OBD Guide
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B2664

Headlamp Relay Output Open Circuit or Short to Battery

B2664 is an OBD-II diagnostic trouble code meaning: Headlamp Relay Output Open Circuit or Short to Battery. Common causes: broken wire in the relay control circuit, short circuit to battery positive. Estimated repair cost: $11–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Headlights don't work
  • Headlights turn on/off randomly
  • Malfunction indicator light on dashboard

Causes

  • Broken wire in the relay control circuit
  • Short circuit to battery positive
  • Faulty headlight relay
  • Wiring harness damage
  • Problems with the lighting control unit

How to Fix

  1. Check the serviceability of the headlight relay (replace if necessary)
  2. Test the relay control circuit for breaks.
  3. Check for short circuit to positive
  4. Inspect the wiring harness for damage
  5. If necessary, replace damaged wires
  6. Check the operation of the lighting control unit

Related codes

B2665B2666B2667

FAQ

What does the B2664 code mean?

B2664 is an OBD-II diagnostic trouble code that indicates: Headlamp Relay Output Open Circuit or Short to Battery

What causes a B2664 error code?

The most common causes of B2664 include: Broken wire in the relay control circuit; Short circuit to battery positive; Faulty headlight relay; Wiring harness damage.

How do I fix a B2664 diagnostic trouble code?

To fix B2664: Check the serviceability of the headlight relay (replace if necessary). Test the relay control circuit for breaks.. Check for short circuit to positive. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2664?

Limited driving only, diagnose soon

How much does it cost to fix B2664?

The estimated repair cost for B2664 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat