OBD Guide
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B1D02

Left High Beam Circuit Short

B1D02 is an OBD-II diagnostic trouble code meaning: Left High Beam Circuit Short. Common causes: wiring harness damage, oxidation of contacts. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–111 (est.)

Symptoms

  • Left high beam headlight does not work
  • Fuse blown
  • Flashing or unstable headlight operation
  • Burnt smell from wiring harness

Causes

  • Wiring harness damage
  • Oxidation of contacts
  • Headlamp relay malfunction
  • Problems with the control unit
  • Short circuit in headlight

How to Fix

  1. Check the headlight circuit fuse
  2. Inspect the wiring harness for damage
  3. Check contacts and connectors
  4. Test the relay and control unit
  5. Replace faulty components

Related codes

B1D01B1D03B1D04

FAQ

What does the B1D02 code mean?

B1D02 is an OBD-II diagnostic trouble code that indicates: Left High Beam Circuit Short

What causes a B1D02 error code?

The most common causes of B1D02 include: Wiring harness damage; Oxidation of contacts; Headlamp relay malfunction; Problems with the control unit.

How do I fix a B1D02 diagnostic trouble code?

To fix B1D02: Check the headlight circuit fuse. Inspect the wiring harness for damage. Check contacts and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1D02?

Do not drive — repair immediately

How much does it cost to fix B1D02?

The estimated repair cost for B1D02 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat