My GMC Sierra 2500 is not going into 4 wheel drive I checked the wire going to the transfer case and it seemed fine what can I do or check please help.
The dash switch itself can be bad. Very common. Easy to change. You can check it by swapping with a friend who has the same switch. Any Sierra, Silverado, Tahoe, Suburban, Yukon, Yukon XL, Avalanche will work as long as it is the same switch. Some are 3 button and others have 4.
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