Conditions for Running the DTCs

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.

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.