Codes P0440 and P0441, engine stalls or shuts off at low RPM's

These codes are for the EVAP emission system. This is pretty typical when the purge valve is sticking allowing too much fuel vapor into the engine and it causes a stutter or stall.

I attached the testing for the code P0440 which will lead you to the issue however, I suspect you need a purge solenoid valve. I attached that process as well.

Also, you should check your charcoal canister for raw fuel in it as this would be the root cause of the purge failing. Basically, the raw fuel gets into the canister and breaks down the charcoal. Then that clogs the purge solenoid and causes is to allow too much fuel vapor into the engine.

Let me know if you have questions. Thanks

Hi,

Interestingly, both of these codes are related to the evaporative emissions system, specifically the canister purge system. The hard part with this is this. There is a purge valve solenoid under the hood of the vehicle. When it is commanded to open, it allows fumes from the fuel tank to enter the intake manifold to be burned. If you look at pic 1 below, it shows an approx location. Pic 2 shows the solenoid. It is mounted to the air filter box. I need you to check that vacuum supply and make sure the hoses are good and connected. I circled the solenoid and put AF on the air filter box.

Next, is the actual evap canister. It is located near the fuel tank. If you look at pic 2, it shows the location and then I circled several vacuum hoses. Any of these hoses could be disconnected, damaged, pinched, or missing and causing this issue. So that is what needs checked.

Now, here is what I suggest. First, check for a damaged vacuum hose or any leaks. If nothing is found, then I recommend having the EVAP system smoke tested. Basically, a machine pumps smoke into the system at a very low pressure. If there is a leak, smoke will come out.

Also, the idea that there is an idle issue and stalling, it is very possible that the purge solenoid is stuck open or there is an engine vacuum leak from one of the hoses I mentioned.

Please feel free to let me know if you have other questions. Also, if you have a chance, let me know what you find.

Take care,
Joe

If the solenoid under the hood is needing replaced, you shouldn't have any trouble. At the canister, that is difficult because it's above the fuel tank.

As far as brand, Mopar parts will be the best for the vehicle. However, price may make it crazy to purchase. Dorman is a great name in automotive, so I wouldn't worry if that is the one you get. I use their parts all the time without issue.

Let me know what you find.

Joe

Yes. That appears correct. The Mopar part number is 4591733AA for this part. I agree that price sounds high so it may be a good idea to get a second price. However, they are not hard to replace. I attached the instructions if you need them.

Thanks