Conditions for Setting the DTC

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Voltage at the TDM B+ circuit is between 6-9 volts.
Reported battery voltage received via serial data is valid and is greater than 9 volts.
The above conditions have been met for 2 seconds.