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P0500 P0xxx · 动力总成（P） 中严重度
Vehicle Speed Sensor Circuit Malfunction
No vehicle speed signal reaching the ECU or instrument cluster. Transmission shifting, speedometer and stability systems all depend on this input.
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
- Speedometer dead
- Harsh or wrong gear changes
- ABS/ESP warning lights
- Cruise control disabled
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed wheel speed or output shaft speed sensor
- 2 Open or shorted wiring
- 3 Damaged tone ring
- 4 Faulty instrument cluster (some vehicles)
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。
- ✓ Compare speed in the engine ECU, transmission ECU and ABS ECU — if ABS has it but the engine does not, the problem is the wiring or gateway.
- ✓ Read live wheel speeds on a scan tool while rolling slowly.
- ✓ Inspect tone rings for damage or heavy rust.
- ✓ Scope the sensor output at the connector.
维修方案
- Replace the speed sensor
- Repair the wiring
- Replace the damaged tone ring
P0500 —— 常见问题
Which sensor is it if there are four wheel sensors? +
Read all four live. One reading zero while the others track speed identifies it immediately.
Why did ABS and the gearbox both complain? +
They share the same wheel-speed data; a single sensor fault cascades across modules.