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Old 07-28-2008
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Check Engine Light

Ok so my check engine light came on today, got it pulled at Autozone and it was P0442 which is the gas cap. But it wouldn't let him clear the code and it took him like 10 tries to get it to read. I don't know if something is up with my computer since the BL or what. Any one have any ideas, I have both battery cables unhooked right now to see if that will do anything, the gas cap was kinda loose so that might have been it.
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Old 07-28-2008
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Trent, it could be as simple as replacing the gas cap or you may have a hole in your EVAP system. Either try what your doing by unhooking the battery or you may need a new gas cap, Make sure the one you have now is on correctly.

Or it could be you have a hole in your fuel vapor lines going to the charcoal canister. Try the cheap options first...gas cap etc.
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Old 07-28-2008
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I wonder if it could it be the filler hose that you had mess with? or did you even have to mess with it?
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Old 07-28-2008
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I wonder if it could it be the filler hose that you had mess with? or did you even have to mess with it?
Thats what I'm thinking. Thats not my problem though I'm worried about the codes not clearing through the code reader.
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Old 07-28-2008
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the codes having not cleared could be you have a hole in a line somewhere in your EVAP system. Thats my guess.
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Old 07-28-2008
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Ok so I just started it back up after having the battery cables off for 30 min and no code so far, hopefully it won't come back. I'm going to put the filler extension on tonight, I don't need it but it can't hurt.
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Old 07-28-2008
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Originally Posted by Plyswthsqurles View Post
the codes having not cleared could be you have a hole in a line somewhere in your EVAP system. Thats my guess.
The code should have cleared no matter what, it would have came back on if the problem wasn't fixed. I hope it was a problem with his code reader, not my truck.
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Old 07-28-2008
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Good luck with the filler hose. That thing was a pain.
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Old 07-28-2008
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i dont know how you got it to work without extending the lines, my guess is they are pinched off from being so tight, no air flow, then code.

i wouldnt worry about clearing the code, some code readers are crappy.
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Old 07-28-2008
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i dont know how you got it to work without extending the lines, my guess is they are pinched off from being so tight, no air flow, then code.

i wouldnt worry about clearing the code, some code readers are crappy.
I looked and it was just like stock, no pinching or anything. I'm gonna extend it anyway, better safe then sorry. I know 2-3 guys that didn't have to extend theres and its been working fine for over a year.
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Old 07-28-2008
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Trent, next time you want to reset your PCM, you don't have to wait 30 minutes. If you turn on your headlights, then remove the negative battery terminal, it will reset in a matter of seconds. The headlights provide a current path to discharge the filter capacitors on the unswitched 12V line in the PCM.
You can also touch the negative battery cable you remove from the negative battery terminal, and touch it to the positive battery terminal, and it do the same thing.

I remember you saying you had your bed off lately, the fuel filler tube could be causing your CEL.
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Old 07-28-2008
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Originally Posted by Takeda View Post
Trent, next time you want to reset your PCM, you don't have to wait 30 minutes. If you turn on your headlights, then remove the negative battery terminal, it will reset in a matter of seconds. The headlights provide a current path to discharge the filter capacitors on the unswitched 12V line in the PCM.
You can also touch the negative battery cable you remove from the negative battery terminal, and touch it to the positive battery terminal, and it do the same thing.

I remember you saying you had your bed off lately, the fuel filler tube could be causing your CEL.
Oh I know it doesn't take that long, I just unhooked it and went inside and did some work and came back out. I'll see if the code comes back on after I put the extension in tonight. Thanks for yalls help
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Old 07-28-2008
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Oh I know it doesn't take that long, I just unhooked it and went inside and did some work and came back out. I'll see if the code comes back on after I put the extension in tonight. Thanks for yalls help
If you just unhook the battery, it does take awhile, because there is no current path to discharge the filter capacitors, other than leakage current in the PCM.
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Old 07-28-2008
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Thats good to know now, I remember hearing something about being able to touch the negative to the positive and that would do it but didn't know if that worked for our trucks too. Learn something new every day!
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Old 07-28-2008
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Quote:
Originally Posted by 04blackedge View Post
I looked and it was just like stock, no pinching or anything. I'm gonna extend it anyway, better safe then sorry. I know 2-3 guys that didn't have to extend theres and its been working fine for over a year.
withe regular or flareside beds? i know its fine on a flareside but on a regular bed idk how you got it to work properly.
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Old 07-28-2008
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withe regular or flareside beds? i know its fine on a flareside but on a regular bed idk how you got it to work properly.
Mine's flareside and I had to extend it. It was close but still wasn't long enough.
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Old 07-28-2008
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I never had to extend mine. We didn't extend my roommates either. Mines been fine for close to 2 years now and his has been about a year.
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Old 07-28-2008
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withe regular or flareside beds? i know its fine on a flareside but on a regular bed idk how you got it to work properly.
They were all regular.
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