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Engine-Codes – Generic – C1065

C1065 Code - Brake Light Relay Circuit Failure

Quick Answer

The C1065 diagnostic trouble code indicates a Brake Light Relay Circuit Failure in the vehicle. Common causes include Faulty brake light relay, Damaged wiring in the brake light circuit, Corrosion or poor connection in the relay 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
C1065 indicates Brake Light Relay Circuit Failure.
Common causes
Common causes include Faulty brake light relay, Damaged wiring in the brake light circuit, Corrosion or poor connection in the relay 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 09, 2024
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Code C1065 Description

The C1065 diagnostic trouble code indicates a Brake Light Relay Circuit Failure in the vehicle. This means that there is an issue with the relay responsible for controlling the brake lights. The brake light relay is a crucial component in the vehicle's electrical system, as it is responsible for activating the brake lights when the brake pedal is pressed. When this relay fails, it can lead to the brake lights not functioning properly, which can be a safety hazard as it may prevent other drivers from knowing when the vehicle is slowing down or stopping.

OBDII Code C1065 - Brake Light Relay Circuit Failure
C1065 Code - Brake Light Relay Circuit Failure

Common Causes of C1065

  1. Faulty brake light relay.
  2. Damaged wiring in the brake light circuit.
  3. Corrosion or poor connection in the relay circuit.
  4. Electrical issues in the vehicle's overall electrical system.
  5. Impact or damage to the brake light components.

Symptoms of C1065

  1. Brake lights not illuminating when the brake pedal is pressed.
  2. Intermittent functioning of the brake lights.
  3. Dashboard warning lights indicating a brake light system issue.
  4. Flickering or dim brake lights.

How to Fix C1065

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to read the fault codes and pinpoint the faulty component.
  2. Inspect the brake light relay and wiring for any visible damage, corrosion, or loose connections. Replace or repair any damaged components as needed.
  3. Test the brake light relay circuit using a multimeter to ensure proper voltage and continuity. Repair any inconsistencies found during testing.
  4. Clear the fault codes from the vehicle's system using the diagnostic scanner and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, seek professional help from a certified mechanic or auto electrician to further diagnose and repair the Brake Light Relay Circuit Failure.

Cost to Fix C1065

The typical repair costs for addressing a Brake Light Relay Circuit Failure can range from $100 to $300, 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. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less for repairs.

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Code C1065 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 C1065 Code

1. What are the common symptoms of OBDII code C1065 (Brake Light Relay Circuit Failure)?

- Common symptoms include the brake lights not working properly, the brake lights staying on constantly, or the brake lights flickering.

2. What are the possible causes of OBDII code C1065 (Brake Light Relay Circuit Failure)?

- Possible causes include a faulty brake light switch, a malfunctioning brake light relay, damaged wiring or connectors in the brake light circuit, or a problem with the body control module.

3. How can I diagnose the cause of OBDII code C1065 (Brake Light Relay Circuit Failure)?

- To diagnose this issue, you can start by checking the brake light switch, inspecting the brake light relay, and testing the wiring and connectors in the brake light circuit using a multimeter.

4. Can OBDII code C1065 (Brake Light Relay Circuit Failure) cause any safety concerns?

- Yes, this code can pose safety concerns as it may lead to brake lights not functioning properly, which can reduce visibility for other drivers and increase the risk of accidents.

5. How can I repair OBDII code C1065 (Brake Light Relay Circuit Failure)?

- Depending on the cause, you may need to replace the brake light switch, repair or replace the brake light relay, fix any damaged wiring or connectors, or reprogram the body control module.

6. Is it safe to continue driving with OBDII code C1065 (Brake Light Relay Circuit Failure) present?

- It is not recommended to drive with this issue unresolved, as malfunctioning brake lights can compromise your safety on the road. It's best to address the problem promptly.

7. Can a DIY enthusiast fix OBDII code C1065 (Brake Light Relay Circuit Failure) at home?

- Depending on your skill level and access to tools, you may be able to diagnose and repair this issue at home. However, if you're unsure or uncomfortable, it's best to seek professional help.

8. Will resetting the OBDII system clear OBDII code C1065 (Brake Light Relay Circuit Failure)?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle.

9. How much does it typically cost to repair OBDII code C1065 (Brake Light Relay Circuit Failure) at a repair shop?

- The cost of repair can vary depending on the specific cause of the issue and the labor rates in your area. It's advisable to get a few quotes from different shops for comparison.

10. Are there any preventative measures to avoid OBDII code C1065 (Brake Light Relay Circuit Failure)?

- Regularly inspecting and maintaining the brake light system, including the switch, relay, and wiring, can help prevent issues that may trigger this OBDII code.

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