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P0442 Mitsubishi Code - EVAP System Small Leak Detected

Quick Answer

The P0442 code for Mitsubishi indicates that the Engine Control Module (ECM) has detected a small leak in the EVAP (Evaporative Emission Control) system. Common causes include Loose or damaged gas cap, Cracked or damaged EVAP hoses, Faulty EVAP 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
P0442 Mitsubishi indicates EVAP System Small Leak Detected.
Common causes
Common causes include Loose or damaged gas cap, Cracked or damaged EVAP hoses, Faulty EVAP 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 Aug 30, 2024
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Code P0442 Mitsubishi Description

The P0442 code for Mitsubishi indicates that the Engine Control Module (ECM) has detected a small leak in the EVAP (Evaporative Emission Control) system. This system is responsible for capturing and storing fuel vapors that would otherwise be released into the atmosphere. A small leak can allow these harmful emissions to escape, leading to increased pollution and potentially affecting the vehicle's overall performance.

OBDII Code P0442 Mitsubishi - EVAP System Small Leak Detected
P0442 Mitsubishi Code - EVAP System Small Leak Detected

Common Causes of P0442 Mitsubishi

  1. Loose or damaged gas cap
  2. Cracked or damaged EVAP hoses
  3. Faulty EVAP purge valve
  4. Leaking charcoal canister
  5. Malfunctioning EVAP pressure sensor

Symptoms of P0442 Mitsubishi

  1. Check Engine Light illuminated
  2. Smell of fuel vapors around the vehicle
  3. Decreased fuel efficiency
  4. Rough idling or stalling
  5. Failed emissions test

How to Fix P0442 Mitsubishi

  1. Check and tighten or replace the gas cap
  2. Inspect EVAP hoses for cracks or damage and replace as necessary
  3. Test and replace the EVAP purge valve if faulty
  4. Check and replace the charcoal canister if leaking
  5. Test and replace the EVAP pressure sensor if needed

Cost to Fix P0442 Mitsubishi

The cost for repairing a P0442 code can vary depending on the specific cause of the issue. On average, the parts for this repair can range from $50 to $200, while labor costs can be around $100 to $200. Keep in mind that these are rough estimates, and actual costs may differ based on location, vehicle make and model, and the repair shop's labor rates. It's recommended to obtain quotes from several shops to determine the most accurate cost for your specific situation.

What does this mean?

Tech Notes for P0442 Mitsubishi

The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0442 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 P0442 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 P0442 Mitsubishi Code

1. What does the OBDII code P0442 for Mitsubishi mean?

The code P0442 indicates that the EVAP system has detected a small leak in the system, specifically in the evaporative emission control system.

2. What are the common symptoms of a P0442 code in a Mitsubishi?

Common symptoms of a P0442 code include the check engine light coming on, a slight decrease in fuel efficiency, and potentially a noticeable gasoline odor around the vehicle.

3. What are some possible causes of the P0442 code in a Mitsubishi?

Possible causes of a P0442 code include a loose or damaged gas cap, a cracked or damaged EVAP system hose, a faulty EVAP canister purge valve, or a leak in the EVAP system.

4. How serious is a P0442 code in a Mitsubishi?

While a P0442 code is not an emergency situation, it should not be ignored. Ignoring the code could lead to increased emissions, reduced fuel efficiency, and potential damage to the vehicle's emission control system.

5. How can I diagnose a P0442 code in my Mitsubishi?

Diagnosing a P0442 code typically involves inspecting the gas cap for tightness, visually checking the EVAP system components for damage or leaks, and using a smoke machine to pinpoint the exact location of the leak.

6. Can I repair a P0442 code in my Mitsubishi myself?

Depending on the cause of the P0442 code, some repairs can be done by a DIY enthusiast. Replacing a faulty gas cap or a damaged EVAP system hose may be manageable, but more complex issues may require professional assistance.

7. How much does it cost to repair a P0442 code in a Mitsubishi?

The cost of repairing a P0442 code can vary widely depending on the specific cause of the issue. Simple fixes like replacing a gas cap may cost under $50, while more complex repairs involving the EVAP system components could range from $100 to $500 or more.

8. Will a P0442 code in my Mitsubishi affect its performance?

In most cases, a P0442 code will not have a significant impact on the performance of the vehicle. However, ignoring the code could potentially lead to more serious issues over time, so it's best to address the problem promptly.

9. Can a P0442 code in a Mitsubishi clear on its own?

In some cases, a P0442 code may clear on its own after a few driving cycles if the issue was minor or temporary. However, if the problem persists, it's recommended to diagnose and repair the underlying cause to prevent further issues.

10. How can I prevent a P0442 code from recurring in my Mitsubishi?

To prevent a P0442 code from recurring, make sure to tighten the gas cap properly after refueling, avoid overfilling the fuel tank, and regularly inspect the EVAP system components for any signs of damage or wear.

Discuss the causes and fixes for P0442 Mitsubishi OBDII Code

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  • Saludos , tengo mitsubishi outlander asx sport 2011 con código p0442 pequeña fuga detectada del EVAP para saber posibles causas , pero de casualidad le apago la luz del service soon le lleno el tanque de gasolina y me prende la luz de service soon cuando llega a medio tanque que podría ser o si alguien le a pasado lo mismo.

    Reply to Comment

  • Podria se la tapadera del tanque de gasolina. Le recomiendo que comience con eso.

    Reply to Comment

  • Hi all!,
    I just got my engine light on, and when checking the code i got this P0442 code. The interesting thing is that it came on right after i accelerated rather forcefully to join a highway. I checked the gas cap, but it is tightly closed so it does not seem to be the reason(unless the gasket is broken and is not working as expected). I dont perceive any gasoline odor. Any ideas what i should be checking ?

    Reply to Comment

  • Unfortunately there are many things that could set the P0442 code. Let me check what are the most common problems for your vehicle. What is the model and year of your vehicle?

    Reply to Comment

  • Lancer ES 2005. a bit old, but have been running without problems since i got it. Just lately the engine check has turn on twice.. first time it was the Oxy sensor (replaced and worked fine), and now this.

    Reply to Comment

  • According to a national database of repairs, here are the most likely cause for the P0442 code for your model year.

    Gas Cap - 84 times the Gas Cap was the problem
    Fuel Tank - 14
    Evap Canister Vent Solenoid - 9
    Evap Line - 5
    Powertrain Control Module - 5
    Fuel Filler Neck - 4
    Evap Canister Filter - 3

    Since there are too many thing that can set the P0442 code, I recommend starting with the gas cap. Usually is the gas cap seal that fails and let the gas escape.

    Reply to Comment

  • Thanks!.. i will double check on the gas cap. I hope i am lucky enough to be on the top reason the problem shows up.

    Reply to Comment

  • Yuuup, it was the gas cap. I just replaced it and drove ~100 miles after resetting the engine light, and it never came on. Thanks!

    Reply to Comment
    1. Replaced gas tank fuel cab with brand new.
    2. Replaced purge valve with brand new.

    Now, the code 0456 was gone and after a week. the Code 0442 came out. what will be next to do?

    Reply to Comment

    • Thanks for the detailed info. You’re definitely heading in the right direction—P0456 and P0442 are both EVAP small leak codes, and sometimes fixing one just exposes the next weakest point.

      Here’s what I’d check next:

      1. EVAP vent valve (canister side) – If it’s sticking open or not sealing fully, it can trigger a small leak code like P0442. Even if the purge valve is new, the vent side needs to seal during the self-test.

      2. Charcoal canister and hoses – Check for any cracked or loose hoses between the tank, canister, and valves. Over time, heat and age cause small cracks that are hard to see but leak under pressure.

      3. Smoke test – This is the fastest way to find small EVAP leaks. A shop can pressurize the system with harmless smoke and look for leaks around the filler neck, top of the tank, or connections.

      4. Fuel tank pressure sensor – Rare, but if it gives bad readings, it can trigger small leak codes even if the system is sealed. Only check this if everything else looks solid.

      Since P0442 is a small leak, it's usually something minor like a cracked hose, vent valve issue, or loose connection. If you can’t spot anything obvious, I’d recommend a smoke test before replacing more parts.

      Reply to Comment