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P0351 P0xxx · 动力总成（P） 高严重度
Ignition Coil A Primary / Secondary Circuit Malfunction
The ECU monitors the coil primary circuit for cylinder 1 and sees a fault — open, short, or a coil that does not draw the expected current.
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
- Hard misfire on cylinder 1
- Rough running
- Flashing MIL
- Possible no-start on single-coil engines
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed ignition coil
- 2 Open or shorted wiring to the coil
- 3 Corroded connector
- 4 Failed ECU ignition driver
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。
- ✓ Swap the coil with another cylinder — if the code follows, replace the coil.
- ✓ Check for battery voltage at the coil connector and a switched earth from the ECU.
- ✓ Scope the primary waveform to check dwell and switching.
- ✓ Inspect the connector for corrosion and pushed-out pins.
维修方案
- Replace the ignition coil
- Repair the wiring or connector
- ECU repair if the driver stage has failed
P0351 —— 常见问题
Is coil or plug more likely? +
Coils fail more often than plugs on modern engines, but plugs are cheaper — inspect both before ordering.
Do I need to replace all of them? +
If one has failed from age, the rest are close behind. Replacing the set avoids repeat labour.