Diagnostic Aids

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the STRTR Fuse 60 (LMM Diesel) or 64 (w/o LMM), ECM-IGN Fuse 56 (LMM) or 58 (w/o LMM), and the 175 A MEGA Fuse for an open.
A misadjusted PNP switch (M30 4L60E, M70 4L70E) or range selector lever cable may result in a starter solenoid does not click condition.