P0730 on Cadillac
Incorrect Gear Ratio
P0730 on Cadillac vehicles indicates incorrect gear ratio. Au7o has documented this code across 1 Cadillac model — most commonly on CT5. 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 Cadillac by Model
Cadillac CT5(1 issue)
- 10-Speed Transmission Damage Can Cause Wheel Lock-Up (Recall 25V148)2020-2021
Certain 2020-2021 Cadillac CT5 vehicles equipped with a 10-speed transmission can develop internal transmission damage that may cause the wheels to lock while driving.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Cadillac?▼
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 Cadillac specifically, this code is documented across 1 model.
What causes P0730 on Cadillac vehicles?▼
Common causes on Cadillac: 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 Cadillac?▼
Repair costs vary widely depending on the root cause and specific Cadillac model.
Which Cadillac models have P0730 documented?▼
Au7o has documented P0730 on 1 Cadillac model: CT5.