AutoCodes – Generic – C1091

C1091 Code - ABS Brake Lamp Control Circuit High

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the ABS Brake Lamp. Common causes include Faulty ABS Brake Lamp, ABS Brake Lamp harness is open or shorted, ABS Brake 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
C1091 indicates ABS Brake Lamp Control Circuit High.
Common causes
Common causes include Faulty ABS Brake Lamp, ABS Brake Lamp harness is open or shorted, ABS Brake 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 19,541
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Aug 10, 2020
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Code C1091 Description

The Anti-Lock Brake System (ABS) Module monitors the ABS Brake Lamp. The ABS Module sets the OBDII code when the ABS Brake Lamp is not to factory specifications.
OBDII Code C1091 - ABS Brake Lamp Control Circuit High - AutoCodes.com
C1091 Code - ABS Brake Lamp Control Circuit High

What are the Possible Causes of the DTC C1091?

  • Faulty ABS Brake Lamp
  • ABS Brake Lamp harness is open or shorted
  • ABS Brake Lamp circuit poor electrical connection

How to Fix the DTC C1091?

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 C1091 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 C1091 code?

Need more information on how to fix the C1091 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1091 code diagnosed by a professional: Find a repair shop in your area

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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