P0730 on Genesis
Incorrect Gear Ratio
P0730 on Genesis vehicles indicates incorrect gear ratio. Au7o has documented this code across 1 Genesis model — most commonly on G90. This code means the transmission computer detected that the actual gear ratio (calculated from input vs. output shaft speeds) does not match what it should be for the commanded gear. In other words, the transmission isn't delivering the correct gear, which often shows up as slipping, flaring RPM during shifts, or being stuck in the wrong gear. It can stem from internal mechanical wear, low or contaminated fluid, or faulty solenoids and sensors. The vehicle may shift harshly or enter limp mode.
Common Causes of P0730
- •Low or contaminated transmission fluid
- •Worn clutches or bands (internal slipping)
- •Faulty shift solenoids
- •Dirty or sticking valve body
- •Faulty input or output speed sensor
- •Internal hydraulic/line pressure problems
- •Torque converter problems
- •General high-mileage transmission wear
P0730 on Genesis by Model
Genesis G90(1 issue)
- 8-speed automatic harsh/jerky upshifts and low-speed lurch (solenoid TSB)2017-2020
Owners report harsh, jerky 2-3, 3-4 and 4-5 upshifts, hesitation and a low-speed lurch/jerk on the 8-speed automatic. A subset of 2018 V6 cars reported the transmission slipping toward Neutral from Drive/Reverse. Hyundai/Genesis issued a TSB attributing harsh upshifts to two shift solenoids that were upgraded.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Genesis?▼
P0730 stands for "Incorrect Gear Ratio." This code means the transmission computer detected that the actual gear ratio (calculated from input vs. output shaft speeds) does not match what it should be for the commanded gear. In other words, the transmission isn't delivering the correct gear, which often shows up as slipping, flaring RPM during shifts, or being stuck in the wrong gear. It can stem from internal mechanical wear, low or contaminated fluid, or faulty solenoids and sensors. The vehicle may shift harshly or enter limp mode. On Genesis specifically, this code is documented across 1 model.
What causes P0730 on Genesis vehicles?▼
Common causes on Genesis: Low or contaminated transmission fluid, Worn clutches or bands (internal slipping), Faulty shift solenoids, Dirty or sticking valve body, Faulty input or output speed sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0730 on a Genesis?▼
Repair costs vary widely depending on the root cause and specific Genesis model.
Which Genesis models have P0730 documented?▼
Au7o has documented P0730 on 1 Genesis model: G90.