2012 GMC Sierra 2500 HD Service & Repair Manual

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🏷️ Basic Information Identification Make: GMC Model: Sierra 2500 HD Year: 2012 Generation Generation Code: GMT900 Generation Years: 2007-2013 👋 Introduction Market Position Positioning: Heavy-duty truck segment, designed for commercial and demanding towing/hauling applications. Competitive Analysis Competitors: Ford F-250 Super Duty, Ram 2500, Chevrolet Silverado 2500 HD (sister model). Key Features Manual Advantage: Officially licensed, OE-derived information from RepairSurge, providing accurate and up-to-date data for DIY and professional use. Vehicle Advantage: Robust construction, powerful engine options for heavy-duty tasks, towing and payload capacity. Manual Value Proposition Value: Cost-effective alternative to dealership service, empowering owners to maintain and repair their vehicle. 📋 Manual Details Coverage Areas Coverage Scope: Complete Service and Repair Page Count Estimated Page Count: Thousands (digital format, comprehensive) Manual Type Type: Online Service and Repair Manual Software Language Language: English Format Format: Web-based/Online Access (via browser) 📖 Manual Coverage Systems Covered Engine Mechanical: All engine assemblies, including internal components, lubrication, cooling, and exhaust systems. Engine Performance: Fuel delivery, ignition, emissions control, starting and charging systems. Transmission Drivetrain: Manual and automatic transmission systems, transfer case, drive axles, propeller shafts, and differentials. Suspension Steering: Front and rear suspension components, steering gear, power steering system, wheel alignment. Brakes: Hydraulic brake systems (front and rear discs/drums), ABS, parking brake, hydraulic control unit. Electrical System: Battery, starting, charging, lighting, instruments, warning indicators, body control module (BCM). HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system components and operation. Body Interior: Body panels, doors, windows, seats, interior trim, glass, and related components. Chassis: Frame construction, collision repair, underbody components. Diagnostic Information: Diagnostic Trouble Codes (DTCs), symptom-based diagnostics, troubleshooting flowcharts. Procedures Included Maintenance Procedures: Oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspections and replacement. Repair Procedures: Component removal, disassembly, inspection, repair, reassembly, and installation for all covered systems. Troubleshooting Guides: Step-by-step...

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Description

🏷️ Basic Information

Identification

Make:

Model:

Sierra 2500 HD

Year:

Generation

Generation Code:

GMT900

Generation Years:

2007-2013

👋 Introduction

Market Position

Positioning:

Heavy-duty truck segment, designed for commercial and demanding towing/hauling applications.

Competitive Analysis

Competitors:

Ford F-250 Super Duty, Ram 2500, Chevrolet Silverado 2500 HD (sister model).

Key Features

Manual Advantage:

Officially licensed, OE-derived information from RepairSurge, providing accurate and up-to-date data for DIY and professional use.

Vehicle Advantage:

Robust construction, powerful engine options for heavy-duty tasks, towing and payload capacity.

Manual Value Proposition

Value:

Cost-effective alternative to dealership service, empowering owners to maintain and repair their vehicle.

📋 Manual Details

Coverage Areas

Coverage Scope:

Complete Service and Repair

Page Count

Estimated Page Count:

Thousands (digital format, comprehensive)

Manual Type

Type:

Online Service and Repair Manual Software

Language

Language:

English

Format

Format:

Web-based/Online Access (via browser)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

All engine assemblies, including internal components, lubrication, cooling, and exhaust systems.

Engine Performance:

Fuel delivery, ignition, emissions control, starting and charging systems.

Transmission Drivetrain:

Manual and automatic transmission systems, transfer case, drive axles, propeller shafts, and differentials.

Suspension Steering:

Front and rear suspension components, steering gear, power steering system, wheel alignment.

Brakes:

Hydraulic brake systems (front and rear discs/drums), ABS, parking brake, hydraulic control unit.

Electrical System:

Battery, starting, charging, lighting, instruments, warning indicators, body control module (BCM).

HVAC:

Heating, Ventilation, and Air Conditioning (HVAC) system components and operation.

Body Interior:

Body panels, doors, windows, seats, interior trim, glass, and related components.

Chassis:

Frame construction, collision repair, underbody components.

Diagnostic Information:

Diagnostic Trouble Codes (DTCs), symptom-based diagnostics, troubleshooting flowcharts.

Procedures Included

Maintenance Procedures:

Oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspections and replacement.

Repair Procedures:

Component removal, disassembly, inspection, repair, reassembly, and installation for all covered systems.

Troubleshooting Guides:

Step-by-step diagnostic procedures for identifying and resolving common and uncommon vehicle faults.

Wiring Diagrams:

Detailed electrical wiring diagrams for all vehicle circuits.

Specifications Data:

Torque specifications, clearances, fluid capacities, pressure readings, and other critical data.

Technical Depth

Depth:

Comprehensive, from routine maintenance to major component overhauls and diagnostics.

Manual Depth Detail

Diagnostic Procedures:

Includes detailed symptom-based troubleshooting, diagnostic trouble code (DTC) explanations, and repair procedures for diagnosing electrical and mechanical faults.

