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Engine-Codes – Generic – P0440

P0440 Code - Evaporative Emission Control System Malfunction

Quick Answer

The P0440 code indicates a malfunction in the vehicle's evaporative emission control system. Common causes include Loose or damaged gas cap, Cracked or disconnected hoses in the evaporative emission control system, Faulty purge valve. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P0440 indicates Evaporative Emission Control System Malfunction.
Common causes
Common causes include Loose or damaged gas cap, Cracked or disconnected hoses in the evaporative emission control system, Faulty purge valve.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0440 Description

The P0440 code indicates a malfunction in the vehicle's evaporative emission control system. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. When this code is triggered, it means that there is a leak or malfunction in the system that is preventing it from operating effectively. This can lead to increased emissions, decreased fuel efficiency, and potentially even engine performance issues.

OBDII Code P0440 - Evaporative Emission Control System Malfunction
P0440 Code - Evaporative Emission Control System Malfunction

Common Causes of P0440

  1. Loose or damaged gas cap
  2. Cracked or disconnected hoses in the evaporative emission control system
  3. Faulty purge valve
  4. Defective charcoal canister
  5. Wiring issues or electrical faults

Symptoms of P0440

  1. Check Engine Light is illuminated
  2. Strong gasoline smell coming from the vehicle
  3. Decreased fuel efficiency
  4. Rough idling or stalling
  5. Failed emissions test

How to Fix P0440

  1. Check the gas cap and tighten or replace if necessary
  2. Inspect and replace any damaged hoses in the evaporative emission control system
  3. Test and replace the purge valve if faulty
  4. Check and replace the charcoal canister if needed
  5. Clear the diagnostic trouble codes and perform a test drive to ensure the issue is resolved

Cost to Fix P0440

The cost of repairing a P0440 code can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $50 to $150. Overall, the total repair cost for this issue is typically between $100 and $350. However, as mentioned earlier, actual costs can vary based on location, vehicle make and model, and the rates charged by the auto repair shop. It is recommended to get a detailed estimate from a trusted mechanic before proceeding with the repair.

What does this mean?

Tech Notes for P0440

The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code.









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When is the Code Detected?

Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.

Need more information about the P0440 code?

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Code P0440 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 P0440 Code

1. What are the common symptoms of OBDII code P0440?

The common symptoms of OBDII code P0440 include the illumination of the check engine light on the dashboard and a possible gasoline odor around the vehicle.

2. What are the potential causes of OBDII code P0440?

Potential causes of OBDII code P0440 may include a loose or damaged gas cap, a faulty EVAP system purge valve, a leak in the EVAP system, or a malfunctioning EVAP canister.

3. How serious is OBDII code P0440?

While OBDII code P0440 is not typically a critical issue that affects the drivability of the vehicle, it can lead to increased emissions and may cause the vehicle to fail an emissions test.

4. How can I diagnose the cause of OBDII code P0440?

To diagnose the cause of OBDII code P0440, you can start by checking the gas cap to ensure it is tight and in good condition. You may also need to inspect the EVAP system components for any visible damage or leaks.

5. Can I continue driving with OBDII code P0440?

It is generally safe to continue driving with OBDII code P0440, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent any potential long-term problems with the EVAP system.

6. How can I repair OBDII code P0440?

Repairing OBDII code P0440 may involve tightening or replacing the gas cap, replacing a faulty purge valve or canister, repairing leaks in the EVAP system, or clearing any blockages in the system.

7. Will resetting the check engine light fix OBDII code P0440?

Simply resetting the check engine light will not fix OBDII code P0440. It is important to diagnose the root cause of the code and address any underlying issues to prevent the code from reoccurring.

8. How much does it cost to repair OBDII code P0440?

The cost of repairing OBDII code P0440 can vary depending on the cause of the issue and the specific components that need to be repaired or replaced. Costs may range from a simple gas cap replacement to more extensive EVAP system repairs.

9. Can a DIY enthusiast fix OBDII code P0440?

A DIY enthusiast with some automotive knowledge and tools may be able to address OBDII code P0440, especially if it involves a straightforward fix like tightening the gas cap. However, more complex issues may require professional diagnosis and repair.

10. How can I prevent OBDII code P0440 from occurring in the future?

To prevent OBDII code P0440 from occurring in the future, it is essential to regularly inspect the gas cap for tightness and damage, perform routine maintenance on the EVAP system, and address any issues promptly to maintain the system's integrity.

Discuss the causes and fixes for P0440 OBDII Code

Submit a New Comment

  • After smoking my vehicle several times. The location was finally found. It was under the car near the rear of the fuel tank. There is a little valve which has a very tiny crack which needs replacing.

    Reply to Comment

  • Sorry, this was the fix for a P0440.

    Reply to Comment

  • I have a 02 Toyota 4Runner. What should I do first to get rid of this code? Mahalo for your help

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