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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 338 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC P279B >> Circuit/System Description

Circuit/System Description

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The engine control module (ECM) monitors the state of the 4WD signal message, if equipped, over the GMLAN communication bus. The ECM uses this message to determine motor torque required and transmission shifting. There are no external circuits involved.

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