Where is the PCV valve located on my 2006 Chevrolet Express 2500 4.8L V8? Dealership says PCV valve should be replaced due to P0174 and P0171 engine codes, which are "System Lean Bank 1 and Bank 2". Regardless of whether the PCV valve fixes the engine code, it's old and should replaced anyway.
How long has your 2006 Chevrolet Express 2500 had this problem?
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It's part of the left valve cover. Requires cover removal.
I would say the PCV valve is highly unlikely to be the cause of these codes.
There is no published "maintenance interval" for the PCV valve on this vehicle. I'd be looking for an unmetered air leak to the intake manifold, honestly.
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