Code P0449 question

Discussion in 'General Motoring' started by Oleg Lego, Jan 4, 2006.

  1. Oleg Lego

    Oleg Lego Guest

    2004 Elantra.

    Had it in to the dealer several times for a "Check Engine Light". They
    said it's a P0449 code.

    History follows:

    05/24/05 - Performed a Service Engine Scan. Found one history code
    leading to Evap system. Cleared and tested. Customer to
    monitor

    05/27/05 - Failure Code P0449
    Cause: Fuel tube hose was split allowing water into the purge
    cannister and cannister filter
    Correction: Replace hose and drain water from the cannister
    filter

    06/01/05 - Cause: Diagnostic Code P0449 Vent Valve circuit cannister
    close valve innop.
    Correction: Replaced valve

    Since that time, the Check Engine Light has been on and off quite a
    few times. The car is running fine, but I worry that the light being
    on renders it useless, as it could mask other problems that might show
    up. This whole thing started not too long after the car was rear-ended
    and repaired.

    Any ideas?

    Thanks,
    Larry (lar3ry at sasktel dot net)


    Larry
     
    Oleg Lego, Jan 4, 2006
    #1
  2. Oleg Lego

    hyundaitech Guest

    First, you should probably find out what code is present now. That'll tell
    us whether we're still combatting the same issue or something different.

    Presuming you have the P0449 again, the evap. system needs to be checked
    for fuel intrusion. Liquid fuel in the evap system can cause vacuum to
    not vent properly.

    The fuel tank pressure sensor should be checked for proper operation.

    The plumbing for the evap system should be checked for proper routing and
    connection and condition(possibly collision related).

    If you had water in the canister filter or canister itself, it's possible
    one or both of these components was damaged, especially the charcoal
    canister. Liquid in charcoal canister requires it to be replaced.
     
    hyundaitech, Jan 5, 2006
    #2
  3. Oleg Lego

    halatos2000 Guest

    It seems rather stupid on the part of the dealer to scan and obtain a
    code and take no diagnostic action other than to 'clear the code' and
    send you on your way, which is precisely what they did on your first
    visit.

    And, to add to that, P0449 is a 'generic' obd-ii code that says the
    failure is in the evap system vent solenoid. What did the dealer do on
    trip number 2? They replaced a bad hose. They still(apparently) did not
    check the electrical circuit or the physical function of the vent
    solenoid.

    On trip 3, they replaced the valve, something that should have been
    inspected and tested on visit number 1.

    If the engine light is on now, run the car down to
    checker/autozone/kragen, etc. and have them pull all of the diagnostic
    codes out for you(they will perform this service for free), and post
    your findings here.

    There are four types of OBD-II codes, if they begin with a P it is a
    powertrain code. If the first digit is a zero, P0xxx then it is a
    'generic' OBD-II code that is common to all OBD-II equipped vehicles.
    If the first digit is a 1, P1xxx, then it is a manufactureri-specific
    diagnostic code. You will need access to hyundai service literature to
    know what a P1xxx code means. However, you can read all about the
    'generic' codes here

    http://www.obdii.com/codes.html

    Let us know what you find out.

    Chris
     
    halatos2000, Jan 7, 2006
    #3
  4. Oleg Lego

    Oleg Lego Guest

    The hyundaitech entity posted thusly:
    Well, I had the car in for a Service 4 yesterday, and passed on your
    suggestions as well as those Chris mentioned.

    The following is from the bill:

    Complaint:
    Customer states that the engine check light is on
    Check history codes
    Cause:
    Scanned and inspected
    Found 2 codes dealing with the evap emissions
    p0449 and P0445
    Inspected and diagnosed that the evap cannister close
    valve not functioning as designed
    Correction:
    Removed and replaced purge cannister close valve
    assembly and cleared codes.
    Road tested for operation
    Found light did not return
    Problem corrected

    I left the dealership, and stopped at a few places in town. While on
    the way home, the light came back on. <sigh>
     
    Oleg Lego, Jan 17, 2006
    #4
  5. Oleg Lego

    Oleg Lego Guest

    Sent this a while back, but it looks like it didn't get there...


    The hyundaitech entity posted thusly:
    Well, I had the car in for a Service 4 yesterday, and passed on your
    suggestions as well as those Chris mentioned.

    The following is from the bill:

    Complaint:
    Customer states that the engine check light is on
    Check history codes
    Cause:
    Scanned and inspected
    Found 2 codes dealing with the evap emissions
    p0449 and P0445
    Inspected and diagnosed that the evap cannister close
    valve not functioning as designed
    Correction:
    Removed and replaced purge cannister close valve
    assembly and cleared codes.
    Road tested for operation
    Found light did not return
    Problem corrected

    I left the dealership, and stopped at a few places in town. While on
    the way home, the light came back on. <sigh>
     
    Oleg Lego, Feb 13, 2006
    #5
  6. Oleg Lego

    Andy C Guest

    That can be a hard one to truly clear up. I had to go back 4 times to get it
    finished... the last time I was given a loaner car for 3 days. they claimed
    it ended up being a pin hole leak in the canister system. as Its the Sulev
    engine <'05 Elantra GT hatch> The system will error on a smaller leak than
    the standard purge system. Was annoying ...but I looked up the service
    procedures in the online manual and they were doing what it says to fix
    it....It just can take a while.

    Andy C
     
    Andy C, Feb 13, 2006
    #6
  7. Oleg Lego

    Oleg Lego Guest

    The Andy C entity posted thusly:
    Thanks Andy.
    They did mention leaving the car overnight. I'll see what I can do
    about getting a loaner from them and leaving it.

    Larry
     
    Oleg Lego, Feb 14, 2006
    #7
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