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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Transfer Case - NVG 263-NP1 - Service & Diagnosis) >> Description and Operation >> Transfer Case Description and Operation >> SERVICE Indicator (4WD)

SERVICE Indicator (4WD)

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The SERVICE indicator (4WD) is an integral part of the cluster and cannot be serviced separately. This indicator is used to inform the driver of malfunctions within the automatic transfer case (ATC) system. The SERVICE indicator (4WD) is controlled by the transfer case shift control module via a Class 2 message or by a service indicator control circuit.

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