OBD Guide
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B1566

Door Ajar Circuit Short To Ground

B1566 is an OBD-II diagnostic trouble code meaning: Door Ajar Circuit Short To Ground. Common causes: wiring harness damage, short circuit in the door sensor. Estimated repair cost: $56–167.

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

Symptoms

  • False alarm
  • Central locking doesn't work
  • The door open indicator is on when the doors are closed
  • Interior lighting does not work

Causes

  • Wiring harness damage
  • Short circuit in the door sensor
  • Contact corrosion
  • Body Control Module (BCM) Malfunction

How to Fix

  1. Check wiring harness for damage
  2. Check the door sensor
  3. Clean contacts from corrosion
  4. Check BCM operation
  5. Replace faulty components

Related codes

B1565B1567B1568

FAQ

What does the B1566 code mean?

B1566 is an OBD-II diagnostic trouble code that indicates: Door Ajar Circuit Short To Ground

What causes a B1566 error code?

The most common causes of B1566 include: Wiring harness damage; Short circuit in the door sensor; Contact corrosion; Body Control Module (BCM) Malfunction.

How do I fix a B1566 diagnostic trouble code?

To fix B1566: Check wiring harness for damage. Check the door sensor. Clean contacts from corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1566?

Limited driving only, diagnose soon

How much does it cost to fix B1566?

The estimated repair cost for B1566 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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