Question about 2003 Chevrolet Impala

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Check engine light/code 440?

I have a check engine light that comes on intermittently (seems to be warmer weather or when I use A/C). Had it finally checked. Autozone said it was code 440? Some sort of vacuum-related issue. They said to try replacing the gas cap (which I did - got one from the dealer). Light stayed on, so I had it reset. Came back on a day later. Other option was vacuum related - they said take it to a garage. Could it be a simple hose replacement? Or filter?

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  • Mike Parent
    Mike Parent Sep 15, 2008

    I didn't see any loose or disconnected lines. It does idle rough on rare occasion. It also seems to have a bit of a "fish bite" when accelerating. The car has 110k on it

  • Mike Parent
    Mike Parent Sep 19, 2008

    I changed the MAP sensor a little while ago. The check engine light did not go off. Do I need to have it reset? It has gone off by itself in the past (only to rear its ugly head). The car seems to be idling a bit different/rougher, but it could be the cheap gas I put in it today.

  • Anonymous Oct 12, 2008

    I had the same problem its in evap system its probably a crack vacuum lineor defective pcv valve

  • Anonymous Nov 29, 2008

    Same problem. The dealer recommended me a garage that fixed it within minutes but it came back soon after.

  • Anonymous Mar 17, 2014

    i reset engie light and it will stay off for about 2 days.seems to come back on when the weather starts getting warmer.code p1441 comes up when engine light comes on I have replaced the vent scensor already.could this be the purge valve scencor .is this a common problem for 96 jimmy 4.3 engine?

  • Anonymous Mar 23, 2014

    what all could cause this code and where is the system located



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You should look on the right side of the engine(closest to the firewall) for any loose or disconnected vaccum lines on your intake,throttle body or you evap system. I do have a question? does the vehicle idle rough or does it hesitate on acceleration?

Posted on Sep 15, 2008

  • Ronald Mueller
    Ronald Mueller Sep 15, 2008

    that sounds like you might have a faulty mpa sernsor(manifold pressure sensor also known as barometric switch) this would explain a loss of vaccum like symptom and a intermitant idle. this would throw a vaccum code.; p-lease rate this

  • Ronald Mueller
    Ronald Mueller Sep 19, 2008

    if your having a rough idle it could be that your TPS(throttle position sensor) is the fault. it could also be the O2 sensor as well, because the O2, TPS,map, and maf all work in conjunction they all are fuel related in that the ECM(engine control module) receives the signals from them and adjusts according to the return signal. have you found any loose are disconnected vaccum lines yet?as far as the light you should have it reset,however if there is an active code the light will come back on. to do a good diagnosis of the electronic system a full scan should be done. this involves more than just a code reader. with a scan tool at a shop you can check the ecm for any faults and reset them you can also change the paraqmeters to give the vehicle better performance.



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