Question about 2000 Chevrolet Blazer

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'96 Chevy Blazer Service Engin Soon codes P0440 P0700 P1100

I broke down about 2 weeks ago. When I took it in for services I was told I have 79 codes. They replaced by Ignition Switch and the fuel pump. Car is now running, however I keep getting a SES light. I clear the codes, but they keep come back. I know the P0440 is a gas cap so I replace that just in case. I even took it back to the shop and had them check the hoses around my fuel tank. I also had them remove a Auto Start system that was install on the SUV several years back, but did work. They though it might have been shorting out or getting volts from the computer.

Any thoughts on what the issue might be????

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  • Anonymous Jan 19, 2009

    Also check the valve top side of tank towards the front. Evap (roll over) valve

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If you are throwing 79 codes it is probably a computer issue.need to clear and see what comes back up. 440 is not a leak but a malfunction check purge solenoid

Posted on Dec 17, 2008

  • TripleTauto
    TripleTauto Dec 18, 2008

    all 79 codes come back??

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PO440


http://www.obd-codes.com/p0442
P0440 indicates the failure of the EVAP system to develop proper vacuum. If you got
and replaced a proper good quality gas cap, you have corrected the most common cause.
However, in fully searching the causes of this code (http://engine-codes.com/p0440_chevrolet.html ) (pardon the generic GM info, but will apply for you)-----you will find there are 5 other causes of the vacuum failure, which are independent of the gas cap. Your good local mechanic can sort those out; I would save your gas cap
receipt if you were advised to buy one not needed. As you probably know, your
State emission test facility checks your gas cap----so that is another way to find that specific portion of this answer,
(for their fee).
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helpful = 2001 Deville intermittent service engine soon light code P0300
co-logo-100x100.png 2001 Deville intermittent service engine soon light code... I recently bought this car from an owner who took decent care of it but a week after i bought it, the service engine light appeared. After a few View on www.cadillacforums... Preview by Yahoo You will see that this generic code is perhaps more serious, costly, and harder
to track down than the P0440. You will also discover that P0301 is cylinder 1 misfire, P0302 is cylinder 2, and etc, etc. If you get a good diagnostic, they will generally
be able to localize the problem fairly specifically---and get a more specific fix. The person who reported this code was unhappy because he was given several ($$) fixes,
before he got one that erased the code, and was a solution. (Be forewarned ----A generic misfire can have umpteen issues--or one! !; use your own local preferred method for solving this with a mechanic who gives you good service, and stands behind what they do.)
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