P0302 on Genesis
Cylinder 2 Misfire Detected
P0302 on Genesis vehicles indicates cylinder 2 misfire detected. Au7o has documented this code across 2 Genesis models — most commonly on G70, GV80. This code means the engine computer has detected a misfire specifically in cylinder 2, meaning that cylinder isn't completing combustion properly on some firing events. The computer watches tiny variations in crankshaft speed to spot when a cylinder fails to fire, and a misfire means the air-fuel mixture isn't igniting correctly — usually from a spark, fuel, or compression problem in that cylinder. You may feel a stumble, rough idle, shaking, loss of power, or a flashing check-engine light, and persistent misfires can damage the catalytic converter. Because it names a single cylinder, the fault is often a component serving just cylinder 2, like its coil, plug, or injector. Typical repair costs on Genesis range from $400 to $900, depending on the specific model and root cause.
Common Causes of P0302
- •Worn or fouled spark plug (cylinder 2)
- •Failed ignition coil or coil-on-plug (cylinder 2)
- •Clogged or faulty fuel injector (cylinder 2)
- •Vacuum or intake air leak affecting that cylinder
- •Low compression (worn rings, burnt/bent valve, head gasket)
- •Damaged spark plug wire or boot (if equipped)
- •Carbon-tracked or cracked coil/plug causing spark loss
- •Faulty PCM/ECM driver (rare)
P0302 on Genesis by Model
Genesis G70(1 issue)
- GDI Intake-Valve Carbon Buildup (Misfires, Rough Idle)2019-2024
Like most gasoline direct-injection engines without supplemental port injection, the G70's 2.0T and 3.3T accumulate carbon on the backs of the intake valves over time because no fuel washes them. Owners report heavy valve coking by ~24,000 miles in some cases, especially when combined with oil consumption. The deposits disrupt airflow and seating, causing rough idle, hesitation, cold-start stumble, and cylinder misfire codes. Removing the intake to walnut-blast the valves is the definitive fix.
Genesis GV80(1 issue)
- 2.5L T-GDI Cold-Start Misfire P0300-P0304 (Service Campaign 914G / TSB 25-01-051G)2021-2024
Theta III 2.5L T-GDI engines in GV80 JX1 (and related G80/GV70) illuminate the Check Engine light with random or specific cylinder misfire codes P0300-P0304 during cold start. Root cause is identified as ECM misfire-detection logic; Genesis issued service campaign 914G covering 2021-2024MY GV80 built 07/27/2020-03/04/2024 for a free ECM reflash.
Looking for P0302 on a different make?
View P0302 across all makes →Frequently Asked Questions
What does P0302 mean on Genesis?▼
P0302 stands for "Cylinder 2 Misfire Detected." This code means the engine computer has detected a misfire specifically in cylinder 2, meaning that cylinder isn't completing combustion properly on some firing events. The computer watches tiny variations in crankshaft speed to spot when a cylinder fails to fire, and a misfire means the air-fuel mixture isn't igniting correctly — usually from a spark, fuel, or compression problem in that cylinder. You may feel a stumble, rough idle, shaking, loss of power, or a flashing check-engine light, and persistent misfires can damage the catalytic converter. Because it names a single cylinder, the fault is often a component serving just cylinder 2, like its coil, plug, or injector. On Genesis specifically, this code is documented across 2 models.
What causes P0302 on Genesis vehicles?▼
Common causes on Genesis: Worn or fouled spark plug (cylinder 2), Failed ignition coil or coil-on-plug (cylinder 2), Clogged or faulty fuel injector (cylinder 2), Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt/bent valve, head gasket). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0302 on a Genesis?▼
Repair costs on Genesis range from $400 to $900, depending on the specific model and root cause.
Which Genesis models have P0302 documented?▼
Au7o has documented P0302 on 2 Genesis models: G70, GV80.