Interior Design:

Focus on comfort, durability, and integrated technology for the driver.

📋 Manual Details

Coverage Areas

Primary Coverage:

Owner's Information and Operation

Secondary Coverage:

Basic Maintenance, Safety, and Features

Page Count

Estimated Page Count:

Approximately 400-500 pages (typical for this model year)

Manual Type

Type:

Owner's Manual

Language

Language:

English

Format

Digital Format:

PDF (Portable Document Format)

📖 Manual Coverage

Systems Covered

Powertrain:

Engine operation, fuel system, lubrication, cooling, exhaust (general information)

Chassis:

Braking system, steering system, suspension system (basic operation and checks)

Electrical:

Lighting systems, instrument cluster, entertainment systems, climate controls, power outlets

Body:

Locks and security, seating and safety restraints, windows, mirrors, doors

Procedures Included

Operation:

Starting and operating the vehicle, using vehicle controls and features

Maintenance:

Fluid checks (oil, coolant, brake fluid), tire pressure checks, filter replacement (air), battery maintenance

Safety:

Understanding safety restraints, child seat installation guidance, reporting safety defects (US)

Troubleshooting:

Instrument cluster warning lights and indicators, basic customer assistance procedures

Technical Depth

Depth:

Owner-level understanding and basic operation/maintenance

📊 Manual Specifications

File Format

Compatibility:

Requires PDF reader (e.g., Adobe Acrobat Reader, Foxit Reader)

Print Quality

Quality:

Digital PDF from original factory manual, ensuring high fidelity

Binding Type

Binding:

N/A (Digital Download)

Paper Type

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Code:

LMG (4.8L Vortec V8)

Displacement:

4.8 Liters (293 cubic inches)

Configuration:

V8, Overhead Valves (OHV), 2 valves per cylinder

Horsepower:

Approx. 295 hp @ 5600 RPM

Torque:

Approx. 305 lb-ft @ 4600 RPM

Secondary Engine

Engine Code:

LY5 (5.3L Vortec V8)

Displacement:

5.3 Liters (327 cubic inches)

Configuration:

V8, Overhead Valves (OHV), 2 valves per cylinder, with Active Fuel Management (AFM)

Horsepower:

Approx. 315 hp @ 5200 RPM

Torque:

Approx. 338 lb-ft @ 4400 RPM

Tertiary Engine

Engine Code:

LC8 (6.0L Vortec V8 - typically for heavy-duty models)

Displacement:

6.0 Liters (364 cubic inches)

Configuration:

V8, Overhead Valves (OHV), 2 valves per cylinder

Horsepower:

Approx. 355 hp @ 5400 RPM

Torque:

Approx. 380 lb-ft @ 4200 RPM

Fuel System

Injection:

Electronic Fuel Injection (EFI)

Fuel Information

Fuel Type:

Unleaded Gasoline (87 octane or higher recommended)

🔧 Transmission

Standard

Transmission Type:

4-Speed Automatic (4L60-E based, typically for 4.8L and 5.3L) or 6-Speed Automatic (6L80-E, typically for 5.3L and 6.0L)

Optional

Transmission Type:

6-Speed Manual (less common in this generation, typically for specific configurations)

Features

Drive Type:

Rear-Wheel Drive (RWD) or Four-Wheel Drive (4WD)

Fluid Specifications

Automatic Transmission Fluid:

Dexron VI (GM P/N 88861017 or equivalent)

📐 Dimensions

Exterior

Wheelbase:

Varies by configuration (e.g., approx. 143.5 inches for Crew Cab short bed)

Weights

Curb Weight:

Varies significantly by configuration, typically 4,500 - 5,500 lbs.

🛡️ Safety Features

Ratings

NHTSA Front Driver Side:

5-Star (2008 model year)

NHTSA Front Passenger Side:

5-Star (2008 model year)

NHTSA Side Driver:

5-Star (2008 model year)

NHTSA Side Passenger:

5-Star (2008 model year)

NHTSA Rollover:

4-Star (2008 model year)

Active Features

Standard Anti-lock Braking System

Traction Control:

StabiliTrak Electronic Stability Control (may vary by trim/option)

Passive Features

Airbags:

Driver and front passenger airbags, available side-impact airbags

Seat Belts:

3-point height-adjustable front seat belts with pretensioners, rear seat belts

💡 Technology Features

Infotainment

Audio System:

AM/FM stereo with CD player, auxiliary input jack. Optional Bose premium audio, satellite radio, and in-dash 6-disc CD changer.

Navigation:

Available factory-installed navigation system with touch-screen interface.

Driver Assistance

Parking Assist:

Available rear parking assist sensors.

Connectivity

Remote Start:

Available factory-installed remote vehicle starter system.

Bluetooth:

Available Bluetooth hands-free calling system (RPO code UPF).

🔧 Maintenance

Service Intervals

Engine Oil And Filter:

Every 7,500 miles or 12 months (using synthetic oil and GM filter). Refer to manual for specific oil life monitoring system guidance.

Tire Rotation:

Every 7,500 miles

Air Filter Replacement:

Inspect every 15,000 miles, replace as needed. Replace if dirty. (Part Number likely varies by engine, e.g., ACDelco A1890C for 5.3L)

Cabin Air Filter:

Inspect annually, replace as needed. (Part Number likely varies, e.g., ACDelco CF10168)

Coolant Replacement:

First change at 5 years or 100,000 miles, then every 2 years or 50,000 miles thereafter.

Fluid Specifications

Engine Oil:

SAE 5W-30 Synthetic (GM specification: dexos1 Gen 2 or equivalent)

Engine Coolant:

GM P/N 12346014, Orange Long Life (50/50 mix with distilled water)

Brake Fluid:

DOT 3 (GM P/N 12377974 or equivalent)

Power Steering Fluid:

GM P/N 12345874 or equivalent

Known Issues

Active Fuel Management Lifter Noise:

Some AFM-equipped 5.3L engines can develop lifter noise due to AFM system operation. Regular oil changes with correct oil are critical.

Transmission Hard Shifting:

Some instances of hard shifting or delayed engagement in automatic transmissions, often resolved with fluid service or TCM updates.

Interior Rattles And Squeaks:

Common in many trucks of this era, the manual might offer guidance on identifying and addressing common interior noise sources.

📚 Vehicle History

Brand Heritage

Gmc Truck Legacy:

GMC has a long history of producing trucks for commercial and personal use, emphasizing durability and capability.

Model Evolution

Gmt900 Platform:

The 2008 Sierra is part of the GMT900 platform, introduced for the 2007 model year, featuring a significant redesign with improved aerodynamics, interior quality, and chassis components.

Production

Manufacturing Locations:

Fort Wayne, Indiana; Silao, Mexico; Oshawa, Ontario, Canada

🏆 Awards & Recognition

Recognitions

Jd Power Dependability:

While specific awards vary year-to-year, the GMT900 platform trucks generally performed well in initial quality and long-term dependability studies by J.D. Power and Associates for their segment.