Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › P0430 code on 2000 GMC Sierra w/ 5.3 V8 › Reply To: P0430 code on 2000 GMC Sierra w/ 5.3 V8 July 18, 2020 at 10:54 am #961438 Richard KirshyParticipant P0430 – Meaning, Causes, Symptoms, & Fixes