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Home >> GMC >> 2008 >> Yukon Base, 4.8 C >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Hybrid Engine Control System) >> Description and Operation >> Drive Motor Generator Control Module Description and Operation >> Motor Control Module (MCM) 1 and 2 >> Communication and Hosted Diagnostics

Communication and Hosted Diagnostics

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In addition to the internal SPI bus communication circuit between the HPCM and each MCM, the MCMs also communicate on the Hi-speed and Hybrid GMLAN communication circuits. The MCM does not store its own diagnostic trouble code (DTC) information. The HPCM will store MCM associated DTC information for retrieval by a scan tool. The scan tool can communicate directly with each MCM in order to retrieve data parameters only.

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