Conditions for Setting the DTC
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
P0ADF
The control circuit voltage is 2 V less than B+ when the negative contactor relay is commanded closed.
P0AE0
The control circuit voltage is within 2 V of B+ when the negative contactor relay is commanded open.