AutoCodes – Mercury – C111B Mercury

C111B Mercury Code - Left Stop Lamp Circuit

Quick Answer

The Body Control Module (BCM) monitors the Left Stop Lamp. Common causes include Faulty Left Stop Lamp, Left Stop Lamp harness is open or shorted, Left Stop Lamp circuit poor electrical connection. 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: C111B Mercury indicates Left Stop Lamp Circuit.
Common causes: Common causes include Faulty Left Stop Lamp, Left Stop Lamp harness is open or shorted, Left Stop Lamp circuit poor electrical connection.
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.

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Code Popularity 963

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 23, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C111B Mercury Description

The Body Control Module (BCM) monitors the Left Stop Lamp. The BCM sets the OBDII code when the Left Stop Lamp is not to factory specifications.

OBDII Code C111B Mercury - Left Stop Lamp Circuit - AutoCodes.com — C111B Mercury Code - Left Stop Lamp Circuit

What does this mean?

What are the Possible Causes of the DTC C111B Mercury?

Faulty Left Stop Lamp
Left Stop Lamp harness is open or shorted
Left Stop Lamp circuit poor electrical connection
Faulty Stop Lamp Switch
Faulty Body Control Module (BCM)

How to Fix the DTC C111B 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 does this mean?

Code Tech Notes

C111B:11 Left Stop Lamp: Circuit Short to Ground
C111B:15 Left Stop Lamp: Circuit Short to Battery or Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C111B 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 C111B Mercury code?

Need more information on how to fix the C111B Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 C111B Mercury Code

1. What are common symptoms of OBDII code C111B Mercury for the Left Stop Lamp Circuit?

- Common symptoms include the left stop lamp not illuminating when braking, dashboard warning lights related to brake lights, or a message indicating a brake light malfunction.

2. What are possible causes of OBDII code C111B Mercury for the Left Stop Lamp Circuit?

- Possible causes may include a faulty left stop lamp bulb, a damaged wiring harness, a defective brake light switch, or a problem with the vehicle's body control module.

3. How can I diagnose the issue with OBDII code C111B Mercury for the Left Stop Lamp Circuit?

- You can start by visually inspecting the left stop lamp bulb and its connection. Check the wiring for any visible damage or corrosion. Use a multimeter to test the continuity of the circuit and the brake light switch functionality.

4. Can I still drive my vehicle with OBDII code C111B Mercury active?

- It is not recommended to drive with a malfunctioning brake light, as it can pose a safety hazard to yourself and other drivers on the road. It is advisable to address the issue as soon as possible.

5. How do I repair OBDII code C111B Mercury for the Left Stop Lamp Circuit?

- Depending on the cause, you may need to replace the left stop lamp bulb, repair or replace damaged wiring, adjust or replace the brake light switch, or reprogram the body control module if necessary.

6. Are there any DIY tips for fixing OBDII code C111B Mercury for the Left Stop Lamp Circuit?

- DIY tips include checking and replacing the left stop lamp bulb, inspecting and repairing wiring connections, and adjusting the brake light switch if needed. However, if you are unsure, it is best to seek professional assistance.

7. Can a loose connection cause OBDII code C111B Mercury for the Left Stop Lamp Circuit?

- Yes, a loose or poor connection in the left stop lamp circuit can trigger this OBDII code. Ensure all connections are secure and free of corrosion to prevent this issue.

8. Will resetting the OBDII code C111B Mercury resolve the problem temporarily?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the code. It is essential to diagnose and address the root cause to prevent the problem from recurring.

9. Is OBDII code C111B Mercury specific to certain Mercury models?

- OBDII code C111B for the Left Stop Lamp Circuit can be specific to various Mercury models, so it is essential to consult your vehicle's specific service manual or a professional for accurate information.

10. How can I prevent OBDII code C111B Mercury for the Left Stop Lamp Circuit from happening again?

- Regularly inspect and maintain your vehicle's brake lights, wiring, and connections. Promptly address any issues related to the left stop lamp circuit to prevent the recurrence of this OBDII code.