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Message: <blockquote data-quote="speedracer" data-source="post: 27644" data-attributes="member: 15025"><p>Hello all. I have a 2006 chevy silverado 1500 with flex fuel. I am getting P0172 & P0175 codes. When I check my Fuel Composition Pid it shows a value of 50 ~ 55. I select Reset and it goes back to a normal value and the truck runs fine. This code is occurring more and more and starting to become a nuisance. I wait til i have a 1/4 tank,  fill it up then drive at least 10 miles. According to several tech articles I came across, this should stop this from happening but it isn't.  Any suggestion on how to stop this value from changing in the future? Thanks!</p></blockquote><p></p>