Hello I have a 2008 silverado 1500 4×4 5.3L. It was down for around 2 years, because of some surgery’s, with no battery connected. Now that it is running I’ve had to fix a few things. I replaced the complete evap system from clogging, I also had a gas leak so I replaced the fuel pump module.now I keep blowing a p0420 code. I’ve done a few things, but today I tested the fuel pressure & found it was 60 psi running, I know it should be 43 to 45 running.Since the battery was disconnected for 2 years should I try reflashing the PCM just to be safe.
Thank you for a y feedback.
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