P0730 on Alfa Romeo
Incorrect Gear Ratio
P0730 on Alfa Romeo vehicles indicates incorrect gear ratio. Au7o has documented this code across 1 Alfa Romeo model — most commonly on 4C. 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 Alfa Romeo 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 Alfa Romeo by Model
Alfa Romeo 4C(1 issue)
- TCT Dual-Clutch Transmission Shudder2015-2020
The Alfa TCT (Twin Clutch Transmission) develops shudder and hesitation at low speeds, particularly during parking maneuvers and stop-and-go traffic. The dry dual-clutch design wears faster under frequent low-speed use.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Alfa Romeo?▼
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 Alfa Romeo specifically, this code is documented across 1 model.
What causes P0730 on Alfa Romeo vehicles?▼
Common causes on Alfa Romeo: 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 Alfa Romeo?▼
Repair costs on Alfa Romeo range from $300 to $3,500, depending on the specific model and root cause.
Which Alfa Romeo models have P0730 documented?▼
Au7o has documented P0730 on 1 Alfa Romeo model: 4C.