Code p 0440 refers to the EVAP system --purge valve malfunction
check wiring and replace the purge valve
SOURCE: EVAP control system problems - P0440 and P0456 codes
1) Determine the engine code cause for the Check Engine Light (C.E.L. or CEL)
2) Insert key into ignition
3) turn key to "on" posittion without starting the vehicle
4) VERY VERY quickly turn the key off one click, then on, then off,
then on; cycling for 3 turns of the key (NOTE: you might have to try
this a couple of times to get it just right)
5) leave on, and read the engine diagnostic code(s) that are output in the mileage counter
6) We got Code P0440 (or P 0440 or P-0440) (variations inserted for search engines)
7) A quick search of the web yielded about 3 or 4 usefull details.
8) Diagnostic code P0440 is the Evaporative Emissions Control System
Malfunction (failure) of some type. Details of this type of failure and
what the Evap System does for you:
9) Other web pages indicated it might be as simple as the Gas Cap being seated incorrectly, or not sealing correctly any more
10) I took it off, yes it was seated incorrectly, and reseatted it firmly
11) Now you need to clear the Check Engine Light indicator (it will
clear *eventually* over time if this is TRULY the problem - I recommend
you clear it now - that way is a deeper problem with the EVAP system
exists, it should come on again - giving another clue something else is
amiss
12) One suggestion was to take the Negative (black) cable off the
battery for 10 to 20 seconds -- I did - for 30 seconds to be sure
13) You *must* turn the Engine on and start the vehicle all the way
before the Check Engine Light might clear - if it doesn't try the
following:
14) Turn the ignition on 50 times - yes - 50 times - but be careful,
every time you cycle the ignition on (without starting the vehicle) you
are turning on the Fuel Pump - continuous cycling can theoretically
(according to some posts) cause it to heat up and be damaged - so every
10 times stop and let it rest for a full minute to cool down.
15) After 30 times of doing this (3 sets of 10), turn the engine fully
on - see if the check engine light goes off) if it doesn't, do the
remaining 20 times (2 sets of 10).
16) if it still doesn't go off, you may have a deeper issue that might require attention of the mechanics
SOURCE: 2005 Chrysler Town & Country Check engine light came on.
Replace the EGR valve, the code is for EGR system performance
SOURCE: Check valve missing in fuel tank filler neck.
P1444 Purge Flow Sensor Circuit Input Low
0
The evaporative emission control system checks to make sure there are no leaks in the lines that run from the gas tank to the charcoal canister and up to the engine. It also checks to make sure the gas cap is sealing correctly.
When you fill your car with gas, the vapors in the tank get forced into a canister filled with activated charcoal. Also, on a hot day as the gas heats up and vaporizes, those same vapors push into the canister where they're stored. But the charcoal can only hold so much vapor. At some point it has to be emptied. The emptying process is called "canister purge." Here's how it works.
The computer orders a canister purge by powering open a PURGE solenoid. That opens the vacuum line between the canister and the intake manifold. At the same time, it opens a VENT solenoid. That allows fresh air into the canister. So the engine is literally sucking out the gas vapors and purging the canister with fresh air. The computer has to adapt its fuel strategy to take advantage of all the extra gas vapors coming into the engine.
The computer notices the canister is empty when it detects a leaner condition (all the vapors are used up) and it resumes normal fuel delivery. Some car manufacturers then close the VENT solenoid but leave the PURGE solenoid open. That creates a vacuum throughout the entire fuel storage system. Once the correct vacuum is reached, it closed the PURGE solenoid and waits to see if the vacuum holds. If it doesn, the system passes the test. If it detects a leak, it sets a code.
In this code P1444, the computer sees a lower than expected value on the purge flow sensor. bottom line? replace the purge flow sensor.
SOURCE: I have a 2004 Chrysler Town and Country and my
P0440:
P0441:
Bad vacuum switch
SOURCE: 07 chrysler sebring check engine light and gascap
It might take 2 or 3 gas fill-ups before the light goes off. Don't worry.
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Hi Frank LaBarbera, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Have you checked the canister for cracks or loose hoses?
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