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03 Gm code co327
Hi group had a 03 chevy 2500hd with duramax 85,879 miles that come in with the 4/4 lite coming on sometimes but has no 4/4 problems I thought this might be like the other chevys that the switch is going bad so I looked up tbs and found 03-04-21-0010 it said th... Login to read more. ![]()
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