Question about 2004 Chevrolet Silverado 2500HD
My 2003 Silverado has done this several times. This happens (at least on my truck) when I switch from any other mode to 2H when the truck is not moving. The front hubs are locked in the engaged position (actually, it locks inside the front differential) when in 4HI, 4LO, or Auto-Trac. When switching to 2HI, the front hubs try to unlock. The mechanism may bind, especially if they haven't been used for months, like during the summer, and don't completely move to the unlocked position. A switch tells the controller when unlocked, but doesn't always get triggered when the hubs don't get completely disengaged. Usually cycling between 2HI and Auto-Trac while driving will free up the hubs and make prevent the problem of all 4 lights coming on at once. Turning the engine off and then restarting it will usually correct the problem with all 4 lights lit at the same time by resetting the transfer case controller. Then, you will be able to switch from 2HI to Auto-Trac and back to 2HI while driving, as described above, to free up the mechanism. If this doesn't fix it, you will likely have to replace the switch in the front differential that tells when the hubs are completely disengaged, or, more likely, the motor that disengages the hubs/drive axles in the front diff.
Posted on Sep 15, 2009
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Posted on Jan 02, 2017
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