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P0442 Code

Slickgib

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Slickgib Enthusiast

Slickgib

Posted
Posted

I keep getting this code.. i tried the new gas cap and i still get it.... should i just take it to the deal and pay the gazillion dollars to fix it or are there any idea that some one could walk me through to get this fixed.. and if i just reset it.. whats the chances that if i try to smog my truck that the light will come on????

Norseman Senior Enthusiast

Norseman

Posted
Posted
I keep getting this code.. i tried the new gas cap and i still get it.... should i just take it to the deal and pay the gazillion dollars to fix it or are there any idea that some one could walk me through to get this fixed.. and if i just reset it.. whats the chances that if i try to smog my truck that the light will come on????

 

Change just the purge valve solenoid on top of the intake manifold first. Most of the time that will fix the problem. I guess you could try to clean it with a little Deep Creep or something. It's not recomeneded, but if you're gonna change it anyway what the hell, right? It's a dealer only item, but I only paid about US$20.00 for it. It is easy to change so even a novice DIY'er should have no problem.

Norseman Senior Enthusiast

Norseman

Posted
Posted
anyway you can post a picture of the thing you want me to change out.

 

 

Let me see if I can find a pic of one. Let me ask another question. Do you ever have a problem fueling the truck? Ex. the pump keeps clicking off like the tank is already full.

Norseman Senior Enthusiast

Norseman

Posted
Posted
no my tank always fulls up to the top... i have a 4.3 v6 engine.. where is that purge valve located

 

 

Should be on the intake. Might be hidden under a engine cover.

jsroadside Enthusiast

jsroadside

Posted
Posted
I keep getting this code.. i tried the new gas cap and i still get it.... should i just take it to the deal and pay the gazillion dollars to fix it or are there any idea that some one could walk me through to get this fixed.. and if i just reset it.. whats the chances that if i try to smog my truck that the light will come on????

 

 

You seem to have an evap leak. Rather than throw parts at it, you may want to go to a shop( dealer or other) that has a smoke machine and could properly diag this for you.

  • 4 months later...
chopper-boyz Enthusiast

chopper-boyz

Posted
Posted

I'm getting the same code on my '03 1500 HD with 83K miles, just came on 2 weeks ago, IS there a way that I can reset the computer/light. Auto Zone checked the code for me but said that they could not reset the computer.

 

I am doing a 800 mile round trip from NH to PA this coming Sunday, should I be concerned now or can I wait until I get back to fix it??

 

Thanks

Royce in NH

Norseman Senior Enthusiast

Norseman

Posted
Posted
I'm getting the same code on my '03 1500 HD with 83K miles, just came on 2 weeks ago, IS there a way that I can reset the computer/light. Auto Zone checked the code for me but said that they could not reset the computer.

 

I am doing a 800 mile round trip from NH to PA this coming Sunday, should I be concerned now or can I wait until I get back to fix it??

 

Thanks

Royce in NH

 

 

If you are worried about damage, why would you just reset the light before the problem is fixed??

 

Just resetting the light is a waste of time. It's gonna come back on in a few hundred miles.

Tucson_02Silverado Senior Enthusiast

Tucson_02Silverado

Posted
Posted

When you replaced the cap, did you clean the lip of the neck with alcohol or acetone? Sometimes there is dirt build up there. Even something as small as a grain of sand is enough for the vapor purge sensor to think there is a system leak.

 

Do you ever try to "round-up" the pump to $ or gallons after the pump first auto-stops? If you do this habit a lot, the extra top off fuel will eventually completely saturate the charcoal canister, and it has to be replaced.

clm7214 Enthusiast

clm7214

Posted
Posted

Mine threw that code when i got it(used). I ended up taking apart the evap canister back by the fuel tank and it was full of dirt. I cleaned it all out and havent had a problem since.

Rocco715 Enthusiast

Rocco715

Posted
Posted

I had a p0442 and a p0455 (large evap leak) in my last truck and all a shop has to do is plug into the schrader valve with a smoke machine, take off the evap filter and plug that hole, then fill the system up with smoke and find out where it's comin' out at. could be a hose connected to the charcoal cannister if it's not your gas cap. as for price wise, my guy charged me $85. $60 to hook up the machine and find it and $15 for the hose.

  • 1 month later...
mattintexas04 New Member

mattintexas04

Posted
Posted

Hey guys/gals. First post here. I got this code last week. I cleaned the gas cap as well as put on a new one to see if that would clear it, both to no avail. Note that I didn't buy the new gas cap. I thought that since the cap didn't clear the code that wasn't the issue. I've had the "tighten gas cap" message before when my cap was actually loose, and tightening it solved the problem immediately. I followed Norseman's advice and bought the purge valve and installed it today. Again, to no avail, the code wasn't cleared. I went to my local Firestone where I have some work done that I don't want to do and the guy said they'd fixed two of the same recently and they replaced the rear valve on the charcoal canister. The rear valve will be $130. My feeling is that I can pay $90 for a diagnostic exam and be told that it's the rear valve, or I can just fix it and skip the exam. This is a relatively redundant system and the hoses do not have many contact points with the chassie that could cause a hole.

 

So I guess I have three questions. First, how long does it take for the code to clear? Second, has anyone had this problem after replacing the valve on the intake manifold? Third, did I make a mistake in assuming the code would clear immediately after changing the gas cap and I should go ahead and purchase the OEM from the dealer before changing the second valve?

 

Thanks

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