Diagnostic Trouble Code
P0301 — Cylinder 1 Misfire Detected
Cylinder 1 Misfire Detected
Definition
A misfire has been detected specifically in Cylinder 1. The ECM monitors crankshaft speed variations to identify which cylinder is not producing its expected power contribution.
Common Causes
- Worn or fouled spark plug in Cylinder 1
- Faulty ignition coil on Cylinder 1
- Leaking or clogged fuel injector
- Low compression (worn rings, burned valve)
- Vacuum leak near Cylinder 1 intake runner