Conditions for Setting the DTC: P0659
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The TCM detects an internal short to voltage on high side driver 1 circuit for 3 or more times out of 5 test samples.