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Old 10-05-2014, 07:37 PM   #1
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Default fault codes p0101 and p0440

i guys. trouble again. my 2000 silverado 4x4 with 4.8l v8 is giving me grief. check engine light on with a p0101 and p0440 at the same time. the p0440 shows up twice on my scanner and the p0101 once. i replaced the gas cap and the purge valve and cleaned the maf with mag cleaner. deleted codes with my scanner and codes were gone for 2 tanks of gas. i filled up tonight and soon as i started the truck the check engine light came on again with same codes. any help will be appreciated. just hoping not to dump * bunch of cash into it without solving the problem. thanks
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Old 10-06-2014, 08:53 AM   #2
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the only way to see what the maf value is easily is a live data scanner compared to specs. if you have cleaned it, its likely bad.

the 440 is the broad "leak code" and there are a million things that could cause it. any leak in any part of the fuel system. the most common for those is the vent valve though because from the factory put right where it can fill up with junk and get stuck open. that causes a leak code. there are a number of valve relocation kits available, i used the one from napa when i did my old mans, it comes with a valve that uses some rubber hose and you buy some extra hose and put it somewhere else. some put it above the trans, i just put it high in the fender where the salt doesnt go.
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Old 10-06-2014, 08:58 PM   #3
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ya thats what i figured on the Maf sensor so i ordered a new one today. i was just thinking maybe there was some reason they both came on at the same time but just coincidence i guess
i think i will order a new vent valve kit for the canister i see they have upgrade ones that let you move it to a more desirable spot so i will try that and keep you posted. thanks
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Old 10-07-2014, 08:26 AM   #4
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like i said could be a million things. take it out and text it with a car battery you should be able to blow through one way and not with voltage applied it the other way around.
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Old 11-11-2014, 05:42 PM   #5
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ok so i finally got it fixed. it was a combo of the vent valve and the filler neck tube , which was rotten on the inner side of the box. replaced both and its good to go. thanks for all the help. it definitely lead me in the right direction.
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Old 11-12-2014, 07:57 AM   #6
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Thanks for posting your fix
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