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P0380 P0xxx · 动力总成（P） 中严重度
Glow Plug / Heater Circuit A Malfunction
A diesel cold-start aid circuit is open or drawing wrong current. Cold starts become hard and smoky, especially in winter.
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
- Hard cold starting
- White smoke on start-up
- Rough idle when cold
- Glow plug warning lamp on
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed glow plug
- 2 Blown glow plug fuse or failed relay
- 3 Open wiring in the harness
- 4 Faulty glow plug control module
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。
- ✓ Measure current draw of the glow plug circuit — compare total draw with specification.
- ✓ Test each plug's resistance individually; open or shorted plugs stand out.
- ✓ Check the relay/fuse and the control signal from the ECU.
- ✓ Inspect the busbar and wiring for corrosion.
维修方案
- Replace failed glow plugs (usually as a set)
- Replace the relay or fuse
- Repair the harness
P0380 —— 常见问题
Should I replace just the failed plug? +
Replace the set. Mixing old and new plugs gives uneven heating and the code often returns.
Why is it fine in summer? +
Compression heat alone is enough to start a warm engine; the glow system only matters when cold.