P0730 on Genesis: How to Diagnose & Fix
Incorrect Gear Ratio
1 Genesis model · 1 documented issue
P0730 on Genesis by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Harsh/banging upshifts
- Jerk or lurch at low speed
- Shift hesitation/flare
- Momentary slip toward Neutral (some 2018)
- Clunk on acceleration
How to Fix
Have the dealer apply the harsh-shift TSB (upgraded shift solenoids) and perform a transmission adaptive-value reset so the TCM relearns shift points. Verify fluid level/condition. Many owners find Sport mode's shift profile smooths hesitation as an interim workaround.
Sources for this issue (1)
P0730 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0730 mean on a 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 it is documented across 1 model: G90.
What are the most common causes of P0730?
The most common causes of P0730 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0730 on a Genesis?
Repair costs vary widely with the root cause and Genesis model; each issue on this page carries its own estimate where one is published.
Looking for P0730 on a different make?
View P0730 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.