🏷️ Basic Information Identification Make: GMC Model: Sierra 2500 Year: 2003 Vehicle Type: Heavy-Duty Pickup Truck Generation Generation: Second Generation (GMT800) Codes Platform Code: GMT800 👋 Introduction Market Position Positioning: Essential diagnostic and repair resource for owners and independent repair facilities of the 2003 GMC Sierra 2500. Competitive Analysis Comparison To Print: Offers superior searchability, instant access, and up-to-date information compared to outdated printed manuals. Key Features Licensing: Officially licensed, derived from OE (Original Equipment) materials. Developer: RepairSurge Cost Savings: Enables significant cost savings by empowering users to perform their own repairs. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Page Count Estimated Page Count: Thousands (software format) Manual Type Manual Type: Digital Service and Repair Manual Software Language Language: English Format Format: Online Access (Web Browser Compatible) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete diagnostics, repair, and overhaul of all available engines. Engine Electrical: Ignition system, fuel injection, starting and charging systems, emissions controls. Transmission Manual: Service and repair procedures for manual transmissions. Transmission Automatic: Diagnostics, repair, and overhaul for automatic transmissions (e.g., 4L80-E). Drivetrain: Front and rear axle service, propeller shafts, differentials, transfer case (if applicable). Brakes: Hydraulic brake system, ABS diagnostics and repair, brake component replacement (pads, rotors, calipers, lines). Suspension: Front and rear suspension components, shock absorbers, ball joints, control arms, steering linkage. Steering: Power steering system, steering gear/rack, steering column, wheel alignment specifications. Body And Frame: Body panel repair, doors, glass, interior trim, frame diagnostics and repair. Electrical System: Wiring diagrams, component testing, fuses, relays, lighting system, comfort and convenience features. HVAC: Heating, ventilation, and air conditioning system diagnostics and repair. Chassis Electrical: Trailer lighting, trailer brake controller integration, auxiliary power outlets. Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and top-offs, tire rotation, spark plug replacement. Diagnostics: Troubleshooting guides for common symptoms and DTC (Diagnostic Trouble Codes). Repair: Step-by-step instructions for component replacement and repair. Rebuilds: Complete engine and transmission rebuild procedures with detailed specifications. Wiring Diagrams: Comprehensive electrical schematics for all vehicle systems. Torque Specifications: Detailed torque values for all critical fasteners. Technical Depth Depth: Factory-level technical information, suitable for professional technicians and advanced DIY enthusiasts. 📊 Manual Specifications File Format File Type: Proprietary Software (Browser-based Access) Print Quality Print Quality: N/A (Digital Format) Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) Accessibility Device Compatibility: PC, Laptop, Smartphone, Tablet Access Duration Access Period: 1 Year (with option for renewal) ⚙️ Engine Specifications Primary Engine Engine Option 1: 6.0L V8 Vortec 6000 (LPG-based variations may exist for specific commercial applications) Engine Option 2: 8.1L V8 Vortec 496 (Big Block) Engine Option 3: 6.6L V8 Duramax Turbo-Diesel (LB7) Performance 6.0L Horsepower 6.0L: 300 hp @ 4400 rpm (approx.) Torque 6.0L: 360 lb-ft @ 4000 rpm (approx.) Performance 8.1L Horsepower 8.1L: 340 hp @ 4000 rpm (approx.) Torque 8.1L: 455 lb-ft @ 3200 rpm (approx.) Performance Duramax Horsepower Duramax: 300 hp @ 3100 rpm (approx.) Torque Duramax: 520 lb-ft @ 1600 rpm (approx.) Fuel System Fuel System Type Gas: Sequential Multi-Port Fuel Injection (MPFI) Fuel System Type Diesel: Common Rail Direct Injection (CRDI) with High-Pressure Fuel Pump Engine Code Duramax Engine Code Duramax: LB7 🔧 Transmission Standard Standard Transmission: 5-Speed Manual (NV4500, typically with 6.0L gas) Optional Optional Transmission Gas: 4-Speed Automatic (4L80-E) Optional Transmission Diesel: 5-Speed Automatic (Allison 1000) Features Drivetrain Options: Rear-Wheel Drive (RWD) or Four-Wheel Drive (4WD) 📐 Dimensions Exterior Cab Cab Configurations: Regular Cab, Extended Cab (Crew Cab may be available on 2500HD variants) Exterior Bed Bed Lengths: Standard Bed (approx. 78.7 inches), Long Bed (approx. 97.6 inches) Weights Gvwr Range: Varies by configuration, typically 8,600 lbs to 10,000 lbs+ Curb Weight: Varies significantly based on engine, cab, and drivetrain (e.g., 6,000 - 7,500 lbs) Towing Capacity: Up to 12,000+ lbs (depending on configuration and trailering package) 🛡️ Safety Features Ratings NHTSA Front Impact: Good (typically for driver and passenger in frontal impacts) NHTSA Side Impact: Good (typically for front and rear occupants in side impacts) Active Features Anti Lock Brakes: Standard 4-wheel ABS Passive Features Airbags: Driver and front passenger airbags 💡 Technology Features Infotainment Infotainment System: Basic AM/FM radio with CD player, optional premium sound systems, and steering wheel mounted controls. Driver Assistance Cruise Control: Standard cruise control functionality. Connectivity Ancillary Options: Optional trailer brake controller, auxiliary input for audio devices. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 miles or 3-6 months (depending on driving conditions and oil type). Engine Coolant Flush: Every 30,000 miles or 2 years (Dex-Cool coolant recommended). Transmission Fluid Change: Every 30,000-60,000 miles for automatic transmissions, depending on towing and load. Fluid Specifications Engine Oil 6.0L: API SN/SP, SAE 5W-30 (check manual for specific viscosity) Engine Oil 8.1L: API SN/SP, SAE 5W-30 or 10W-30 (check manual for specific viscosity) Engine Oil Duramax: API CJ-4...