Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Silverado p0300 code › Reply To: Silverado p0300 code August 18, 2020 at 7:46 am #963112 Richard KirshyParticipant Just a thought … Possibly: Faulty fuel pressure regulator. Faulty cam / crank sensor. Faulty O2 sensor(s) Partially clogged cat