OBD Guide

B3948

Left Front Turn Signal Circuit

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Left front turn signal does not work
  • Turn signals flash faster than usual
  • Error message on the dashboard

Causes

  • Burnt out turn signal lamp
  • Broken or damaged wires
  • Poor contact in connectors
  • Turn signal relay malfunction
  • Wiring harness problem

How to Fix

  1. Check the condition of the left front turn signal lamp
  2. Inspect wires and connectors for damage
  3. Check turn signal relay
  4. Test the wiring harness for continuity
  5. Replace faulty components

Related codes

Error B3948 by Vehicle Brand