P0730 on Audi
Incorrect Gear Ratio
P0730 on Audi vehicles indicates incorrect gear ratio. Au7o has documented this code across 3 Audi models — most commonly on 100, A4 Avant, TT. 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 Audi range from $300 to $6,000, 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 Audi by Model
Audi 100(1 issue)
- Automatic Transmission Harsh Shifting1990-1994
The Audi 100/200 automatic transmission develops harsh shifting patterns and delayed engagement. The multi-plate clutches and valve body solenoids wear, particularly in higher-mileage examples.
Audi A4 Avant(1 issue)
- Multitronic CVT Transmission Failure2002-2008
The Multitronic CVT used in front-wheel drive A4 Avants is prone to premature failure of the chain, pulleys, and control unit. This transmission has a poor reliability record and is expensive to repair.
Audi TT(1 issue)
- S-Tronic DSG Transmission Issues (Mk2)2008-2015
Early Mk2 TT models (2008-2009) with the 6-speed or 7-speed S-Tronic dual-clutch transmission (DSG) experience frequent mechatronic unit and clutch pack failures. Symptoms include rough or delayed shifting at low speeds, hesitation when accelerating, jerking when engaging gears, and complete transmission failure requiring tow. The mechatronic unit (valve body) suffers from software glitches and internal failures. Audi marketed DSG as "sealed for life," but fluid and filter changes every 40,000 miles dramatically reduce failure rates. Reports of DSG failures tapered off after 2009 model year with updated parts. Repair costs for mechatronic replacement are $2,000-$4,000. TTForum.co.uk reports many 2008-2009 owners experiencing this issue.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Audi?▼
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 Audi specifically, this code is documented across 3 models.
What causes P0730 on Audi vehicles?▼
Common causes on Audi: 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 Audi?▼
Repair costs on Audi range from $300 to $6,000, depending on the specific model and root cause.
Which Audi models have P0730 documented?▼
Au7o has documented P0730 on 3 Audi models: 100, A4 Avant, TT.