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P0335 P0xxx · 动力总成（P） 高严重度
Crankshaft Position Sensor A Circuit Malfunction
No usable crank signal. Without it the ECU cannot time injection or ignition, so the engine will usually crank without starting.
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
- Cranks but will not start
- Stalling while driving
- Tachometer dead while cranking
- No spark or injector pulse
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed crankshaft position sensor
- 2 Damaged or heat-brittle wiring
- 3 Metal debris or a cracked reluctor wheel
- 4 Corroded connector
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 engine RPM in live data while cranking — no RPM reading confirms the signal is missing.
- ✓ Check the sensor connector and wiring for heat damage near the exhaust.
- ✓ Measure sensor resistance and AC voltage output while cranking.
- ✓ Scope the waveform — a clean square or sine with no dropouts is required.
维修方案
- Replace the crankshaft position sensor
- Repair the wiring
- Replace a damaged reluctor
P0335 —— 常见问题
Can it be intermittent? +
Yes — heat-soak failures are classic: the car stalls when hot and restarts after cooling.
Why does the tachometer matter? +
If the tacho does not move while cranking, the ECU is not seeing engine speed — a fast way to confirm the fault.