Conditions for Running the DTCs

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Voltage supplied to 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.