P0730 on Honda
Incorrect Gear Ratio
P0730 on Honda vehicles indicates incorrect gear ratio. Au7o has documented this code across 6 Honda models — most commonly on Accord, Fit, HR-V. 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 Honda range from $100 to $7,000, 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 Honda by Model
Honda Accord(2 issues)
- ZF 9-Speed Transmission Rough Shifting, Shudder, and Hesitation (2.0T)2018-2022
The 10th generation Accord 2.0T uses the ZF 9HP48 9-speed automatic transmission - the same unit that caused widespread complaints in the Honda Pilot (2016-2019) and Acura TLX/MDX. Software-controlled dog clutches are incompatible with Honda's original calibration, causing violent shuddering, harsh downshifts (especially 2nd-3rd gear), hesitation accelerating from stops, and torque converter shudder between 20-65 mph. Honda issued multiple TSBs. The 10th gen 1.5T uses a different transmission (CVT or 6-speed) and does NOT share this issue. 2.0T models are exclusively affected.
- CVT Start Clutch Juddering2013-2015
Early Honda Accord CVT transmissions suffer from widespread start clutch juddering caused by a manufacturing defect. The issue causes shaking or juddering during acceleration, especially from a stop. Honda acknowledged the problem and extended the warranty to 100,000 miles or 10 years for affected VINs.
Honda Fit(1 issue)
- CVT Transmission Problems (3rd Gen)2015-2020
New CVT in 3rd gen Fit (2015-2020) had significant issues, particularly 2015-2016. Hesitation, shuddering during acceleration, whining/howling noise from transmission. Honda addressed some issues with software updates. Transmission cooler addition ($80-150) reportedly prevents issues according to some owners. CRITICAL: Use ONLY Honda HF-F CVT fluid ($35-50/quart) - other fluids void warranty and cause damage. Change CVT fluid every 30,000 miles religiously.
Honda HR-V(1 issue)
- CVT Transmission Shuddering and Judder2016-2022
The 2016-2022 Honda HR-V CVT (Continuously Variable Transmission) experiences shuddering, judder, hesitation, and premature belt deterioration. Symptoms include vibrations during acceleration (especially 15-35 mph), delayed engagement, and strange whining/grinding noises. Honda extended the CVT warranty to 7 years/150,000 miles for 2016-2020 models due to premature belt wear. If caught early, CVT fluid replacement can help, but severe cases require complete CVT replacement ($3,000-5,000).
Honda Insight(1 issue)
- CVT Transmission Judder and Failure (Second Gen)2010-2014
The 2010-2014 Honda Insight (second generation) CVT transmission experiences judder, shuddering, knocking noise during acceleration, and complete failure. Early CVT steel belt failures were identified. When CVT fails, the green "D" indicator on dash blinks. The transmission shudders at low speeds (15-35 mph) and makes knocking noises when shifting or accelerating. Honda extended CVT warranty to 10yr/150k miles on some models. CVT replacement: $3,000-5,000.
Honda Odyssey(1 issue)
- Automatic Transmission Complete Failure (2nd Gen)1999-2004
Complete transmission failure due to faulty bearings and defective 3rd clutch components in 4-speed (1999-2001) and 5-speed (2002-2004) automatic transmissions. The 2002-2004 transmission can suddenly downshift from 5th to 2nd gear causing dangerous drivability issues. Honda recalled 1.1 million vehicles in 2004 and settled class-action lawsuit in 2006.
Honda Pilot(2 issues)
- ZF 9-Speed Transmission Rough Shifting and Hesitation2016-2019
The ZF 9HP transmission produces rough and delayed shifting, loud noises during shifting, sudden harsh accelerations/decelerations, jerking/hesitating at all speeds, and loss of power. Problems stem from improper software calibration and electrical connection defects. Honda issued multiple TSBs but many issues persist until 2019 models.
- Automatic Transmission 2nd-Gear Overheating and Torque Converter Failure2003-2004
Early first-generation Pilot models share a well-documented 5-speed automatic transmission weakness with other Honda/Acura trucks of the era. Honda issued a safety recall to install an oil jet intended to improve lubrication/cooling of second gear because inadequate lubrication could lead to gear overheating, discoloration, breakage, and eventual transmission failure or lockup. Owners commonly report slipping, harsh shifting, flashing D4, burnt fluid, and complete loss of drive, sometimes even after the recall if damage had already begun.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Honda?▼
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 Honda specifically, this code is documented across 6 models.
What causes P0730 on Honda vehicles?▼
Common causes on Honda: 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 Honda?▼
Repair costs on Honda range from $100 to $7,000, depending on the specific model and root cause.
Which Honda models have P0730 documented?▼
Au7o has documented P0730 on 6 Honda models: Accord, Fit, HR-V, Insight, Odyssey, Pilot.