OBD Guide
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B2502

Left Lamp Low Beam Circuit Short to Battery

B2502 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 wiring harness. Estimated repair cost: $22–111.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Left low beam headlight does not work
  • Headlight fuse blown
  • Burning smell or overheating wiring
  • Flashing or uneven headlight operation

Causes

  • Damage to wire insulation
  • Short circuit in wiring harness
  • Faulty relay or fuse
  • Corrosion of headlight contacts
  • Incorrect connection after lamp replacement

How to Fix

  1. Check the headlight circuit fuse and relay
  2. Inspect the wiring harness for damage
  3. Check the headlight contacts and connectors
  4. Replace faulty components (wires, relays, lamp)
  5. Clean contacts from corrosion
  6. Reset the error with an OBD-II scanner

Related codes

B2501B2503B2504

FAQ

What does the B2502 code mean?

B2502 is an OBD-II diagnostic trouble code that indicates: Left Lamp Low Beam Circuit Short to Battery

What causes a B2502 error code?

The most common causes of B2502 include: Damage to wire insulation; Short circuit in wiring harness; Faulty relay or fuse; Corrosion of headlight contacts.

How do I fix a B2502 diagnostic trouble code?

To fix B2502: Check the headlight circuit fuse and relay. Inspect the wiring harness for damage. Check the headlight contacts and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2502?

Limited driving only, diagnose soon

How much does it cost to fix B2502?

The estimated repair cost for B2502 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat