2009 Silverado 1500 5.3L P0521

Asked by GuruNSLXD Nov 16, 2019 at 09:04 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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