Action Taken When the DTC Sets

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

P1A8B

DTC P1A8B is a Type C DTC.
The HPCM stores the DTC information in memory when the diagnostic runs and fails.

P1A8C

DTC P1A8C is a Type C DTCs.
The HPCM stores the DTC information in memory when the diagnostic runs and fails.
The APM will shut down 42-volt conversion.