Question about Chevrolet Silverado 1500HD
Might be a vacuum leak, might be a loose actuator onthe transfer case, it might be hub not releasing. This last one can be checked by putting vehicle in 4H, then with transmission in neutral, back to 2H, and then back the truck in a straight line about 20 feet. This would release the hubs fully in most cases. If the light goes out, the hubs are getting are worn.
Posted on Feb 15, 2012
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Posted on Jan 02, 2017
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Transfer Case Description and Operation for the Transfer Case - NVG 246-NP8
Transfer Case Description and Operation for the Transfer Case - NVG 261-NP2
Transfer Case Description and Operation for the Transfer Case - NVG 263-NP1
The SERVICE 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and ground of the IPC. The transfer case shift control module controls the service indicator by sending the IPC a Class 2 message. This indicator may be controlled with the scan tool using the IPC device controls.
You should take it to the dealer an have it checked for DTC'S -diagnostic trouble codes
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