AutoCodes – Mercury – B109B Mercury

B109B Mercury Code - License Plate Light

Quick Answer

The Body Control Module (BCM) monitors the License Plate Light. Common causes include Faulty License Plate Light, License Plate Light harness is open or shorted, License Plate Light 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: B109B Mercury indicates License Plate Light.
Common causes: Common causes include Faulty License Plate Light, License Plate Light harness is open or shorted, License Plate Light 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 862

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Basic DIY (1 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B109B Mercury Description

The Body Control Module (BCM) monitors the License Plate Light. The BCM sets the OBDII code when the License Plate Light is not to factory specifications.

OBDII Code B109B Mercury - License Plate Light - AutoCodes.com — B109B Mercury Code - License Plate Light

What does this mean?

What are the Possible Causes of the DTC B109B Mercury?

Faulty License Plate Light
License Plate Light harness is open or shorted
License Plate Light circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B109B 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 B109B 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.

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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 B109B Mercury Code

1. What does the OBDII code B109B Mercury License Plate Light mean?

The code B109B indicates a problem with the license plate light circuit in a Mercury vehicle.

2. What are the common symptoms of OBDII code B109B Mercury License Plate Light?

Common symptoms include a warning light on the dashboard, a faulty license plate light, or issues with the license plate light turning on or off intermittently.

3. What are the possible causes of OBDII code B109B Mercury License Plate Light?

Possible causes include a burnt-out license plate light bulb, a damaged wiring harness, a faulty license plate light socket, or a malfunctioning control module.

4. How can I diagnose the issue related to OBDII code B109B Mercury License Plate Light?

You can start by visually inspecting the license plate light bulb, checking the wiring for any visible damage, and using a multimeter to test the voltage at the light socket.

5. How can I repair the problem associated with OBDII code B109B Mercury License Plate Light?

Repair options may include replacing the license plate light bulb, repairing or replacing damaged wiring, fixing a faulty socket, or reprogramming the control module if needed.

6. Can I continue driving with the OBDII code B109B Mercury License Plate Light illuminated?

It is generally safe to continue driving, but it's important to address the issue promptly to ensure compliance with local regulations and to maintain proper visibility on the road.

7. How much does it typically cost to repair OBDII code B109B Mercury License Plate Light?

The cost of repairs can vary depending on the exact cause of the issue, but it may range from a simple bulb replacement costing a few dollars to more extensive repairs involving wiring or control module replacement.

8. Will resetting the OBDII system clear the B109B Mercury License Plate Light code?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after some driving cycles.

9. Can a DIY enthusiast fix the OBDII code B109B Mercury License Plate Light issue?

Yes, some repairs related to this code, such as replacing a light bulb or repairing wiring, can be done by DIY enthusiasts with basic automotive knowledge and tools.

10. How long does it take to repair OBDII code B109B Mercury License Plate Light?

The repair time can vary depending on the exact cause of the issue and the expertise of the person performing the repairs, but it may take anywhere from a few minutes for a simple bulb replacement to a couple of hours for more complex repairs.