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C0280 C0xxx · 底盘（C） 高严重度
Brake Pedal Position / Travel Sensor Fault
The ECU cannot trust the brake pedal input, which affects brake light operation, regenerative blending on hybrids and EVs, and stability logic.
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
- Brake lights not working or always on
- Regenerative braking inconsistent
- Cannot shift out of park on some vehicles
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed pedal position sensor
- 2 Misadjusted switch
- 3 Wiring fault
- 4 Software calibration lost
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。
- ✓ Watch brake switch state in live data while pressing the pedal — check both stages if fitted.
- ✓ Confirm the brake lights actually operate.
- ✓ Adjust or replace the switch, then recalibrate if required.
- ✓ On hybrids/EVs, verify regen blending returns after the repair.
维修方案
- Replace or adjust the brake pedal switch
- Repair the wiring
- Recalibrate the pedal sensor
C0280 —— 常见问题
Can it stop me selecting gear? +
Yes — most automatic vehicles require a valid brake signal before releasing the shift interlock.
Why does regen feel wrong? +
The ECU blends friction and regenerative braking from pedal position; a bad signal breaks the blend.