A subscription to ChiltonDIY for the 2006 GMC pickup contains General Motors factory procedures, specifications, technical service bulletins, diagnostics, and more.
Without knowing the engine size, we selected some sample sections to get you started in ChiltonDIY. Use the navigation outline on the left to follow these paths:
PATH: Diagnostics > Vehicle Control Systems > Vehicle DTC Information > Diagnostic Information and Procedures > Strategy Based Diagnosis
PATH: Engine Electrical > 4.8L, 5.3L, 6.0L > Diagnosis & Testing > Electronic Ignition System Diagnosis
PATH: Fuel Systems > 4.8L, 5.3L, 6.0L > Diagnosis & Testing > Fuel System Diagnosis