OBD Guide
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B1809

Lamp Tail Output Circuit Short To Ground

B1809 is an OBD-II diagnostic trouble code meaning: Lamp Tail Output Circuit Short To Ground. Common causes: wiring harness damage, short circuit in lights. Estimated repair cost: $22–111.

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

Symptoms

  • Tail lights don't work
  • Fuses blow
  • Flashing or dim lights

Causes

  • Wiring harness damage
  • Short circuit in lights
  • Relay fault
  • Problems with the control unit

How to Fix

  1. Check fuses and replace if necessary
  2. Inspect the wiring harness for damage
  3. Check tail lights for short circuit
  4. Check relay and control unit

Related codes

B1808B1810

FAQ

What does the B1809 code mean?

B1809 is an OBD-II diagnostic trouble code that indicates: Lamp Tail Output Circuit Short To Ground

What causes a B1809 error code?

The most common causes of B1809 include: Wiring harness damage; Short circuit in lights; Relay fault; Problems with the control unit.

How do I fix a B1809 diagnostic trouble code?

To fix B1809: Check fuses and replace if necessary. Inspect the wiring harness for damage. Check tail lights for short circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1809?

Limited driving only, diagnose soon

How much does it cost to fix B1809?

The estimated repair cost for B1809 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat