2005 Genesis P0300: What It Means & Is It Safe to Drive?
P0300 on the 2005 Genesis: Random/Multiple Cylinder Misfire Detected. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
The PCM has detected misfires across multiple cylinders. This can cause damage to the catalytic converter if driven for long.
Common causes on the 2005 Genesis
- Worn spark plugs or ignition coils
- Clogged or bad fuel injectors
- Low compression
- Vacuum leak, bad MAF, or fuel delivery issue
Symptoms
- Check Engine Light (often flashing under load)
- Rough idle, shaking, loss of power
- Possible smell of unburned fuel
Typical fixes
- Replace spark plugs and coils as needed
- Clean or replace fuel injectors
- Fix vacuum/fuel issues
- Compression test if no obvious cause
Repair cost range
For a 2005 Genesis, repairs for P0300 typically fall between $150 and $1200, depending on the root cause and labor rates in your area.
Known issues on Genesis
Genesis P0300 on Lambda II V6 and Theta-III 4-cylinder engines is relatively uncommon but occurs from ignition coil failure or carbon buildup in GDI units. Diagnosis follows Hyundai/Kia procedures—check coils, plugs, and fuel trim before condemning injectors.
Most commonly affected models
G80 2017–2022G70 2019–2022GV80 2021–2022