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Engine-Codes – Generic – B1566

B1566 Code - Door Ajar Circuit Short To Ground

Quick Answer

The B1566 diagnostic trouble code (DTC) indicates that there is a short to ground in the door ajar circuit of the vehicle. Common causes include Wiring harness damage or wear, Faulty door ajar switch, Corrosion in the connectors. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1566 indicates Door Ajar Circuit Short To Ground.
Common causes
Common causes include Wiring harness damage or wear, Faulty door ajar switch, Corrosion in the connectors.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code B1566 Description

The B1566 diagnostic trouble code (DTC) indicates that there is a short to ground in the door ajar circuit of the vehicle. This means that the circuit responsible for detecting whether a door is open or closed is experiencing a direct connection to the vehicle's ground, causing a malfunction in the system. This issue can lead to inaccurate door ajar warnings on the dashboard, interior lights staying on when doors are closed, and potentially affecting the vehicle's security system.

OBDII Code B1566 - Door Ajar Circuit Short To Ground
B1566 Code - Door Ajar Circuit Short To Ground

Common Causes of B1566

  1. Wiring harness damage or wear
  2. Faulty door ajar switch
  3. Corrosion in the connectors
  4. Short to ground due to water intrusion
  5. BCM malfunction

Symptoms of B1566

  1. Inaccurate door ajar warnings on the dashboard
  2. Interior lights staying on when doors are closed
  3. Issues with the vehicle's security system
  4. Power door locks malfunctioning
  5. Battery drain due to lights staying on

How to Fix B1566

  1. Start by inspecting the wiring harness for any visible damage or wear. Repair or replace any damaged wires.
  2. Check the door ajar switches for proper operation and replace any faulty switches.
  3. Clean and inspect the connectors for corrosion. Address any corrosion issues.
  4. Look for signs of water intrusion in the door jamb area and seal any entry points to prevent future issues.
  5. If all components check out, the issue may lie with the BCM. Consult with a professional technician for further diagnosis and potential replacement of the BCM.

Cost to Fix B1566

The typical repair costs for addressing a door ajar circuit short to ground issue can range from $100 to $300, depending on the specific cause of the problem and the labor rates at the auto repair shop. Additional costs may apply if components like the door ajar switch or BCM need replacement. As always, it's recommended to obtain a detailed quote from a reputable auto repair shop to get an accurate estimate based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1566 Code

1. What does the OBDII code B1566 mean?

B1566 indicates a "Door Ajar Circuit Short To Ground," meaning there is an electrical issue causing the door ajar sensor to malfunction.

2. What are the symptoms of code B1566?

Common symptoms include the door ajar warning staying on, interior lights staying illuminated, or a chime sounding continuously while driving.

3. What causes the B1566 code to appear?

This code is typically caused by a short to ground in the door ajar circuit, damaged wiring, a faulty door ajar switch, or corrosion in the electrical connections.

4. Can a B1566 code drain my battery?

Yes, if the interior lights stay on due to this code, it can lead to battery drain over time.

5. How can I diagnose the B1566 code?

Start by inspecting the door ajar switch, wiring, and connectors for damage, corrosion, or loose connections. Use a multimeter to test the circuit for continuity and shorts.

6. Can I drive with the B1566 code active?

While you can drive with this code, it may cause distractions from warning chimes or lights, and unresolved issues could lead to further electrical problems.

7. How is the B1566 code repaired?

Repairs may involve fixing or replacing damaged wiring, cleaning corroded connections, or replacing a faulty door ajar switch.

8. Does the B1566 code only affect one door?

Not necessarily. The code may be specific to one door’s circuit, but it’s important to check all door ajar sensors and wiring to ensure proper function.

9. How much does it cost to fix the B1566 code?

Repair costs vary depending on the issue but typically range from $50 to $200 for labor and parts, such as a new door ajar switch.

10. Will clearing the B1566 code fix the issue?

No, clearing the code will not fix the underlying problem. The fault must be diagnosed and repaired to prevent the code from returning.

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