Conditions for Running the DTCs

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Voltage at the modules is in the normal operating voltage range.
The vehicle power mode requires serial data communication to occur.
The DTC U2100 does not have a current status.