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P0730 P0xxx · 动力总成（P） 高严重度
Incorrect Gear Ratio
The ECU compares input and output shaft speeds and finds a ratio that does not match the commanded gear — the transmission is slipping.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Slipping between gears
- Flaring on shifts
- Limp mode
- Burnt-fluid smell
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Low or burnt automatic transmission fluid
- 2 Worn clutches or bands
- 3 Faulty solenoid or valve body
- 4 Failed speed sensor giving bad data
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Check fluid level and condition first — burnt smell and dark colour confirm internal wear.
- ✓ Compare input and output speed PIDs against the expected ratio per gear.
- ✓ Rule out a sensor fault before condemning the gearbox.
- ✓ Line-pressure test if the manufacturer provides a tap.
维修方案
- Fluid and filter service for early slipping
- Solenoid or valve body repair
- Transmission overhaul if clutches are worn
P0730 —— 常见问题
Is a fluid change enough? +
Only if caught very early. Once the fluid smells burnt the clutches are already damaged.
Can a sensor cause this code? +
Yes — bad speed data produces a false ratio. Always verify with live data before a rebuild.