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2021 BMW I3
Range Extender•RWD•AUTOMATIC•hybrid
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Repairs0Labor318Torque3717Fluid6DTC2228Battery1Maintenance0Recalls0
CC-ID-9low severityBody

Trailer Fog Light Failure

on 2021 BMW i3 Range Extender · RWD

What this code means

A fault has been detected in the trailer rear fog light circuit. The trailer lighting control module raised this message when the fog light failed to operate.

Symptoms

  • Trailer fog light not working
  • Fog light warning on dashboard
  • Reduced visibility in fog

Common causes

  • Blown fog light bulb
  • Corroded trailer connector
  • Damaged wiring to trailer
  • Faulty trailer module

Diagnostic steps

  1. Check trailer fog light bulb
  2. Inspect trailer connector for corrosion
  3. Test wiring continuity to trailer
  4. Verify trailer module operation
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