GMC Sierra 1500 · Diagnostic Trouble Code
P0303 — Cylinder 3 Misfire Detected
Quick overview of P0303 on your GMC Sierra 1500. Read the full diagnosis guide, then find the repair guides for your vehicle below.
Repair guides that fix P0303
General diagnostic information, not a factory service procedure. If you're unsure, have a qualified technician confirm the diagnosis before buying parts.