Hello, this is an "air - fuel imbalance for bank 1". This means that there's a specific concern with bank one alone, if that's the only code. Measure your fuel trims with a diagnostic tool. What do you see, in comparison to bank 2? You'll need a good diagnostic tool to accomplish this.
Are you using original equipment General Motors parts?
Check wiring, check connections. Think specific to bank 1 -- what could be a concern?
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