Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0A8D is a Type C DTC.
The engine control module (ECM) will command the charge indicator and or warning message to be illuminated on the instrument panel cluster (IPC) and the driver information center (DIC), if equipped.
The ECM will not illuminate the malfunction indicator lamp (MIL).
The HPCM stores the DTC information in memory when the diagnostic runs and fails.
The APM will shutdown 14V conversions.