P0305

Q: What does OBD2 code P0305 mean?

P0305 means: Cylinder 5 Misfire Detected. Misfire detected in cylinder 5. Common on V6 and V8 engines where cylinder 5 ignition coil is difficult to access.

Cylinder 5 Misfire Detected

Misfire detected in cylinder 5. Common on V6 and V8 engines where cylinder 5 ignition coil is difficult to access.

SeverityCritical

CategoryEngine

Est. Repair Cost$50–$400

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Worn spark plug
›Failed ignition coil
›Fuel injector issue
›Low compression from worn piston rings

⚠️ Symptoms

›Rough idle
›Hesitation on acceleration
›Reduced engine power
›Check engine light

✅ How to Fix — Step by Step

Step 1:Replace spark plug on cylinder 5
Step 2:Replace ignition coil
Step 3:Test fuel injector
Step 4:Compression test cylinder 5

💡 Pro Tip: On V6 engines cylinder 5 is often on the rear bank — harder to access but same diagnosis process.

Repair Cost Estimate

Full Repair Estimate

$50–$400

DIY Possible?

YES

Severity

Critical

Frequently Asked Questions

What does OBD2 code P0305 mean?+

P0305 stands for Cylinder 5 Misfire Detected. Misfire detected in cylinder 5. Common on V6 and V8 engines where cylinder 5 ignition coil is difficult to access.

What causes code P0305?+

Worn spark plug; Failed ignition coil; Fuel injector issue; Low compression from worn piston rings

How do I fix code P0305?+

Replace spark plug on cylinder 5; Replace ignition coil; Test fuel injector; Compression test cylinder 5

How much does it cost to fix P0305?+

Estimated repair cost for P0305 is $50–$400.

Is P0305 DIY-friendly?+

Yes — P0305 is generally DIY-friendly with basic tools.