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Engine-Codes – Generic – C1091

C1091 Code - ABS Brake Lamp Control Circuit High

Quick Answer

The diagnostic trouble code C1091 indicates a problem with the ABS brake lamp control circuit being too high. Common causes include Faulty ABS brake lamp control module, Wiring or connector issues in the ABS brake lamp control circuit, Corrosion or damage to ABS sensor connectors. 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
C1091 indicates ABS Brake Lamp Control Circuit High.
Common causes
Common causes include Faulty ABS brake lamp control module, Wiring or connector issues in the ABS brake lamp control circuit, Corrosion or damage to ABS sensor connectors.
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 Aug 30, 2024
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Code C1091 Description

The diagnostic trouble code C1091 indicates a problem with the ABS brake lamp control circuit being too high. The ABS system is responsible for preventing the wheels from locking up during braking, improving control and safety. The ABS brake lamp control circuit is a crucial component that monitors the status of the ABS system and illuminates the ABS warning light on the dashboard if there is a fault detected.

OBDII Code C1091 - ABS Brake Lamp Control Circuit High
C1091 Code - ABS Brake Lamp Control Circuit High

Common Causes of C1091

  1. Faulty ABS brake lamp control module
  2. Wiring or connector issues in the ABS brake lamp control circuit
  3. Corrosion or damage to ABS sensor connectors
  4. Electrical short or open circuit in the ABS system
  5. Faulty ABS sensor

Symptoms of C1091

  1. ABS warning light illuminated on the dashboard
  2. Loss of ABS functionality
  3. Brakes locking up during sudden stops
  4. ABS pump running continuously
  5. Erratic brake behavior

How to Fix C1091

  1. Diagnose the issue using a diagnostic scanner to confirm the C1091 code and identify the specific component causing the problem.
  2. Inspect the wiring and connectors in the ABS brake lamp control circuit for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Check the ABS sensor connectors for any issues and replace if necessary.
  4. Test the ABS brake lamp control module for proper function and replace if it is faulty.
  5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix C1091

The typical repair costs for addressing the ABS brake lamp control circuit high code can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate.

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Code C1091 Information for Specific Makes

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 C1091 Code

1. What are the common symptoms of OBDII code C1091 ABS Brake Lamp Control Circuit High?

The common symptoms include the ABS warning light being illuminated on the dashboard, issues with the brake lights not functioning properly, and potential problems with the ABS system.

2. What are the possible causes of OBDII code C1091 ABS Brake Lamp Control Circuit High?

Possible causes include a faulty brake lamp switch, damaged wiring or connectors in the brake lamp circuit, a malfunctioning ABS control module, or a problem with the brake light bulbs.

3. How can I diagnose OBDII code C1091 ABS Brake Lamp Control Circuit High?

Diagnosis involves inspecting the brake light circuit for any visible damage, testing the brake lamp switch for proper functionality, and using a scan tool to check the ABS system for any stored fault codes.

4. Can I drive my vehicle with OBDII code C1091 ABS Brake Lamp Control Circuit High?

It is not recommended to drive your vehicle with this code present, as it indicates a potential issue with the ABS system and brake lights, which are crucial for safe driving.

5. How can I repair OBDII code C1091 ABS Brake Lamp Control Circuit High?

Repair methods may include replacing a faulty brake lamp switch, repairing damaged wiring or connectors, replacing defective brake light bulbs, or addressing any issues with the ABS control module.

6. Will resetting the OBDII code C1091 ABS Brake Lamp Control Circuit High make the issue go away?

Resetting the code may temporarily turn off the warning light, but it will not fix the underlying problem causing the code to trigger. It's important to diagnose and repair the issue to prevent further problems.

7. Are there any DIY repair tips for OBDII code C1091 ABS Brake Lamp Control Circuit High?

DIY repair tips may include checking and replacing brake light bulbs, inspecting and repairing damaged wiring, and testing the brake lamp switch with a multimeter to ensure proper function.

8. How much does it typically cost to repair OBDII code C1091 ABS Brake Lamp Control Circuit High?

The cost of repair can vary depending on the specific cause of the issue. Simple fixes like replacing brake light bulbs may be inexpensive, while more complex problems like a faulty ABS control module could be more costly.

9. Can OBDII code C1091 ABS Brake Lamp Control Circuit High affect the overall braking performance of my vehicle?

While this code specifically relates to the ABS brake lamp control circuit, unresolved issues with the ABS system can potentially impact overall braking performance and safety. It's important to address the problem promptly.

10. Is it necessary to visit a mechanic for OBDII code C1091 ABS Brake Lamp Control Circuit High, or can I fix it myself?

The complexity of the repair needed for this code may vary, so it's recommended to have a professional diagnose the issue to ensure proper repair. However, simple fixes like replacing brake light bulbs can often be done by DIY enthusiasts.

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