📊 Manual Specifications

File Format

Digital Requirements:

Requires an active internet connection and a compatible web browser on any PC, laptop, smartphone, or tablet.

Print Quality

Print Ability:

While digital, sections can typically be printed for offline reference (quality dependent on user printer).

Binding Type

Binding:

N/A (Digital Online Access)

Paper Type

Paper Type:

N/A (Digital Online Access)

Access Duration

Subscription Period:

1 Year (with discounts available for renewal)

⚙️ Engine Specifications

Primary Engine Gas

Engine Code Gas:

L96 (Vortec 6.0L V8 SFI FlexFuel)

Displacement Gas:

5967 cc (364 cubic inches)

Horsepower Gas:

360 hp @ 5400 rpm

Torque Gas:

380 lb-ft @ 4200 rpm

Fuel System Gas:

Sequential Fuel Injection (SFI), FlexFuel capable.

Block Material Gas:

Cast Iron

Cylinder Head Gas:

Aluminum

Primary Engine Diesel

Engine Code Diesel:

V8DOHC (Duramax 6.6L Turbo Diesel V8 - RPO LML)

Displacement Diesel:

6599 cc (403 cubic inches)

Horsepower Diesel:

397 hp @ 3000 rpm

Torque Diesel:

765 lb-ft @ 1600 rpm

Fuel System Diesel:

High-pressure Common Rail Direct Injection with Turbocharger.

Block Material Diesel:

Cast Iron

Cylinder Head Diesel:

Aluminum

Engine Technology Diesel:

Variable Geometry Turbocharger (VGT), Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR) system (for LML).

🔧 Transmission

Standard

Transmission Type Standard:

Allison 1000 6-speed automatic (with Diesel engines)

Optional

Transmission Type Optional:

ZF S6-650 6-speed manual (less common, typically with gas engine)

Features

Transmission Features:

Heavy-duty construction, Tow/Haul mode, grade braking, electronic transmission range selection (ETRS).

📐 Dimensions

Exterior

Wheelbase Standard:

143.5 inches (3645 mm) (Regular Cab, Long Bed)

Wheelbase Extended:

153.7 inches (3904 mm) (Extended/Crew Cab, Standard Bed)

Wheelbase Longest:

167.5 inches (4255 mm) (Crew Cab, Long Bed)

Weights

Curb Weight Approx:

6,300 - 7,500 lbs (2858 - 3402 kg) (Varies by configuration)

Gvwr Gross Vehicle Weight Rating:

Up to 9,200 lbs (4173 kg) or 10,000 lbs (4536 kg) depending on configuration.

Gcwr Gross Combined Weight Rating:

Up to 22,000 lbs (9979 kg) for diesel models.

🛡️ Safety Features

Ratings

NHTSA Rollover Rating:

4 out of 5 stars (typical for this generation, check specific test data).

Active Features

Active Safety:

StabiliTrak (Traction Control and Electronic Stability Control), Trailer Sway Control, Anti-lock Braking System (ABS).

Passive Features

Passive Safety:

Frontal airbags, Side-impact airbags (optional/standard on some trims), Seatbelt pretensioners.

💡 Technology Features

Infotainment

Infotainment System:

Available touch-screen infotainment systems with navigation, Bluetooth connectivity, and SiriusXM Satellite Radio.

Driver Assistance

Driver Assist Features:

Integrated trailer brake controller (optional), rearview camera (optional).

Connectivity

Connectivity Options:

OnStar capabilities (subscription-based), USB/Auxiliary input jacks.

🔧 Maintenance

Service Intervals

Oil Change Interval:

5,000 miles (8,000 km) for gasoline, 7,500 miles (12,000 km) for diesel, or as indicated by oil life monitor.

Air Filter Replacement:

Every 30,000-50,000 miles (48,000-80,000 km) or as needed based on driving conditions.

Coolant Flush:

Every 50,000 miles (80,000 km) or 5 years for Dex-Cool coolant.

Fluid Specifications

Engine Oil Gas:

SAE 5W-30 (API SN, Dexos1 approved)

Engine Oil Diesel:

SAE 15W-40 (API CJ-4 or CK-4)

Transmission Fluid Auto:

Dexron VI (for Allison 1000)

Coolant Type:

GM P/N 12378515 (Orange Extended Life Coolant / Dex-Cool)

Known Issues

Common Complaints:

Potential for fuel injector issues or EGR problems on older diesel models, some electrical gremlins, and common wear items like ball joints and control arms due to heavy use.

📚 Vehicle History

Brand Heritage

Brand Identity:

GMC (General Motors Company) has a long history of producing trucks and commercial vehicles, emphasizing professional-grade capability.

Model Evolution

Sierra Heritage:

The Sierra nameplate has been used by GMC since 1998, with the 2500 HD representing the heavy-duty iteration of their full-size pickup.

Gmt900 Updates:

The 2012 model year falls within the second generation (GMT900) which received significant updates, including the introduction of the highly capable 6.6L Duramax LML diesel engine and improved styling.

Production

Manufacturing Location:

Fort Wayne, Indiana, USA (Primary Facility)

🏆 Awards & Recognition

Recognitions

Industry Awards:

Consistently ranked highly for towing capacity, durability, and diesel engine performance by automotive publications.