OBD Guide
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B123A

Left Front Turn Indicator Circuit Short

B123A is an OBD-II diagnostic trouble code meaning: Left Front Turn Indicator Circuit Short. Common causes: wiring harness damage, turn signal lamp malfunction. Estimated repair cost: $22–89.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–89 (est.)

Symptoms

  • Left front turn signal does not work
  • The turn signals are flashing too quickly
  • Dashboard warning for turn signal failure

Causes

  • Wiring harness damage
  • Turn signal lamp malfunction
  • Short circuit in the circuit
  • Problems with the control unit

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the condition of the turn signal lamp
  3. Check the circuit for short circuit
  4. If necessary, replace faulty components
  5. Reset the error and check the system operation

Related codes

B123BB123CB123D

FAQ

What does the B123A code mean?

B123A is an OBD-II diagnostic trouble code that indicates: Left Front Turn Indicator Circuit Short

What causes a B123A error code?

The most common causes of B123A include: Wiring harness damage; Turn signal lamp malfunction; Short circuit in the circuit; Problems with the control unit.

How do I fix a B123A diagnostic trouble code?

To fix B123A: Check the integrity of the wiring harness. Check the condition of the turn signal lamp. Check the circuit for short circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B123A?

Do not drive — repair immediately

How much does it cost to fix B123A?

The estimated repair cost for B123A is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat