Check egine ligt on / service emmisson
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Check egine ligt on / service emmisson in Past Cadillac Vehicle Discussion; Got damn this car, just got my altenator replaced a week ago now another service light comes on....Yesterday I'm driving ...
  1. #1
    c62nt62 is offline Cadillac Owners Member
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    Check egine ligt on / service emmisson

    Got damn this car, just got my altenator replaced a week ago now another service light comes on....Yesterday I'm driving and the check engine light comes on and message says check emmisson, anybody know what this means?

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    SL1CK's Avatar
    SL1CK is offline Cadillac Owners Enthusiast
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    Re: Check egine ligt on / service emmisson

    What model and year car do you have?

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    Ranger's Avatar
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    Re: Check egine ligt on / service emmisson

    You have to pull the DTC's to find out what is causing the message.

  5. #4
    Playdrv4me's Avatar
    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: Check egine ligt on / service emmisson

    It would be helpful to know what car it is first of all, but... Check emmissions system could be anything from EGR to Catalyst! We need codes to help figure out whats wrong.

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    c62nt62 is offline Cadillac Owners Member
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    Re: Check egine ligt on / service emmisson

    1996 cadillac sts, I think it may be the EGR vavle, because I also notice that I am getting really bad gas mileage too.

  7. #6
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    mikeay is offline Cadillac Owners Fanatic
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    Re: Check egine ligt on / service emmisson

    On my 96, the air filter box has a sensor located on it, check to make sure it's pluged in.
    When I change my air filter I sometimes forget to plug that back in, it results in the check emmissons message.

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    c62nt62 is offline Cadillac Owners Member
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    Re: Check egine ligt on / service emmisson

    ok I am trying to pull the codes but, I see the "info" button, buT i DON'T SEE THE WARMER BUTTON?????

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    Ranger's Avatar
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    Re: Check egine ligt on / service emmisson

    Use the INFO UP & OFF buttons or OFF & PASSENGER WARMER (which ever configuration you have).

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    c62nt62 is offline Cadillac Owners Member
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    Re: Check egine ligt on / service emmisson

    car is sucking gas like crazy, I think I'm getting like 12mpg, I am still trying to get the codes but can't locate the buttons people are telling me to look for, I am going to take a pic of my dash and post it!

  11. #10
    SL1CK's Avatar
    SL1CK is offline Cadillac Owners Enthusiast
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    Re: Check egine ligt on / service emmisson

    I'll help, when I had that problem, I had to clena my EGR valve and cleaned the throttle body while I was at it. I'll post a pic...be right back...

    [Edit]

    Ok back...I have the exact same car, 1996 Cadillac Seville STS...so follow these instructions...

    First, attain codes by pressing the OFF and Pass WARMER buttons at the same time...these:


    Then, the codes will show up on the Information Display...make sure you have pen and paper handy!...here:


    If the problem is what we thought it was (EGR Valve)...then clean it...it is located here:


    For specific instructions on how to clean the EGR valve, type in EGR valve in the search function and click on the thread that say "How to Clean the EGR Vavle" "(in the Technical discussion forum)

  12. #11
    c62nt62 is offline Cadillac Owners Member
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    Re: Check egine ligt on / service emmisson

    thanks.....here are the codes PC0420, PC0603, TC0073

  13. #12
    c62nt62 is offline Cadillac Owners Member
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    Re: Check egine ligt on / service emmisson

    Anybody know what these mean??

    P0420 - Catalyst System Low Efficiency
    P0603 - Control Module Long Term Memory ReseT
    DTC 73 - Driver Side Impact Sensor Short to Voltage

  14. #13
    SL1CK's Avatar
    SL1CK is offline Cadillac Owners Enthusiast
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    Re: Check egine ligt on / service emmisson

    Quote Originally Posted by Playdrv4me
    It would be helpful to know what car it is first of all, but... Check emmissions system could be anything from EGR to Catalyst! We need codes to help figure out whats wrong.
    Quote Originally Posted by c62nt62
    P0420 - Catalyst System Low Efficiency
    Well, there's your emissions problem. What the hell it means.....I don't know.

  15. #14
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    Re: Check egine ligt on / service emmisson

    If your "sucking gas like crazy", first check the FPR. Very easy to do. Explanation in the Tech Tips section.

  16. #15
    breedmn is offline Cadillac Owners Member
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    Re: Check egine ligt on / service emmisson

    you can also clear the codes from that need you must. let the codes finish. when prompt PCM? push the high fan. (High fan=yes, low fan=no. it will read the code again and shortly after prompt PCM clear codes? high fan and it will clear.

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