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C1230 C0xxx · 底盘（C） 中严重度
Stability System Longitudinal Acceleration Sensor Fault
The longitudinal acceleration input used by stability and hill-hold functions is missing or implausible.
严重程度说明： 中——已影响行驶或排放，请本周内安排检修
你会注意到的故障现象
- ESP warning lamp
- Hill-start assist unavailable
- Possible false intervention
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed sensor inside the ESP unit or separate module
- 2 Lost calibration
- 3 CAN fault
- 4 Mounting disturbed
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。
- ✓ Read live longitudinal acceleration with the vehicle level and stationary.
- ✓ Check the sensor mounting orientation.
- ✓ Run the zero-point calibration.
- ✓ Look for CAN faults if the sensor is external.
维修方案
- Replace and calibrate the sensor
- Repair the wiring
- Re-mount and recalibrate
C1230 —— 常见问题
Why does hill-start assist stop working? +
It needs a trustworthy longitudinal acceleration value to judge the gradient.
Can a level sensor be off but look fine? +
Yes — a slightly tilted module reads a constant false acceleration. Calibration confirms it.