AutoCodes – Honda – C0040 Honda

C0040 Honda Code - Brake Lamp Switch Failure

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Brake Lamp Switch. Common causes include Faulty Brake Lamp Switch, Brake Lamp Switch harness is open or shorted, Brake Lamp Switch 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: C0040 Honda indicates Brake Lamp Switch Failure.
Common causes: Common causes include Faulty Brake Lamp Switch, Brake Lamp Switch harness is open or shorted, Brake Lamp Switch 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 5,392

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 May 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0040 Honda Description

The Anti-Lock Brake System (ABS) Module monitors the Brake Lamp Switch. The ABS Module sets the OBDII code when the Brake Lamp Switch is not to factory specifications.

OBDII Code C0040 Honda - Brake Lamp Switch Failure - AutoCodes.com — C0040 Honda Code - Brake Lamp Switch Failure

What does this mean?

What are the Possible Causes of the DTC C0040 Honda?

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

How to Fix the DTC C0040 Honda?

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 C0040 Honda 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 C0040 Honda code?

Need more information on how to fix the C0040 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0040 Honda code diagnosed by a professional: Find a repair shop in your area

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 C0040 Honda Code

1. What are the common symptoms of OBDII code C0040 in a Honda related to brake lamp switch failure?

The common symptoms include non-functioning brake lights, the inability to shift out of park, and the illumination of the brake warning light on the dashboard.

2. What are the potential causes of OBDII code C0040 in a Honda indicating brake lamp switch failure?

The code C0040 is typically triggered by a faulty brake lamp switch, which may be due to a wiring issue, a defective switch, or a misaligned switch position.

3. How can I diagnose a brake lamp switch failure causing OBDII code C0040 in my Honda?

You can diagnose a brake lamp switch failure by checking the brake lights, ensuring the switch is properly aligned and functioning, and using an OBDII scanner to retrieve the specific diagnostic trouble code.

4. Can a brake lamp switch failure causing OBDII code C0040 in a Honda be repaired easily?

Yes, repairing a brake lamp switch failure is usually a straightforward process that involves replacing the faulty switch, adjusting its position, or repairing any damaged wiring.

5. Is it safe to continue driving a Honda with OBDII code C0040 related to brake lamp switch failure?

It is not recommended to drive the vehicle with a brake lamp switch failure, as it can compromise safety by affecting brake light visibility to other drivers and potentially causing shifting issues.

6. Will resetting the OBDII code C0040 in a Honda resolve the brake lamp switch failure issue?

Resetting the code may temporarily turn off the warning light, but it will not fix the underlying brake lamp switch failure. The issue should be diagnosed and repaired to ensure proper brake light functionality.

7. Can a DIY enthusiast replace the brake lamp switch in a Honda to address OBDII code C0040?

Yes, replacing the brake lamp switch in a Honda is a task that can be performed by a DIY enthusiast with basic automotive knowledge and the right tools. However, if unsure, it's best to consult a professional mechanic.

8. How much does it typically cost to repair a brake lamp switch failure causing OBDII code C0040 in a Honda?

The cost of repairing a brake lamp switch failure can vary depending on the model of the Honda, the labor rates of the repair shop, and whether any additional parts or wiring repairs are needed. It is advisable to obtain quotes from different shops.

9. Are there any preventive maintenance tips to avoid OBDII code C0040 due to brake lamp switch failure in a Honda?

Regularly checking and ensuring the proper functioning of the brake lights, promptly addressing any lighting issues, and conducting routine inspections of the brake lamp switch can help prevent OBDII code C0040 related to brake lamp switch failure.

10. Can a malfunctioning brake lamp switch causing OBDII code C0040 affect other systems in a Honda?

Yes, a malfunctioning brake lamp switch can potentially affect other systems in the vehicle, such as the transmission control module, cruise control, and ABS system, due to the interconnected nature of the electrical components.