The 2003 GMC Sonoma represents the second generation of GMC's compact pickup truck, produced from 1998 to 2004. Built on the GMT355 platform, shared with the Chevrolet S-10, the Sonoma offered a blend of practicality and utility, available in various cab styles and bed lengths. It was designed to cater to a range of needs, from daily commuting to light-duty hauling and towing, with available 4WD providing enhanced capability in challenging conditions. The Sonoma was known for its straightforward operation and the robust performance of its available 4.3L V6 engine, making it a reliable choice in the compact truck segment.

This manual serves as a comprehensive guide for owners and operators of the 2003 GMC Sonoma. It details essential information regarding vehicle operation, routine maintenance, and basic troubleshooting. Key areas covered include instrument cluster interpretation, climate control systems, lighting, locks, safety restraints, and audio systems. Furthermore, the manual provides guidance on engine compartment components, fluid specifications, and common maintenance tasks such as oil changes and tire rotations. Its purpose is to empower users to understand and maintain their vehicle effectively, ensuring longevity and optimal performance.