Powertrain
generic / SAE
P0730
Incorrect Gear Ratio
The ratio between input and output speed does not match any expected gear. Indicates slippage, valve body fault or sensor inaccuracy without identifying a specific gear.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 30
Possible causes
- Internal slippage high
- Valve body fault medium
- Speed sensor reading inaccurate low
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–4000 €
- Estimated time: 2–12 h
- Component: automatic transmission
- Component: valve body
- Component: speed sensor
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012