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Code
P15D1
BMW cooling

Electric water pump circuit malfunction

BMW electric water pump circuit fault (N20/N55).

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Most likely causes

  1. Failed electric water pump
  2. Wiring fault
  3. Low coolant

Symptoms you may notice

  • Overheating
  • Check engine light
  • Coolant warning

Checks to run

  1. Check coolant level
  2. Test pump power and wiring
  3. Check the pump

Tools you may need

Multimeter
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.
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