P0730 Code: Incorrect Gear Ratio
🟠 Moderate severity · drivable
Drivable, but the transmission is slipping, which can cause serious damage if ignored. Get it checked promptly.
What P0730 means
The transmission computer has detected that the gear ratio doesn't match what it commanded — the transmission is slipping. P0730 is the general version; P0731–P0735 point to a specific gear.
Symptoms
- Check engine light is on
- Transmission slipping
- Harsh or delayed shifts
- Reduced acceleration
- Possible limp mode
Common causes
- most common: Low or dirty transmission fluid
- common: Internal transmission slippage (worn clutches or bands)
- common: Faulty shift solenoid or valve body
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check and change the transmission fluid and filter | Yes | $100–250 |
| Repair internal transmission slippage | Mechanic | $1500–4000 |
Frequently asked questions
Can I drive with a P0730 code?
Yes, but the transmission is slipping, which can cause serious damage. Get it checked promptly.
What is the most common cause of P0730?
Low or dirty transmission fluid, or internal transmission wear.
How much does it cost to fix a P0730?
A fluid change is $100–$250; an internal rebuild runs $1,500–$4,000.
Related codes
P0731
P0731 Code: Gear 1 Incorrect Ratio
P0732P0732 Code: Gear 2 Incorrect Ratio
P0700P0700 Code: Transmission Control System Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.