Join Date: Apr 2009
Location: San Bernardino, Ca.
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I had that happen but on another vehicle, not the GTO. I got a similar code on a Lincoln LS that I had cleaned the fuel system out with a pressurized cannister cleaner and Pro Inject-R Kleen, which is a one time solvent rather than an in tank cleaner. The code went away and didn't come back. Might take longer in your case since the stuff will be circulating through your system until you use up that tank of gas. I doubt that you'll need to dial in your fuel again.
2005 Pontaic GTO - CGM 6 Speed (My car)
2017 Chevrolet Colorado 2WT (My daily driver)
2010 Mercedes Benz C300 Sedan (Wife's car)
2014 Kia Rio LX (Wife's daily driver)