⚡ AUTO CODE FIX
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EngineCritical✅ DIY Friendly

P0306

Cylinder 6 Misfire Detected

Misfire in cylinder 6. On V6 engines this is often the rear cylinder, harder to service.

SeverityCritical
CategoryEngine
Est. Repair Cost$50–$400
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Replace spark plug
  • Step 2:Swap ignition coil to confirm
  • Step 3:Test injector
  • Step 4:Compression and leak-down test
💡 Pro Tip: Rear bank cylinders on V6 may require intake manifold removal for proper access.

Repair Cost Estimate

Full Repair Estimate
$50–$400
DIY Possible?
YES
Severity
Critical

Frequently Asked Questions

What does OBD2 code P0306 mean?+
P0306 stands for Cylinder 6 Misfire Detected. Misfire in cylinder 6. On V6 engines this is often the rear cylinder, harder to service.
What causes code P0306?+
Faulty spark plug; Bad ignition coil; Clogged injector; Low compression
How do I fix code P0306?+
Replace spark plug; Swap ignition coil to confirm; Test injector; Compression and leak-down test
How much does it cost to fix P0306?+
Estimated repair cost for P0306 is $50–$400.
Is P0306 DIY-friendly?+
Yes — P0306 is generally DIY-friendly with basic tools.

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