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Posted on Aug 26, 2011
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No, the car is giving codes P0456 and P0440. Can you tell me what they are?

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  • Master 3,301 Answers
  • Posted on Aug 26, 2011
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P0440 Evaporative Emission Control System Malfunction P0446 Evaporative Emission Control System Vent Control Circuit Malfunction Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
Now , did you just get gas? remove the gas cap, and have it checked, tighten it down good,, have the codes cleared, and then check for codes again,, this may be all it is ,,,

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0helpful
1answer

How to fix error code P0456 P0455 P0440

Your best bet , take it to a qualified repair shop an have the EVAP system smoke tested to find the leak .
2helpful
1answer

Have codes P0456, P0440 and P0480 on my check engine lite for a 2002 Duraango

P0440 Evaporative Emission Control System Malfunction P0456 Evaporative Emission Control System Leak Detected (very small leak) ... P0480 Cooling Fan 1 Control Circuit Malfunction

po456 -Several things can cause such a leak. Perhaps the most common is simply a loose or defective fuel filler cap! Check the gasket on the cap to make sure it's okay, and tighten the cap until it clicks after you've gassed up. You can't over-tighten it, so give it several clicks to make sure it's tight. If you have any doubt about it, get a replacement cap.

The next thing to check would be the hoses. Look for any cracks or splits, and check all the connections for looseness or breaks. Also, check the Evap Canister itself for any cracks or other damage.

From there, you'll need to check the Vapor Management Valve. With no power to it, it should be closed. If you can blow through it at all, it's probably bad. There's also a Evap Canister Vent Valve: it should be normally open.

Finally, check the wires from the Vapor Management Valve to the PCM. Make sure they have good continuity, and aren't shorted to each other or to ground. Check the wires to the Evap Canister Vent Valve as well.

If you haven't found the answer after eliminating all these, it's time to take the car to your favorite shop!
1helpful
5answers

Hi I have a Dodge Neon 2003 with engine codes P0456 and P0440. What do these mean and how do I fix them

P0456....Evaporative Emission Control System Leak Detected (very small leak)


P0440....Evaporative Emission Control System

7helpful
1answer

Diagnostic code p0456 and p0440 on 2003 dodge durango

p0456
Evaporative emission (EVAP) control system leak detected (very small leak)
p0440
Evaporative emission control system malfunction
1helpful
1answer

I have an 03 Ram 1500, engine light is on, I had

p0440 - Evap. system performance (this could be something as simple as not turning the gas cap several times after you fill up.

p0456 - Evap leak monitor Small leak detected. - Could be related to the previous code.

p2106 - Throttle Actuator Control System - Forced limited power : This one you might have noticed the vehicle running rough, overdrive not working properly and cruise control will not set.

p2175 - Throttle Actuator Control System - Low airflow detected.

What you might want to try first is have the codes cleared which most auto parts stores offer this for nothing (unless you have a programmer then you can do it yourself). Pour in some fuel injector cleaner into your gas, put a new air filter on. And when you fill up your gas tank, crank the cap several times when you put it back on.
See if the codes come back on after that.
0helpful
1answer

P0442 p0456 p0440 dodge durango engine codes my girlfriend was driving and diddnt put oil n there 4 a while and the engine cutt off and locked...wat should i do?

Buy a used engine from a reputable wrecking yard. That is the least expensive soulution. Then..........teach your girlfriend, where the dip-stick is!
3helpful
1answer

P0442 p0456 p0440 dodge durango engine codes

replace your evap solenoid this should fix it.
1helpful
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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
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