2009 Silverado 1500 5.3L P0521

Asked by Nov 16, 2019 at 09:02 PM about the 2009 Chevrolet Silverado 1500

Question type: Maintenance & Repair

2009 Silverado 1500 5.3L P0521

Old pressure sensor quite entirely so I replaced it
with a new one. Drove around for 20 - 30 minutes
testing it out. 659 rpm idle the gauge shows 18 psi
warm. 34 psi at 1500 rpm warm and 38 psi at idle
cold. The check engine light came back on P0521
but didnt tell me to shut vehicle of this time.
Replaced that one with the same model under
lifetime warranty and having the same psi in each
category. I'm at a loss. Any help would be much
appreciated.

Vehicle has 73k miles on it

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