Possibly good information for you guys

[KentuckyCamper1965]

Ok, I have been having issues with my 2011 Silverado 2500HD. It has been setting the codes P0171, Bank 1 system too lean, and P0174, Bank 2 system too lean.

I checked everything related to these codes. All of my vacuum lines, MAF sensor, O2 sensors, intake leaks, etc. etc. etc.....and having found nothing, I was stumped. I was about ready to throw in the towel and take it to the shop. Yesterday, I changed my oil, and knew having 120K miles on my truck I needed to change the serpentine belt. So I picked one up at the local parts store along with the oil. So when I pulled the tension pulley to replace the belt, Lo and behold, I found my problem.....Due to the tight fit of the plastic air intake assy and the pulley, after the belt had stretched enough, it allowed the pulley to rub a hole in the lower portion. So, if any of you guys experience these codes, start here first. Would be a quick and easy elimination so you wont have to go through pulling your hair out like I did!! LOL....I ordered the part and am awaiting it to come in. So in the meantime, I wrapped the part in 100MPH tape and erased the codes. Took it out on a test drive and rechecked codes. Good to go.

[davester]

Thanks for posting the fix.

[Coby7]

Thank You for this, Just checked mine and idler is like 1/8'' from that water separator, I'm going to order a belt.

[Formulabruce]

Wow, Great Info, and Picture! Thanks for Posting!

[KentuckyCamper1965]

Just an update for any of you guys interested. After replacing the worn piece, my gas mileage increased by 3MPG....I know it doesnt sound like much, but every little bit helps....LOL