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Mike V
Dodge Dakota
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7/20/2004
16:46:08

Subject: "Evaporative System Large Leak"
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Hey Everyone,

I found this forum by searching for solutions for a problem my Dakota has. Check engine light came on and I had it checked out by a friend who works for a tranny shop.. the code that came back was :Evaporative System large leak" Any one know what that exactly is?


thanks In advance.

Mike V-
Colorado



Mike V
Dodge Dakota
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7/20/2004
16:52:57

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Oh by the way its a 2001 Dodge Dakota 4.7 V-8 Club cab


Mike





parts guy
Dodge Dakota
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7/20/2004
16:54:34

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do you have a code p0455? most likely cause is the fuel cap. usually set the code after getting gas. check to see if the cap is tight and it helps to shut the car off when filling up thats when the pcm sees the large leak when the caps off and the car is running



parts guy
Dodge Dakota
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7/20/2004
16:56:23

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the light will go out after 10-15 starts with the cap on as long as the light isnt flashing the car is ok



Mike V
Dodge Dakota
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7/20/2004
16:59:00

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U know he didnt tell me the exaclt code number.

I did check the gas gap and it seems fine. He cleared the code for now .. if or when it comes back I will find the exat code number.


thanks

Mike V-




Mike V
Dodge Dakota
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7/20/2004
17:01:27

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Yea no flashing for now.. and It remained on longer than 15 starts. :/



Webtiger
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7/21/2004
00:32:24

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Mike;
I had this happen 3 times in a row dealer replaced the gas cap for free problem solved

Ken Grierson

dodgetech02
Dodge Dakota
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7/21/2004
09:34:48

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look for rust int the center of the gas cap the check ball will rust in the cap and will set your eng. light also look in front of your gas tank under your truck at the evap canster look for split rubber lines this will be a good place to start



Mike V
Dodge Dakota
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7/21/2004
10:39:00

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I will check those out.. thanks for the help once again.


Thanks

Mike V-



rick ramos
Dodge Dakota
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10/07/2008
20:59:14

RE: response to p0455 code large evap system leak
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I have a 2001 dodge dakota getting same code with engine light on. have replaced the gas cap and reset the code several times after a day or so the light comes back on with same code. Any other ideas.



intensedak39
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10/07/2008
22:24:01

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check all the vacuum lines from the purge solenoid to the fuel tank. usually if it's a gas cap, it's a small evaporate leak, not a large.

the code doesnt really tell you to look in one particular place. you'll just have to search it out and find the leak. i've seen the code on a 2001 ram and had to replace the hose assembly from the purge to the tank. i've also seen it on a mustang and had to replace the filler neck tube from the gas tank to the quarter panel.



MooseLoad
Dodge Dakota
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10/13/2008
14:43:52

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Take a look at the EVAP canister under the drivers side of the truck, just fwd of the fuel tank. I have the same codes on my 2003 dakota and when i got under the truck today to change the oil I found ALL of the runnber hoses to the EVAP canister split. Changed them out and we shall see...



Ryan
Dodge Dakota
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11/04/2013
14:18:53

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I had an error code for a "small evap system leak" P0442. Changing out the gas cap solved the problem. The new gas cap I got even has a label on it that says if you don't tighten it down then the check engine light will come on.

If this doesn't solve the problem for you, then you may have a leak somewhere else in the system. My mechanic says they can diagnose where that leak is using a fog system, and this service costs around $60.



Sal
Dodge Dakota
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2/21/2023
09:35:58

RE: 2001 Dodge Dakota
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After filling up my engine light
went on ... the cap was not the problem
with only 140K miles and a history of evac code
p0442 it was the two curved hoses with clamps
fixed the problem ... local auto repair shops have
to be avoided, with my extensive experience,
I was faced with $50 to put my Dodge on their lift
my brother auto mechanic warned me about such
a scheme once on the lift the shop will most likly
tell you it's the canister part @ $200 plus hoses
YOU CAN DO THIS EASILY THE SET ON AMAZON WAS $11
PLUS $10 FOR A NEW CAP ...
USE COMPRESSION CLAMPS ... THESE SITES ARE FANTASTIC AND PROVIDE EXCELLENT INFO



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