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2004-2007 Buick Rainier Service 4WD light illuminated

Condition that some customers intermittent lighting of the Service 4WD light commenting. On research, the technician can find DTC C0374 collection. The customer can also comment about intermittent erratic operation of the 4WD or AWD system after driving through the rain/snow or just going through a car wash. Cause the speed sensor signal have become damaged. Possible openings in the speed sensor wire insulation (twisted pairs) can water ingress. Also, wire connections contaminated by water may result in the short circuits and erroneous speed sensor readings. This most often occurs on the rear speed sensor circuit. Inspect the wiring harness to the transfer case correction speed sensors. Rainier, TrailBlazer, Envoy and 9-7 X models, fabricate a replacement speed sensor harness between the C101 connector and speed sensors. Fully inspect and test all wiring. Refer to speed signal, Front axle actuator and indicators schematic in SI. Replace the affected twisted pairs. The two wires in the harness replacement is not on-twist. Wires must be rotated with a speed of 9 rotations per foot. Connector service pack, P/N 88987993, speed sensor and end terminal, P/N 15326267, C101 use. Terminal testing tools and service terminals can be found in Terminal Repair Kit J 38125. Terminals are available at SPX/Kent-Moore. Call 1-800-GM-TOOLS (1-800-468-6657). The smaller transfer case harness Splitter in the larger chassis armor a few inches of the

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