Mitsubishi Endeavor P0446: EVAP Vent Control Circuit → Malfunction

The most frequent trouble code with the Mitsubishi Endeavor The Code P0446. The trouble code refers to a number you receive when your Endeavor is plugged into an OBDII scanner. It indicates that an error has occurred in the evaporative emission controller system. This code is often found with P0421, P0441 or P0440.

P0446: Evaporative Emission Control System → Vent Control Circuit → Malfunction

The P0446 problem is not usually a serious threat to your car's driveability. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though. This is usually accompanied by P0442. Another common code for trouble is P0420. It often comes with P0446.



Índice de Contenido
  1. Mitsubishi Endeavor P0446 OBDII Code Symptoms
  2. Mitsubishi Endeavor P0446 Meaning
  3. Endeavor P0446 Trouble code Causes
  4. P0446 Diagnosis- Mitsubishi Endeavor
  5. Most common P0446 fixes

Mitsubishi Endeavor P0446 OBDII Code Symptoms

Mitsubishi Endeavor P0446 OBDII Code
The check engine lamp is usually the sole symptom of P0446.


Most commonly, the P0446 code does not cause any symptoms. You will see the light on your service engine shortly, but this is typically it. A slight drop in fuel economy is not uncommon. You may notice a gas smell after using P0446. Because it is related to the fuel vapor system, P0446 may also cause a slight gas smell.


Mitsubishi Endeavor P0446 Meaning

P0446 Mitsubishi Endeavor

The universal OBDII code P0446 can be used to diagnose trouble codes. It means that no matter what make or model vehicle you have, this code will still mean the exact same thing. Technically, the code stands for:

Evaporative Emission Control System Vent Control Circuit Malfunction

The EVAP system collects fuel vapor from fuel tanks and then sends it to the intake of the engine to ignite the normal combustion process. If the EVAP control circuit vent control circuit does not respond to the ECU it will throw the OBDII code P0446 and the service engine light soon will illuminate.


Endeavor P0446 Trouble code Causes

Mitsubishi Endeavor P0446 Diagnosis

P0446 can be triggered by many factors in Mitsubishi Endeavor. These are some of the more common issues that can trigger the P0446 code.


  • Vapor Canister Purge Valve– One of the most common causes of the P0446 code is the vapor canister purge valve. It’s really easy to replace. You will need to locate and take out a few clips.
  • EVAP System Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This can lead to the code P0446. You should look for a hole or a tear in the fabric.
  • A Faulty Canister of Charcoal– The charcoal canister is often the cause of P0446.
  • Fuel Tank Sending Unit– It is possible for the fuel tank sending unit to go bad. It can cause a disruption in the line pressure, throwing off the code.
  • Fuel Cap– A bad fuel cap can cause the code to be thrown for sure. Often, you’ll get a message informing you that the fuel cap is off even when it is on. It may be worth your time to get that message and a P0446 to check if the fuel cap is working.
  • Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. The gasket may dry out especially if the vehicle is in dry conditions. When it dries out, the fuel tank can’t hold pressure anymore.


P0446 Diagnosis- Mitsubishi Endeavor

The mechanic will have a lot of different tools at his disposal in order to determine the cause of your Mitsubishi Endeavor P0446. The most commonly used methods to diagnose this code are:

  • The mechanic will usually check for any additional trouble codes. It is easier to diagnose problems if there are more codes. That’s because when they appear together in certain combinations, there will often only be only a few conditions that will throw any combination of codes at one time.
  • The mechanic will normally determine what trouble codes are associated with P0446. Check out the EVAP System. It includes the purge valve and line as well as the canister.
  • To ensure that the cap can withstand pressure, the mechanic will check it. If you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.
  • Monitor and check the pressure in your fuel tank.
  • The mechanic will then perform the following tests after completing the above-mentioned checks:
  • A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.


Most common P0446 fixes

P0446 Mitsubishi Endeavor Fix

Below are the top Endeavor fixes for P0446:

  • Replacing the gas cap
  • Replacement for EVAP Line
  • Replace charcoal canister
  • Replacing the fuel tank

It is best to begin with the gas cap, and then work your way up to the fuel tanks. The gas cap is the most difficult and cost-effective item to replace.

Here’s a great video on How to check your gas cap.

We wish you all the best in finding out why your Mitsubishi Endeavor is throwing the P0446 codes. We trust this helped. Please leave us a comment below if you have any suggestions. You have a wonderful day.

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