This manual covers the GMC Sierra, a full-size pickup truck produced for the 2007 model year. Built on the robust GMT900 platform, the Sierra is engineered for durability and capability, offering diverse powertrain options, including multiple Vortec V8 engines ranging from 4.8L to 6.2L, and automatic transmission choices such as the 4-speed 4L60E/4L70E and 6-speed 6L80/6L90. Its body-on-frame construction and available configurations provide substantial towing and payload capacities, making it a versatile choice for fleet operators, professional technicians, and demanding DIY mechanics. The Sierra is recognized for its strong safety ratings and has been a significant player in the competitive full-size truck market.

This comprehensive Factory Service Manual (FSM) provides detailed, A-Z repair and maintenance information for all GMC Sierra models of this generation. It is designed to assist owners, mechanics, and technicians in understanding, maintaining, and repairing the vehicle. The manual covers all major systems, including engine mechanical and electrical components, transmissions, drivetrain, brakes, suspension, steering, and body systems (interior and exterior). It also includes in-depth diagnostic procedures, troubleshooting flowcharts, maintenance schedules, and complete wiring diagrams, ensuring accurate and efficient service.