Your 2022 Genesis GV80 represents Korean luxury at its finest—so experiencing a check engine light with rough idle disrupts the premium experience you expect. Code P0300 indicates random or multiple cylinder misfires, pointing toward systemic issues in this sophisticated luxury SUV.
Understanding P0300 in the GV80
The GV80 offers either a 2.5L turbocharged four-cylinder or 3.5L twin-turbo V6. Both are direct-injection turbocharged engines where P0300 indicates multiple cylinders are experiencing combustion failures—not a single-cylinder problem.
Symptoms Beyond the Light
- Rough, uneven idle noticeable in the quiet cabin
- Vibration at stops
- Hesitation during acceleration
- Possible fluctuating RPM
- Reduced power and fuel economy
Primary Causes
Ignition System Issues
Spark plugs and coils work harder in turbocharged engines. Failure of multiple components or marginal performance across the ignition system causes random misfires.
Fuel System Problems
Direct injection systems can develop carbon deposits on injector tips or experience delivery issues affecting all cylinders.
Vacuum/Boost Leaks
Any leak in the intake system creates unmetered air affecting air-fuel mixture across the entire engine.
Fuel Quality
Contaminated fuel or incorrect octane affects combustion efficiency in all cylinders.
Repair Costs
| Repair | Parts | Labor | Total |
|---|---|---|---|
| Spark plugs (2.5T - 4) | $80-$150 | $150-$250 | $230-$400 |
| Spark plugs (3.5T - 6) | $120-$220 | $200-$350 | $320-$570 |
| Ignition coils | $200-$400 | $150-$300 | $350-$700 |
| Fuel injector cleaning | $50-$100 | $100-$175 | $150-$275 |
Warranty Consideration
Your 2022 GV80 should still be covered under Genesis's 5-year/60,000-mile basic warranty and 10-year/100,000-mile powertrain warranty.