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Home >> GMC >> 2009 >> Yukon Hybrid, RWD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Hybrid Engine Controls - Introduction >> Description and Operation >> Drive Motor Generator Control Module Description and Operation >> Accessory DC Power Control Module (APM) >> Communication and Hosted Diagnostics

Communication and Hosted Diagnostics

The APM has internal diagnostic tests that run at both power-up and during operation. All DTCs from the APM are reported to and hosted by the HPCM. The APM communicates directly only with the HPCM and only on the high speed hybrid GMLAN communication circuit.