OBD Guide
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B17D4

Headlamp Status Output Circuit Low

B17D4 is an OBD-II diagnostic trouble code meaning: Headlamp Status Output Circuit Low. Common causes: open or short circuit in wiring harness, faulty headlight control module. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Headlights don't work
  • Flashing headlights
  • Dashboard warning

Causes

  • Open or short circuit in wiring harness
  • Faulty headlight control module
  • Poor contact in connectors
  • Blown fuse
  • Faulty relay

How to Fix

  1. Check fuses and relays
  2. Inspect the wiring harness for damage
  3. Check contacts in connectors
  4. Test the headlight control module
  5. Replace faulty components

Related codes

B17D3B17D5

FAQ

What does the B17D4 code mean?

B17D4 is an OBD-II diagnostic trouble code that indicates: Headlamp Status Output Circuit Low

What causes a B17D4 error code?

The most common causes of B17D4 include: Open or short circuit in wiring harness; Faulty headlight control module; Poor contact in connectors; Blown fuse.

How do I fix a B17D4 diagnostic trouble code?

To fix B17D4: Check fuses and relays. Inspect the wiring harness for damage. Check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B17D4?

Limited driving only, diagnose soon

How much does it cost to fix B17D4?

The estimated repair cost for B17D4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat