AutoCodes – Lincoln – B131B Lincoln

B131B Lincoln 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 Lincoln 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.

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Code Popularity 974

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

What does this mean?

What are the Possible Causes of the DTC B131B Lincoln?

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 Lincoln?

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 Lincoln 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.

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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 B131B Lincoln Code

1. What does the OBDII code B131B indicate on a Lincoln?

The code B131B indicates that there is an issue with the left front door ajar switch circuit, specifically that the circuit is open.

2. What are the common symptoms of the B131B code on a Lincoln?

Common symptoms include the door ajar warning light staying on, interior lights not turning off, or the alarm going off unexpectedly.

3. What could cause the B131B code to appear on a Lincoln?

Possible causes are a faulty left front door ajar switch, damaged wiring or connectors in the door ajar circuit, or a malfunctioning body control module.

4. How can I troubleshoot the B131B code in my Lincoln?

Begin by visually inspecting the wiring and connectors for damage or corrosion. Check the door ajar switchâ€™s operation and continuity using a multimeter. If these components are functional, further diagnostics on the body control module might be necessary.

5. Can I still drive my Lincoln if it shows the B131B code?

While it's usually safe to drive, the incorrect door ajar indication can be distracting or may cause battery drain if interior lights stay on. It's advisable to address the issue promptly.

6. What is the repair process for fixing a B131B code on a Lincoln?

Repair often involves either replacing the faulty door ajar switch or repairing any damaged wiring or connectors associated with the left front door ajar circuit.

7. How urgent is it to fix a B131B code on a Lincoln?

Itâ€™s moderately urgent to fix this issue to avoid potential safety concerns, such as the inability to secure the vehicle properly or battery drain from interior lights staying on.

8. Will ignoring a B131B code lead to further vehicle damage?

While it might not directly cause further damage to the vehicle, ignoring the issue can lead to security risks and increased wear on the battery and interior lighting system.

9. What tools are needed to diagnose the B131B code on a Lincoln?

A digital multimeter and a diagnostic scanner capable of interfacing with the vehicleâ€™s body control module are essential tools for diagnosing this issue.

10. After repairing a B131B code, will the warning light turn off automatically or is further action required?

In some cases, the warning light may turn off automatically once the issue is resolved. However, it might be necessary to clear the code with an OBDII scanner to reset the system completely.