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P0440 Mitsubishi Code - EVAP Control System Malfunction

Quick Answer

The P0440 code in a Mitsubishi indicates a malfunction in the EVAP (Evaporative Emission Control) system. Common causes include Loose or damaged gas cap, Malfunctioning purge valve, Faulty vent 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 Mitsubishi indicates EVAP Control System Malfunction.
Common causes
Common causes include Loose or damaged gas cap, Malfunctioning purge valve, Faulty vent 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 07, 2024
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Code P0440 Mitsubishi Description

The P0440 code in a Mitsubishi indicates a malfunction in the EVAP (Evaporative Emission Control) system. This system is responsible for capturing and storing fuel vapors before they can escape into the atmosphere. The malfunction could be due to a variety of issues, such as a leak in the system, a faulty purge valve, a malfunctioning vent valve, or a problem with the charcoal canister.

OBDII Code P0440 Mitsubishi - EVAP Control System Malfunction
P0440 Mitsubishi Code - EVAP Control System Malfunction

Common Causes of P0440 Mitsubishi

  1. Loose or damaged gas cap
  2. Malfunctioning purge valve
  3. Faulty vent valve
  4. Leak in EVAP system hoses
  5. Charcoal canister saturated with fuel

Symptoms of P0440 Mitsubishi

  1. Check Engine Light illuminated
  2. Strong fuel odor
  3. Rough idling or stalling
  4. Decreased fuel efficiency
  5. Failed emission test

How to Fix P0440 Mitsubishi

  1. Check gas cap: The first step is to ensure the gas cap is tightened properly. If it is loose, tighten it and reset the Check Engine Light.
  2. Inspect EVAP system: Check for any visible damage or leaks in the EVAP system components, including hoses, valves, and canister.
  3. Test purge valve: Use a multimeter to test the functionality of the purge valve. Replace if necessary.
  4. Test vent valve: Similarly, test the vent valve for proper operation and replace if faulty.
  5. Replace charcoal canister: If the charcoal canister is saturated with fuel, it will need to be replaced to restore the EVAP system's functionality.

Cost to Fix P0440 Mitsubishi

The cost of repairing a P0440 code in a Mitsubishi can vary depending on the specific cause of the issue. On average, the parts required for the repair, such as a new purge valve or charcoal canister, can range from $100 to $300. Labor costs at auto repair shops typically range from $80 to $150 per hour. Therefore, the total repair cost could range from $200 to $500 or more, depending on the severity of the issue and the labor rates in your area. It is recommended to consult with a qualified mechanic to get an accurate estimate for your specific vehicle.

What does this mean?

Tech Notes for P0440 Mitsubishi

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.

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 Mitsubishi code?

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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 Mitsubishi Code

1. What are common symptoms of OBDII code P0440 in a Mitsubishi related to the EVAP control system malfunction?

- Common symptoms include the check engine light illuminating, a strong fuel odor, and possible issues with vehicle performance.

2. What are the possible causes of OBDII code P0440 in a Mitsubishi?

- The code P0440 in a Mitsubishi may be triggered by a loose gas cap, a faulty EVAP system purge valve, a leak in the EVAP system, or a malfunctioning charcoal canister.

3. How can I diagnose the source of the EVAP control system malfunction triggering OBDII code P0440 in my Mitsubishi?

- Diagnosing the issue may involve checking the gas cap for tightness, inspecting the EVAP system components for leaks, and using a scan tool to monitor the EVAP system operation.

4. Can a loose gas cap really cause OBDII code P0440 in a Mitsubishi?

- Yes, a loose or improperly sealed gas cap can lead to a drop in system pressure, triggering the OBDII code P0440 related to the EVAP control system malfunction in a Mitsubishi.

5. Is it safe to continue driving my Mitsubishi with OBDII code P0440 indicating an EVAP control system malfunction?

- While the vehicle may still be safe to drive, it is recommended to address the issue promptly to prevent potential fuel leaks, emissions problems, or damage to other components.

6. How can I repair OBDII code P0440 in my Mitsubishi caused by a faulty EVAP system purge valve?

- To repair P0440 due to a bad purge valve, you may need to replace the faulty component with a new one following the manufacturer's recommended procedures.

7. What are some general tips for repairing a leak in the EVAP system that is causing OBDII code P0440 in a Mitsubishi?

- Repairing a leak in the EVAP system may involve visually inspecting the components for damage, replacing or repairing the affected parts, and testing the system to ensure proper function.

8. Can a clogged charcoal canister trigger OBDII code P0440 in a Mitsubishi?

- Yes, a clogged charcoal canister can restrict the flow of vapor through the EVAP system, leading to a malfunction and triggering the OBDII code P0440 in a Mitsubishi.

9. How long does it typically take to repair OBDII code P0440 related to an EVAP control system malfunction in a Mitsubishi?

- The repair time for OBDII code P0440 can vary depending on the specific cause of the issue, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.

10. Can resetting the check engine light temporarily resolve OBDII code P0440 in a Mitsubishi?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing OBDII code P0440 is not addressed, the light is likely to come back on once the problem is detected again.

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