Circuit/System Description
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.
The Accessory Power Module (APM) continuously monitors its 14-volt circuit during charge or Jump Assist. This DTC sets when the 14-volt circuit in the APM drops below a set level. APM functions will run only when an APM enable message from the Hybrid powertrain control module (HPCM) is active on the high speed hybrid GMLAN communication circuit.