Skip to main content
本页暂无Chinese版本，以下为英文原文。 查看英文版 →
B1318 B0xxx · 车身（B） 中严重度

System Voltage Low (Body Module)

The body module has seen supply voltage below its operating threshold. Always find the cause — a weak battery sets this long before it fails to start.

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

  • Intermittent electrical faults
  • Central locking or windows slow
  • Warning lamps on start-up

常见原因

按可能性从高到低排列——从最上面开始查。

  1. 1 Weak or failing battery
  2. 2 Loose or corroded earth
  3. 3 High resistance in the main supply
  4. 4 Parasitic drain

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。

  1. ✓ Load-test the battery — do not trust an open-circuit voltage reading.
  2. ✓ Measure voltage drop across the main earth and supply while cranking.
  3. ✓ Check for a parasitic drain if the fault appears after parking.
  4. ✓ Inspect the earth points under the dash and in the engine bay.

维修方案

  • Replace the battery
  • Clean and torque the earth points
  • Find and remove the parasitic drain

B1318 —— 常见问题

The battery reads 12.4 V — is that fine? +

Only a load test tells you. A battery can read healthy at rest and collapse under starter load.

Will a new battery clear the code? +

It will stop the cause, but you still need to clear stored codes and re-check after a few cold starts.

买配件之前先确认诊断结论

把故障码、冻结帧数据和车型发给我们——工程师会告诉你先测哪一项。

获取免费报价 浏览产品