P0730 on Infiniti
Incorrect Gear Ratio
P0730 on Infiniti vehicles indicates incorrect gear ratio. Au7o has documented this code across 1 Infiniti model — most commonly on QX70. 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. Typical repair costs on Infiniti range from $300 to $3,500, depending on the specific model and root cause.
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 Infiniti by Model
Infiniti QX70(1 issue)
- Seven-Speed Automatic Rough Shifting, Delayed Engagement, and Low-Speed Shudder2014-2017
The QX70's RE7R01A seven-speed automatic draws consistent owner complaints for delayed engagement when selecting drive or reverse, rough or clunky shifts between the lower gears, and a shudder felt during light acceleration at low speed. The transmission is generally durable, and most of these complaints trace to fluid condition and to the torque converter lock-up clutch rather than to hard parts: the factory positions the fluid as lifetime fill, which it is not, and degraded fluid makes the converter clutch chatter as it modulates. Left in service long enough, shudder that started as a fluid problem does become a converter problem.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Infiniti?▼
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 Infiniti specifically, this code is documented across 1 model.
What causes P0730 on Infiniti vehicles?▼
Common causes on Infiniti: 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 Infiniti?▼
Repair costs on Infiniti range from $300 to $3,500, depending on the specific model and root cause.
Which Infiniti models have P0730 documented?▼
Au7o has documented P0730 on 1 Infiniti model: QX70.