P0730 on Mazda
Incorrect Gear Ratio
P0730 on Mazda vehicles indicates incorrect gear ratio. Au7o has documented this code across 3 Mazda models — most commonly on CX-60, CX-90, Mazda3. 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 Mazda range from $800 to $2,000, 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 Mazda by Model
Mazda CX-60(1 issue)
- PHEV 8-Speed Transmission Surging, Jerking, and Gear Confusion2022-2024
The Mazda CX-60 PHEV's 8-speed automatic transmission exhibits harsh jerking, surging, and gear hunting behavior, particularly during low-speed driving, hill climbing, and transitions between electric and combustion power. The transmission appears confused during the handoff between the electric motor and the 2.5L inline-four engine, causing lurching when the driver eases off the throttle uphill. Mazda issued recall AR058A addressing PCM, BECM, TCM, and DASH-ESU software updates to improve powertrain coordination.
Mazda CX-90(1 issue)
- 8-Speed Automatic Transmission Jerkiness2024-2025
The new Aisin-sourced 8-speed automatic transmission in the CX-90 exhibits jerky low-speed shifts, particularly the 1-2 and 2-3 upshifts. The transmission hesitates during parking lot maneuvers and light throttle driving. This is Mazda's first use of this 8-speed longitudinal gearbox, and early calibration has been rough. Multiple TSBs and software updates have been released.
Mazda Mazda3(1 issue)
- Clutch Judder on SkyActiv Manual Transmission2014-2025
SkyActiv-equipped Mazda3 models with manual transmission suffer from clutch judder during engagement, particularly from a stop or slow roll. The dual-mass flywheel and clutch disc material contribute to vibration felt through the pedal and drivetrain. Mazda released TSB 05-004/17 addressing clutch disc and pressure plate replacement.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Mazda?▼
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 Mazda specifically, this code is documented across 3 models.
What causes P0730 on Mazda vehicles?▼
Common causes on Mazda: 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 Mazda?▼
Repair costs on Mazda range from $800 to $2,000, depending on the specific model and root cause.
Which Mazda models have P0730 documented?▼
Au7o has documented P0730 on 3 Mazda models: CX-60, CX-90, Mazda3.