P0308 — Cylinder 8 Misfire Detected

What Does P0308 Mean?

P0308 is a diagnostic trouble code indicating: Cylinder 8 Misfire Detected. This code relates to the ignition system system. It has been reported in NHTSA complaints across 2 different vehicle models.

Symptoms of P0308

⚠️ Check engine light illuminated
⚠️ Rough or unstable idle
⚠️ Loss of engine power
⚠️ Oil leak or excessive consumption

Common Causes

🔍 Worn or fouled spark plugs

P0308 Reports by Year

2024

1

2009

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"LOSS OF POWER WHEN GETTING ON FREEWAY. ENGINE CHUGS, ROUGH IDLE, NO POWER TO MERGE WITH TRAFFIC ON FREEWAY. CHECK ENGINE LIGHT CAME ON. CHECKED CODES AND FOUND P0308 AND P2099. CHANGED ALL 8 SPARK PLUGS, PLUGS 4, 6, 8, 3, 5, AND 7 SHOW SINGS OF SETTING IN WATER. FOUND OUT DODGE HAS TWO SERVICE BULLE"
— Dodge Durango owner, 12/23/2009

"Vehicle lost power, debris in cylinder from internal damage, crank case leaking air, oil leaking into cylinder, P0300, P0308, and P050D"
— Chevrolet Suburban owner, 07/13/2024

Source: NHTSA Complaints Database

Most Reported Vehicles for P0308

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	CHEVROLET SUBURBAN
2	DODGE DURANGO

Frequently Asked Questions

Can I drive with a misfire code?

Driving with active misfires can damage your catalytic converter (a $1,000+ repair). Get it fixed promptly.

Should I replace all ignition coils at once?

Not necessarily. Replace the failed coil, but if your vehicle has 100K+ miles, consider replacing all coils and spark plugs as preventive maintenance.

Will this code come back after repair?

If the root cause is fixed properly, no. However, if only the symptom (e.g., spark plug) is replaced without addressing the underlying issue, it may return.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Replace spark plugs if over 60,000 miles; inspect ignition coils
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0308: Cylinder 8 Misfire Detected