OBD Guide
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B1500

Lamp Turn Signal Left Circuit Open

B1500 is an OBD-II diagnostic trouble code meaning: Lamp Turn Signal Left Circuit Open. Common causes: burnt out turn signal lamp, broken wiring harness. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • Turn indicators flashing at an increased frequency
  • Left turn signal does not work
  • Dashboard warning

Causes

  • Burnt out turn signal lamp
  • Broken wiring harness
  • Oxidized contacts in the cartridge
  • Faulty turn signal relay
  • Body Module (BCM) Problems

How to Fix

  1. Check the condition of the left turn signal lamp
  2. Inspect the wiring harness for damage
  3. Clean the contacts in the lamp socket
  4. Check turn signal relay
  5. Scan the BCM for additional errors

Related codes

B1501B1502B1515

FAQ

What does the B1500 code mean?

B1500 is an OBD-II diagnostic trouble code that indicates: Lamp Turn Signal Left Circuit Open

What causes a B1500 error code?

The most common causes of B1500 include: Burnt out turn signal lamp; Broken wiring harness; Oxidized contacts in the cartridge; Faulty turn signal relay.

How do I fix a B1500 diagnostic trouble code?

To fix B1500: Check the condition of the left turn signal lamp. Inspect the wiring harness for damage. Clean the contacts in the lamp socket. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1500?

Do not drive — repair immediately

How much does it cost to fix B1500?

The estimated repair cost for B1500 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat