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4WD goes into low but not high

schrizoschrizo Posts: 3
edited February 2015 in GMC
Hello. I just bought this truck so don't know its history. But, it will go into 4 low and an indicator shows up on the DIC but when put into 4 high I get no 4WD and no indicator. Any ideas?? I don't get a warning light either. Thanks in advance.
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