This manual covers the GMC Sierra 2500HD and 3500HD models manufactured between 2014 and 2016, built on the robust GMT K2XX platform. These heavy-duty pickup trucks are engineered for exceptional towing and payload capacities, featuring durable construction and powerful engine options including the 6.0L V8 Vortec gasoline, 6.6L V8 gasoline, 6.0L V8 Power Stroke Turbo Diesel, and the 6.6L V8 Duramax Turbo Diesel. With a legacy of producing capable and professional-grade vehicles, GMC designed the Sierra HD for demanding commercial applications and owners who require uncompromising performance and reliability.

This comprehensive factory service repair workshop manual provides in-depth technical information essential for the maintenance and repair of your GMC Sierra 2500HD/3500HD. It details procedures for all major vehicle systems, including engine mechanical, fuel, ignition, cooling, lubrication, exhaust, emissions, transmission, suspension, steering, brakes, and electrical systems. The manual also covers HVAC, body and chassis repairs, and offers systematic troubleshooting guides, diagnostic procedures, and component testing instructions. This resource is invaluable for owners, mechanics, and technicians seeking to ensure the longevity and optimal performance of their vehicle.