OBD Guide
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B2504

Right Lamp Low Beam Circuit Short to Battery

B2504 is an OBD-II diagnostic trouble code meaning: Right Lamp Low Beam Circuit Short to Battery. Common causes: damage to wire insulation, short circuit inside the headlight. Estimated repair cost: $22–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–167 (est.)

Symptoms

  • The right low beam headlight does not work
  • Frequent lamp burnout
  • Fuse tripping
  • Smell of burning insulation

Causes

  • Damage to wire insulation
  • Short circuit inside the headlight
  • Contact corrosion
  • Relay fault
  • Mechanical damage to the wiring harness

How to Fix

  1. Check low beam fuse
  2. Visually inspect the wiring harness at the headlight and in the wheel arch
  3. Check the circuit resistance from the relay to the headlight
  4. Disconnect the headlight and check the contact resistance
  5. Clean or replace oxidized contacts
  6. Replace damaged wires or headlight if a short circuit is detected

Related codes

B2503B2505B2506

FAQ

What does the B2504 code mean?

B2504 is an OBD-II diagnostic trouble code that indicates: Right Lamp Low Beam Circuit Short to Battery

What causes a B2504 error code?

The most common causes of B2504 include: Damage to wire insulation; Short circuit inside the headlight; Contact corrosion; Relay fault.

How do I fix a B2504 diagnostic trouble code?

To fix B2504: Check low beam fuse. Visually inspect the wiring harness at the headlight and in the wheel arch. Check the circuit resistance from the relay to the headlight. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2504?

Do not drive — repair immediately

How much does it cost to fix B2504?

The estimated repair cost for B2504 is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat