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P0308

Cylinder 8 Misfire Detected

Misfire detected in cylinder 8. Common on V8 trucks and performance engines.

SeverityCritical
CategoryEngine
Est. Repair Cost$60–$450
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

  • ›Fouled spark plug
  • ›Coil pack failure
  • ›Fuel injector issue
  • ›Compression loss

⚠️ Symptoms

  • ›Engine shaking
  • ›Check engine light
  • ›Poor acceleration
  • ›High fuel consumption

✅ How to Fix — Step by Step

  • Step 1:Replace spark plug
  • Step 2:Replace ignition coil
  • Step 3:Test fuel injector pulse
  • Step 4:Compression test

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0308 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Consider replacing all 8 spark plugs if mileage is over 60,000 miles.

Repair Cost Estimate

Full Repair Estimate
$60–$450
DIY Possible?
YES
Severity
Critical

Frequently Asked Questions

What does OBD2 code P0308 mean?+
P0308 stands for Cylinder 8 Misfire Detected. Misfire detected in cylinder 8. Common on V8 trucks and performance engines.
What causes code P0308?+
Fouled spark plug; Coil pack failure; Fuel injector issue; Compression loss
How do I fix code P0308?+
Replace spark plug; Replace ignition coil; Test fuel injector pulse; Compression test
How much does it cost to fix P0308?+
Estimated repair cost for P0308 is $60–$450.
Is P0308 DIY-friendly?+
Yes — P0308 is generally DIY-friendly with basic tools.

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