CUSTOMER CONCERN The 12-volt charging system is inoperative and DTCs P0AC4, U0293, and U1817 are stored. CAUSE The Hybrid Powertrain Control Module would not communicate even though its power and ground circuits were present, DLC terminals 6 and 14 measured 60 ohms, and other high-speed GMLAN modules communicated normally. Testing confirmed an internal HPCM/Starter Generator Control Module failure. CORRECTION Remove and replace the Hybrid Powertrain Control Module/Starter Gen

CUSTOMER CONCERN Customer states the 12-volt battery goes dead and the charging system is inoperative. DTCs P1A63, P1A6B, P1A8F, P1A94 and P1AB1 are stored. CAUSE Connector-terminal, power-feed and ground testing confirmed an internal failure of the Starter Generator Control Module. CORRECTION Remove and replace Starter Generator Control Module. Program and configure replacement module. Clear hybrid-system DTCs and verify 12-volt charging operation.