AutoCodes – Mercury – B131B Mercury

B131B Mercury Code - Left Front Door Ajar Switch Circuit Open

Quick Answer

The Body Control Module (BCM) monitors the Left Front Door Ajar Switch. Common causes include Faulty Left Front Door Ajar Switch, Left Front Door Ajar Switch harness is open or shorted, Left Front Door Ajar Switch circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B131B Mercury indicates Left Front Door Ajar Switch Circuit Open.
Common causes: Common causes include Faulty Left Front Door Ajar Switch, Left Front Door Ajar Switch harness is open or shorted, Left Front Door Ajar Switch circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,115

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B131B Mercury Description

The Body Control Module (BCM) monitors the Left Front Door Ajar Switch. The BCM sets the OBDII code when the Left Front Door Ajar Switch is not to factory specifications.

OBDII Code B131B Mercury - Left Front Door Ajar Switch Circuit Open - AutoCodes.com — B131B Mercury Code - Left Front Door Ajar Switch Circuit Open

What does this mean?

What are the Possible Causes of the DTC B131B Mercury?

Faulty Left Front Door Ajar Switch
Left Front Door Ajar Switch harness is open or shorted
Left Front Door Ajar Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B131B Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B131B Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B131B Mercury code?

Need more information on how to fix the B131B Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B131B Mercury code diagnosed by a professional: Find a repair shop in your area

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 B131B Mercury Code

1. What are the common symptoms of OBDII code B131B Mercury (Left Front Door Ajar Switch Circuit Open)?

- Common symptoms include the interior lights staying on, the door ajar warning light being illuminated on the dashboard, and issues with power door locks.

2. What can cause the OBDII code B131B Mercury to trigger?

- The code may be triggered by a faulty left front door ajar switch, a damaged wiring harness, or a poor electrical connection.

3. How can I diagnose the cause of the Left Front Door Ajar Switch Circuit Open code?

- To diagnose the issue, you can visually inspect the wiring harness, test the left front door ajar switch for continuity, and use a scan tool to monitor the switch status.

4. What is the typical repair for OBDII code B131B Mercury?

- The typical repair involves replacing the left front door ajar switch if it is faulty, repairing any damaged wiring, and ensuring all electrical connections are secure.

5. Can I drive my vehicle with the Left Front Door Ajar Switch Circuit Open code?

- It is generally safe to drive the vehicle with this code, but you may experience issues with interior lights and door locks. It is recommended to get the issue fixed promptly.

6. How much does it cost to repair the Left Front Door Ajar Switch Circuit Open code?

- The cost of repair can vary depending on the extent of the issue and the labor rates of the repair shop. However, replacing the door ajar switch or repairing the wiring is typically affordable.

7. Can I reset the OBDII code B131B Mercury without fixing the underlying issue?

- Resetting the code without addressing the underlying problem will not fix the issue in the long term. It is recommended to diagnose and repair the cause of the code.

8. Are there any DIY tips for fixing the Left Front Door Ajar Switch Circuit Open code?

- DIY tips include checking the wiring harness for visible damage, testing the door switch with a multimeter, and ensuring all connections are clean and secure.

9. How long does it take to repair the Left Front Door Ajar Switch Circuit Open code?

- The repair time can vary depending on the accessibility of the door switch and the complexity of the wiring. In general, the repair can be completed in a few hours.

10. Will fixing the Left Front Door Ajar Switch Circuit Open code improve the overall performance of my vehicle?

- Fixing this code will primarily resolve issues related to interior lights and door locks. While it may not directly impact performance, it will improve the functionality and convenience of your vehicle.