OBD Guide
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B2506

Left Lamp Low Beam Circuit Short to Battery

B2506 is an OBD-II diagnostic trouble code meaning: Left Lamp Low Beam Circuit Short to Battery. Common causes: damage to wire insulation, short circuit in the headlight unit. Estimated repair cost: $22–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–167 (est.)

Symptoms

  • The low beam of the left headlight does not work
  • Lighting headlight fault indicator
  • Automatic low beam switch-off
  • Light circuit fuse blown

Causes

  • Damage to wire insulation
  • Short circuit in the headlight unit
  • Faulty lighting relay
  • Oxidation of headlight connector contacts
  • BCM controller failure
  • Mechanical damage to the wiring harness

How to Fix

  1. Check low beam fuse
  2. Visually inspect the wiring harness at the left headlight
  3. Test the circuit for short circuit with a multimeter
  4. Check lamp resistance
  5. Diagnose connectors and relays
  6. Replace headlight assembly or BCM if necessary

Related codes

B2505B2507B2512

FAQ

What does the B2506 code mean?

B2506 is an OBD-II diagnostic trouble code that indicates: Left Lamp Low Beam Circuit Short to Battery

What causes a B2506 error code?

The most common causes of B2506 include: Damage to wire insulation; Short circuit in the headlight unit; Faulty lighting relay; Oxidation of headlight connector contacts.

How do I fix a B2506 diagnostic trouble code?

To fix B2506: Check low beam fuse. Visually inspect the wiring harness at the left headlight. Test the circuit for short circuit with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2506?

Limited driving only, diagnose soon

How much does it cost to fix B2506?

The estimated repair cost for B2506 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat