OBD Guide
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B258A

Low Beam Control Circuit

B258A is an OBD-II diagnostic trouble code meaning: Low Beam Control Circuit. Common causes: blown low beam circuit fuse, faulty headlight control relay. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–167 (est.)

Symptoms

  • Low beam headlights do not work
  • Flashing or uneven headlights
  • Dashboard warning for lighting fault

Causes

  • Blown low beam circuit fuse
  • Faulty headlight control relay
  • Open or shorted wiring harness
  • Poor contact in headlight connectors
  • Body Control Module (BCM) malfunction
  • Circuit Grounding Problems

How to Fix

  1. Check low beam circuit fuses
  2. Check headlight control relay
  3. Inspect the wiring harness for damage
  4. Check headlight connectors
  5. Test control circuit voltage
  6. Replace the BCM if necessary

Related codes

B258BB2585B2580

FAQ

What does the B258A code mean?

B258A is an OBD-II diagnostic trouble code that indicates: Low Beam Control Circuit

What causes a B258A error code?

The most common causes of B258A include: Blown low beam circuit fuse; Faulty headlight control relay; Open or shorted wiring harness; Poor contact in headlight connectors.

How do I fix a B258A diagnostic trouble code?

To fix B258A: Check low beam circuit fuses. Check headlight control relay. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B258A?

Do not drive — repair immediately

How much does it cost to fix B258A?

The estimated repair cost for B258A is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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