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Home >> Cadillac >> 2009 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 207 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC P279A >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2009 GMC Yukon, 2009 Chevrolet Tahoe, 2009 Chevrolet Suburban, and 2009 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The engine control module (ECM) monitors the state of the 4WD range 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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