P0730
Incorrect Gear Ratio
What it means
P0730 means Incorrect Gear Ratio.
Check these first
- Worn clutches or bands from slipping
- Low or burnt transmission fluid
- Stuck or faulty shift solenoid
- Failing torque converter
- Internal transmission damage
What to do next
- 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
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.