P1516 and P2101

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 ignition is ON.
The ignition voltage is more than 8 volts.
The system is not in the Battery Save mode.
The engine is running.
DTC P0068 is not set.
DTCs P1516 and P2101 run continuously when the above conditions are met.