P0305High urgency
Cylinder 5 Misfire Detected
Powertrain · Ignition System
⛔ Stop driving if the check engine light is flashing — catalytic converter damage risk. Steady light: drive cautiously to a shop.
What this means
The ECU has detected a misfire occurring specifically in Cylinder 5. Common on V6 and V8 engines.
Likely causes
- Worn or fouled Cylinder 5 spark plugMost common
- Failed Cylinder 5 ignition coilMost common
- Clogged or leaking Cylinder 5 injectorCommon
- Low compression in Cylinder 5Less common
Estimated repair cost
Spark plug$20 – $80
Ignition coil$60 – $200
Fuel injector$150 – $400
Compression diagnosis$100 – $300
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Frequently asked questions about P0305
What does P0305 mean?
The ECU has detected a misfire occurring specifically in Cylinder 5. Common on V6 and V8 engines.
Is P0305 serious?
Stop driving if the check engine light is flashing — catalytic converter damage risk. Steady light: drive cautiously to a shop.
How much does it cost to fix P0305?
Repair costs for P0305 range from $20 – $80 depending on the root cause and your vehicle.
Can I drive with P0305?
No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.