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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2001 Deville Gas Cap Light in Past Cadillac Vehicle Discussion; Hey guys I am having the same issue, i replaced the gas cap and cleared the codes. For a couple ...
  1. #16
    Berat is offline Cadillac Owners Member
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    Re: 2001 Cadillac Deville Gas Cap Light

    Hey guys I am having the same issue, i replaced the gas cap and cleared the codes. For a couple of days it was fine, but the msg appeared again. I read earlier in the forum that it might be more complicated to take care of this issue, so what should be my next step. I cant seem to find the recall for 2001, however i did see the recall for the 02+ models.


  2. #17
    codewize's Avatar
    codewize is offline Cadillac Owners Master
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    Re: 2001 Cadillac Deville Gas Cap Light

    All I got was an SES light and then looked at the code, whatever it was. That's how I knew.

    No message about gas caps

    Quote Originally Posted by Ranger View Post
    It's there. It will appear as a message on the bottom of the DIC when and if the conditions occur.

  3. #18
    Berat is offline Cadillac Owners Member
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    Re: 2001 Cadillac Deville Gas Cap Light

    The code I got when the "check gas cap" msg came in was P0440 which was the EVAP system or whatever. If this was recalled shouldn't they fix this?

  4. #19
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    Re: 2001 Cadillac Deville Gas Cap Light

    It depends on what the problem is. The EVAP system includes much more than just the tank pressure sensor. If you are getting a P0440 code, you have to check out the entire system and find the problem. Most likely a leak somewhere.

  5. #20
    codewize's Avatar
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    Re: 2001 Cadillac Deville Gas Cap Light

    That's the code I got but no message, just an SES light. After reading that it indicated a possible leak in the EVAP system I remembered the gas cap being a possible culprit. I took it off and put it back on making sure it was tight. All has been well ever since.

  6. #21
    DIS DTS is offline Cadillac Owners Fanatic
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    Re: 2001 Cadillac Deville Gas Cap Light

    My 03 DTS has the code P0440 and the gas cap message. Cap seems fine. Is the recall mentioned in effect for the 03? Could this be related to code
    P0463? This code is for the fuel level sensor. My gas gauge jumps around after about a 1/4 of tank. I also had P0507 and P1106. I cleaned the TB cleared the codes and drove 400 miles in two days and those 2 codes didn't reset yet.

  7. #22
    danb_1 is offline Cadillac Owners Member
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    Re: 2001 Cadillac Deville Gas Cap Light

    How can you reset the code if the check gas cap light comes on? To see if there is still a problem after cleaning, etc.

  8. #23
    basscatt's Avatar
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    Re: 2001 Cadillac Deville Gas Cap Light

    Quote Originally Posted by danb_1 View Post
    How can you reset the code if the check gas cap light comes on? To see if there is still a problem after cleaning, etc.
    --------------------------------
    are you getting a CODE - as in DTC -

    or are you getting a MESSAGE on the DIC -

    if it is the MESSAGE - you don't/can't reset it -
    when you FIX the problem - the MESSAGE will go away -

    ---------------------
    if you have checked the cap - and it is clean and tight -

    my guess is that your gas filler neck is rusting out -
    and you have tiny pinholes in it -

    if that IS the case - the only solution is to replace the filler neck -

  9. #24
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    Re: 2001 Deville Gas Cap Light

    So what is to be done about this problem . The Message comes and goes on my 03 deville ...

  10. #25
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    Re: 2001 Deville Gas Cap Light

    Please read the entire thread. The procedures for reading trouble codes and diagnosing the EVAP system are all in here.

  11. #26
    jdogg69 is offline Cadillac Owners Member
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    Re: 2001 Cadillac Deville Gas Cap Light

    Quote Originally Posted by Mark58 View Post
    Yes there is a light "Check gas cap" on my 2001 DHS
    replaced cap same problem,,
    Check for rust on the fuel neck where your gas cap goes. Cleaned mine and put a light coat of grease so it seals and BINGO no more problems for months.
    Yup on mine their was one small hole that I stopped with JB Weld and then after a day coated pipe with layer of grease, ck gas cap light went out.

  12. #27
    ot1
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    Re: 2001 Deville Gas Cap Light

    I have the Gas Cap message on my 02 STS. Just to let anyone else know, you can reset the message and MIL with a scanner. If the problem is not corrected the DIC message will show up again BUT only after 5 or so driving cycles because the EVAP test is put on hold. Your scanner will say EVAP Not Ready until the test is performed and if you take your car to a Emissions Testing facility right after you reset the EVAP code P0440, their test will return EVAP Not Ready and your vehicle will fail.
    My gas cap had a cracked seal but replacing it didn't fix the problem, it was only $13 for the original part from RockAuto...so now onward... I will post what fixed the problem when I have it corrected.

  13. #28
    Submariner409's Avatar
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    Re: 2001 Deville Gas Cap Light

    You can also eliminate the message and clear the associated trouble code by using the car's built-in scanner/reader system.

    When the vehicle starts and runs for a period of time the entire diagnostic system performs hundreds of checks. If the EVAP problem occurs again, the diagnostic codes sets and the message comes on again - until you diagnose and repair the real problem.

    Many codes affect the emissions "ready" flags - one or more EVAP system problems is only the tip of the iceberg.

  14. #29
    basscatt's Avatar
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    Re: 2001 Deville Gas Cap Light

    Quote Originally Posted by ot1 View Post
    I have the Gas Cap message on my 02 STS. Just to let anyone else know, you can reset the message and MIL with a scanner. If the problem is not corrected the DIC message will show up again BUT only after 5 or so driving cycles because the EVAP test is put on hold. Your scanner will say EVAP Not Ready until the test is performed and if you take your car to a Emissions Testing facility right after you reset the EVAP code P0440, their test will return EVAP Not Ready and your vehicle will fail.
    My gas cap had a cracked seal but replacing it didn't fix the problem, it was only $13 for the original part from RockAuto...so now onward... I will post what fixed the problem when I have it corrected.
    ============================
    you can reset the message and MIL with a scanner
    you don't need a separate scanner to clear codes -
    the on-board unit will do it -
    and once the code is cleared - the DIC message will be gone -

    of course - both the code and the message will simply come back until the actual problem is fixed -

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