P0730: Incorrect Gear Ratio
Severity: high
What it means: The transmission's actual gear ratio doesn't match the commanded gear. In other words, it's slipping.
Safe to drive? Limited. Slipping can quickly damage the transmission and cause unexpected loss of drive.
Common symptoms
- Check-engine light
- Harsh, slipping or delayed shifts
- Possible limp mode (stuck in one gear)
Likely causes, ranked
- Low or degraded transmission fluidDIY
- Faulty shift solenoid or valve bodyShop
- Internal clutch wearShop
What it means: The transmission's actual gear ratio doesn't match the commanded gear. In other words, it's slipping.
Severity: High. Safe to drive? Limited. Slipping can quickly damage the transmission and cause unexpected loss of drive.
DIY or shop?
Check the fluid level and condition if your transmission allows it. Diagnosis is usually a shop job.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic. This code can involve stalling, engine damage or loss of power. If the check-engine light is flashing, or the car stalls or runs badly, stop driving and have it inspected.