🏷️ Basic Information Identification Make: GMC Model: Sonoma Year: 2003 Codes Platform: GMT355 👋 Introduction Market Position Target Audience: DIY enthusiasts, independent repair shops, dealership technicians Key Features Authenticity: Vehicle-specific, not generic; same as used by dealership technicians Convenience: Single, easy-to-use PDF; no flipping through books; printable pages Durability: No greasy or torn pages; safe on PC Comprehensiveness: Covers all models and repairs A-Z 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Scope: All Models, All Repairs A-Z Manual Type Type: Factory Service Manual (FSM) Language Language: English Format Format: PDF Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac Page Count Estimated Page Count: Comprehensive (exact count not specified, but implied to be extensive) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine, Control System, Fuel Service Specifications, Emission Control, Intake Exhaust Cooling, Lube, Ignition Starting Charging Drivetrain: Auto Transmission, Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension Chassis And Brakes: Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering Body And Interior: Air Condition, Suppl Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/ Door, Exterior & Interior Electrical And Electronics: Electrical, Multiplex/ CAN Communication Procedures Included Maintenance: Scheduled Maintenance, Fluid Checks and Changes, Filter Replacements Diagnostics: Troubleshooting Guides, Diagnostic Trouble Codes (DTCs), Symptom-Based Diagnosis Repair: Step-by-step repair instructions for all covered systems and components Installation: Installation procedures for specific components and systems Technical Depth Depth: Complete Service and Repair - Equivalent to dealership technician level Content Type: Step-by-step instructions, diagrams, illustrations, wiring schematics, specifications 📊 Manual Specifications File Format File Type: PDF Searchability: Likely searchable text within PDF (standard for quality manuals) Print Quality Printability: All pages printable Image Scaling: Images can be blown up and printed enlarged Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Type: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Options 2003: 2.2L L4 Ecotec (VIN G), 3.5L L5 Vortec 3500 (VIN X), 4.3L V6 Vortec 4300 (VIN Z) Performance Hp 2.2L L4: approx. 130-140 hp Torque 2.2L L4: approx. 135-140 lb-ft Hp 3.5L L5: approx. 200-205 hp Torque 3.5L L5: approx. 225-230 lb-ft Hp 4.3L V6: approx. 180-190 hp Torque 4.3L V6: approx. 245-250 lb-ft Fuel System Fuel Delivery: Multi-port Fuel Injection (MPFI) Fuel Type: Unleaded gasoline 🔧 Transmission Standard Standard Transmission: 5-Speed Manual (NV1500/NV3500 for 2.2L and 4.3L) Optional Optional Transmission: 4-Speed Automatic (4L60-E for 3.5L and 4.3L) Features Drivetrain Options: 2WD (Rear Wheel Drive), 4WD (Four Wheel Drive) Transfer Case: Available with electronic shift 4WD system 📐 Dimensions Exterior Body Styles: Regular Cab, Extended Cab Bed Lengths: Short Bed (6'1"), Long Bed (7'4") Weights Curb Weight Range: Approx. 3,400 - 4,000 lbs (depending on configuration) Max Payload Capacity: Up to approx. 1,500 lbs (depending on configuration) Max Towing Capacity: Up to approx. 5,000 - 5,500 lbs (depending on configuration and engine) 🛡️ Safety Features Ratings NHTSA Front Crash Test Driver: 4/5 Stars (for 2003 models, general rating for similar vehicles) NHTSA Front Crash Test Passenger: 4/5 Stars (for 2003 models, general rating for similar vehicles) Active Features ABS: Anti-lock Braking System (ABS) standard on all models Traction Control: Available Traction Control System (TCS) Passive Features Airbags: Driver and Passenger Airbags Seat Belts: 3-point seat belts with pretensioners 💡 Technology Features Infotainment Audio System: AM/FM stereo with CD player, optional cassette, and premium sound systems Display: Digital odometer, analog gauges Driver Assistance Cruise Control: Standard on many trims, available on others Connectivity Remote Keyless Entry: Available feature Lighting: Halogen headlamps, available fog lamps 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific interval based on driving conditions (e.g., 3,000-7,500 miles or 6 months) Air Filter Replacement: Refer to manual, typically 15,000-30,000 miles Spark Plug Replacement: Refer to manual (e.g., 60,000-100,000 miles for Ecotec and Vortec engines) Fluid Specifications Engine Oil Type: Refer to manual for specific viscosity (e.g., SAE 5W-30 for many engines) Engine Oil Capacity: Refer to manual (e.g., approx. 4.5-5.5 quarts depending on engine) Transmission Fluid Type Auto: Dexron-VI or equivalent (check manual for specific spec for 4L60-E) Transmission Fluid Type Manual: GL-4 or GL-5 gear oil (refer to manual for specific weight) Coolant Type: Orange/Pink silicate-free long-life coolant (GM P/N 12346290 or equivalent) Known Issues Common Wear Items: Ball joints, tie rod ends, wheel bearings, sway bar links due to truck usage Engine Specific: Potential for oil leaks (e.g., valve cover gaskets, oil pan gaskets), intake manifold gasket leaks on some V6 models Electrical: Intermittent electrical issues related to body control modules or sensors 📚 Vehicle History Brand Heritage Brand Lineage: GMC, known for trucks and professional-grade vehicles Model Evolution Generation: Second Generation (2000-2004), introduced on the GMT355 platform Design Updates: Redesigned for this generation with updated...