AutoCodes – Generic – B109B

B109B 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 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 5,593

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

What does this mean?

What are the Possible Causes of the DTC B109B?

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?

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 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 B109B code?

Need more information on how to fix the B109B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B109B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B109B Chrysler — Panel Model Door 2 Control Circuit/Performance
B109B Dodge — Panel Model Door 2 Control Circuit/Performance
B109B Ford — License Plate Light
B109B Jeep — Panel Model Door 2 Control Circuit/Performance
B109B Lincoln — License Plate Light
B109B Mercury — License Plate Light
B109B RAM — Panel Model Door 2 Control Circuit/Performance

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 Code

What does the OBDII code B109B indicate?

The OBDII code B109B indicates a malfunction related to the license plate light circuit, often signaling that the license plate light is either not functioning or has an electrical issue.

What are common symptoms of the B109B code?

Common symptoms include a warning light on the dashboard, a non-functioning license plate light, and potentially other related electrical issues in the vehicle's lighting system.

What could cause the B109B code to trigger?

Causes may include a burnt-out license plate bulb, a faulty wiring connection, a defective license plate light socket, or a problem with the vehicle's body control module.

How can I diagnose the B109B code?

To diagnose the B109B code, visually inspect the license plate light bulb and socket, check for any damaged wiring, use a multimeter to test for voltage, and scan the vehicle's system for additional codes.

What should I do if I find a burnt-out license plate bulb?

If you find a burnt-out bulb, replace it with a new bulb that matches the specifications for your vehicle's license plate light.

Can I drive my vehicle with the B109B code?

While it's possible to drive your vehicle with the B109B code, it's advisable to address the issue promptly, as it may lead to further electrical problems and could result in a failed inspection.

Is there a way to reset the B109B code after repairs?

Yes, after completing the necessary repairs, you can reset the B109B code using an OBDII scanner or by disconnecting the vehicle's battery for a short period.

Are there any specific tools needed to fix the B109B code?

Tools you may need include a multimeter for testing electrical connections, a basic toolset for bulb replacements, and an OBDII scanner for reading and clearing codes.

What if the license plate light works but the B109B code persists?

If the light works but the code persists, there may be an intermittent electrical issue or a problem within the body control module that needs further investigation.