P0730 Incorrect Gear Ratio
What does P0730 mean?
P0730 — Incorrect Gear Ratio. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects incorrect gear ratio. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0730
- Worn clutches or bands from slipping
- Low or burnt transmission fluid
- Stuck or faulty shift solenoid
- Failing torque converter
- Internal transmission damage
How to fix P0730
- Check transmission fluid level, color, and smell first
- Watch commanded vs actual gear and gear ratios on a scan tool
- Confirm the transmission slips or flares on a test drive
- Test solenoids and pressures with a scan tool
- Rebuild or replace the transmission if internal failure is confirmed