P0306 on Genesis
Cylinder 6 Misfire Detected
P0306 on Genesis vehicles indicates cylinder 6 misfire detected. Au7o has documented this code across 1 Genesis model — most commonly on G70. This code means the engine computer detected a misfire on cylinder 6 — that cylinder isn't burning its fuel-air mixture properly. The computer senses misfires by watching for tiny variations in crankshaft speed each time a cylinder should fire, and when cylinder 6 repeatedly fails to contribute, this code sets. You may feel a shake or stumble, especially at idle or under load, along with reduced power and possibly a flashing check-engine light, which signals a misfire severe enough to damage the catalytic converter. A misfire comes down to a problem with spark, fuel, or compression in that cylinder. Typical repair costs on Genesis range from $300 to $1,500, depending on the specific model and root cause.
Common Causes of P0306
- •Worn or fouled spark plug on cylinder 6
- •Failed ignition coil for cylinder 6
- •Clogged, leaking, or failed fuel injector
- •Vacuum or intake air leak affecting that cylinder
- •Low compression (worn rings, burnt valve, head gasket)
- •Damaged plug wire or coil connector
- •Carbon buildup or worn valvetrain components
P0306 on Genesis by Model
Genesis G70(1 issue)
- 3.3T Oil Consumption with Smoke and Fouled Plugs2019-2023
Some 3.3T owners report elevated engine-oil consumption — in one documented case roughly 2 quarts over a ~320-mile trip, accompanied by bluish exhaust smoke indicating oil burning. The consumed oil contributes to heavy intake-valve carbon (the 3.3T is direct-injected), sooty/wet spark plugs, and multi-cylinder misfire codes. Consumption is intermittent across the fleet (many cars use little to no oil), so owners should monitor levels between changes rather than assume the engine is unaffected.
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View P0306 across all makes →Frequently Asked Questions
What does P0306 mean on Genesis?▼
P0306 stands for "Cylinder 6 Misfire Detected." This code means the engine computer detected a misfire on cylinder 6 — that cylinder isn't burning its fuel-air mixture properly. The computer senses misfires by watching for tiny variations in crankshaft speed each time a cylinder should fire, and when cylinder 6 repeatedly fails to contribute, this code sets. You may feel a shake or stumble, especially at idle or under load, along with reduced power and possibly a flashing check-engine light, which signals a misfire severe enough to damage the catalytic converter. A misfire comes down to a problem with spark, fuel, or compression in that cylinder. On Genesis specifically, this code is documented across 1 model.
What causes P0306 on Genesis vehicles?▼
Common causes on Genesis: Worn or fouled spark plug on cylinder 6, Failed ignition coil for cylinder 6, Clogged, leaking, or failed fuel injector, Vacuum or intake air leak affecting that cylinder, Low compression (worn rings, burnt valve, head gasket). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0306 on a Genesis?▼
Repair costs on Genesis range from $300 to $1,500, depending on the specific model and root cause.
Which Genesis models have P0306 documented?▼
Au7o has documented P0306 on 1 Genesis model: G70.