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what is code u1255 on a 03 yukon xl 1500 5.3 z

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I checked codes on truck and 26 of them came up this was one of them.
c0237,c0222,u1000 5 times,u1255 3 time, c0300, c0305, c0306, c0321, c0327, c0359, c0374, c0379, c0550, b0790, b2725, u1301, p0420 2 times, p0706
Vehicle: 2003,yukon xl 1500,5.3 z

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