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Home >> Cadillac >> 2014 >> Escalade Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC P279B: Four Wheel Drive (4WD) Low Range Performance >> 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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