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Engine-Codes – Mercury – C111B Mercury

C111B Mercury Code - Left Stop Lamp Circuit

Quick Answer

The C111B diagnostic trouble code (DTC) for Mercury vehicles specifically refers to an issue with the left stop lamp circuit. Common causes include Blown fuse in the left stop lamp circuit, Faulty brake light bulb, Damaged wiring or connectors in the left stop lamp circuit. 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 Blown fuse in the left stop lamp circuit, Faulty brake light bulb, Damaged wiring or connectors in the left stop lamp circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code C111B Mercury Description

The C111B diagnostic trouble code (DTC) for Mercury vehicles specifically refers to an issue with the left stop lamp circuit. This code indicates that there is a malfunction or fault in the electrical system that controls the left stop lamp, also known as the brake light. The brake light is a crucial safety feature that alerts other drivers when you are slowing down or stopping, so it is essential to address this issue promptly.

OBDII Code C111B Mercury - Left Stop Lamp Circuit
C111B Mercury Code - Left Stop Lamp Circuit

Common Causes of C111B Mercury

  1. Blown fuse in the left stop lamp circuit
  2. Faulty brake light bulb
  3. Damaged wiring or connectors in the left stop lamp circuit
  4. Malfunctioning brake light switch
  5. Corrosion or poor connections in the electrical system

Symptoms of C111B Mercury

  1. Left brake light not illuminating when brakes are applied
  2. Dashboard warning light indicating a brake light malfunction
  3. Vehicle failing state inspection or emissions testing
  4. Other drivers signaling or honking due to lack of brake light visibility

How to Fix C111B Mercury

  1. Begin by visually inspecting the left stop lamp bulb and socket for any signs of damage or corrosion. Replace the bulb if necessary.
  2. Check the fuse for the left stop lamp circuit and replace if blown.
  3. Inspect the wiring harness and connectors for any damage or loose connections. Repair or replace as needed.
  4. Test the brake light switch to ensure it is functioning correctly. Replace if faulty.
  5. Clear the DTC with a diagnostic scan tool and test the left stop lamp to confirm that the issue has been resolved.

Cost to Fix C111B Mercury

The cost of repairing the left stop lamp circuit can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of parts for this repair could range from $20 to $50, including a new brake light bulb, fuse, or wiring components. Labor costs typically range from $80 to $150 per hour, and the total repair bill could be anywhere from $100 to $300 or more. It is advisable to contact local auto repair shops for accurate pricing based on your vehicle make and model.

What does this mean?

Tech Notes for C111B Mercury

C111B:11 Left Stop Lamp: Circuit Short to Ground

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

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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.

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