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Cadillac STS Forum - 2005 through 2012 Discussion, Need help with Check Engine Light in Past Cadillac Vehicle Discussion; Check Engine light comes on and goes off by itself and sometimes it goes a week before it comes back ...
  1. #1
    tomm's Avatar
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    Need help with Check Engine Light

    Check Engine light comes on and goes off by itself and sometimes it goes a week before it comes back on for a few days before it goes back off again. Car still rides fine and I have not noticed any performance changes.

    Pulled out a scanner and I have the following 4 codes:

    P0174
    P1101
    P0068
    P0171

    Any idea where I should start? Based on some Google searches it seems to be vacuum leaks or a MAF malfunction. Also seen some threads where it said ECM needed to be reprogrammed.

    Any of you experience these codes on your N*?

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  3. #2
    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
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    Re: Need help with Check Engine Light

    I had the same problem. I checked the intake manifold bolts and they were loose. After tightening them I removed the MAF sensor, cleaned it in ethyl alcohol, rinsed it in hot water, and dryed it with a hair dryer. The problem has never returned.
    Don't mess with Binky Bear!


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    tomm's Avatar
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    Re: Need help with Check Engine Light

    Just found this thread:

    http://www.cadillacforums.com/forums...-6-v8-cel.html

    And sure enough I removed the engine cover and at least 6 bolts were loose on the manifolds that I could turn by hand. Tightened all of them and will see if it comes back before I remove the MAF. Thanks!

  5. #4
    EChas3's Avatar
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    Re: Need help with Check Engine Light

    I'm glad to hear indications are positive. Good luck!

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    Re: Need help with Check Engine Light

    Well... Light went back on for around 15 minutes and went back off by itself. Pulled the reader out and 2 codes returned:

    P1101 & P0068

    Problem only occurs when vehicle is started and its cold outside. Never have this issue in the summer so I did more reading and found this:

    Bulletin No.: 09-06-04-032A

    Date: August 06, 2009

    Subject: Check Engine Light On, DTC P1101, P0068, P0171, P0174 (Reprogram ECM)

    Models:
    2004-2006 Cadillac SRX, XLR
    2005-2006 Cadillac STS
    Equipped with Engine RPO LH2
    Please Refer to GMVIS

    Supercede:
    This bulletin is being revised to change the labor time information. Please discard Corporate Bulletin Number 09-06-04-032 (06 - Engine/Propulsion System)

    Condition

    Some customers may comment on an illuminated check engine light shortly after a cold start with no engine performance concerns. Upon inspection, DTC P1101 (Intake Air Flow System Performance) may be set. In some instances, DTCs P0068 (Throttle Body Airflow Performance), P0171 (Fuel Trim System Lean Bank 1) and/or P0174 (Fuel Trim System Lean Bank 2) may eventually set as a result of the DTC P1101.

    Correction

    Verify the condition. If the diagnostics in SI for the conditions described above do not isolate a fault, reprogram the ECM with the revised calibration that has been developed to address this condition.

    Verify that the multiple diagnostic interface (MDI) that is being used is configured to the PC that will be used.

    Warranty Information


    ((Table is not here, I couldnt copy and paste it, it says .4 hours labor.))

    For vehicles reprogrammed under the 8 year/80,000 mile (130,000 km) emission controller warranty, use the table above.

    ..

    My car only has 60k miles but since mine is a 2005 I guess this falls out of the warranty. What is this going to cost me?

  7. #6
    1BadCadSTS's Avatar
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    I would guess 80 buck. 1 hr diagnostics.

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    Re: Need help with Check Engine Light

    Mine did exactly the same thing until I cleaned the MAF. I'd try it before spending the $80.
    Don't mess with Binky Bear!


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    tomm's Avatar
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    Re: Need help with Check Engine Light

    Quote Originally Posted by dkozloski View Post
    Mine did exactly the same thing until I cleaned the MAF. I'd try it before spending the $80.
    Yeah, I think its worth a try.

    Dont have any ethyl alcohol that you used so will probably pick up a can of this stuff:

    http://www.autozone.com/autozone/acc...ier=36011_0_0_

    Unless you think the alcohol would be better?

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    Re: Need help with Check Engine Light

    Looks good to me.
    Don't mess with Binky Bear!


  11. #10
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    Re: Need help with Check Engine Light

    Ethyl alcohol = ethanol = either cheap 100 proof vodka or grain alcohol at a whiskey store.

    The ONLY reason you cannot drink 190 proof ethanol designed for gasoline additive use is that it is "denatured" - rendered unfit for human consumption - by the addition of stinky chemicals or just plain old gasoline.

    If you were to take pure ethanol from a distillery on Monday and age it for 7 years in charred oak casks you would wind up with bourbon. Take Tuesday's output and add a denaturant and you have gasoline additive. (Simplistic, but the basic premise holds true)

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    Re: Need help with Check Engine Light

    In days past, the favorite denaturing agent was wood alcohol, i.e. methanol. It causes blindness.

  13. #12
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    Re: Need help with Check Engine Light

    Cleaned the MAF, Reinstalled and codes are back after re-start. Looks like I will have to schedule a visit to the dealer for ECM reprogram.

  14. #13
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    Re: Need help with Check Engine Light

    When is the last time the throttle body was cleaned? It seems to me that the codes you have indicate a mismatch between what the MAF senses for airflow and the physical position of the throttle. At its worst, I could restart mine three time and the code would clear.
    Don't mess with Binky Bear!


  15. #14
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    Re: Need help with Check Engine Light

    I'm working in a shop and we have a 2003 STS in with a P0102 Mass Air Flow (MAF) Circuit Low Input. The boss pulled the intake off and cleaned the throttle body as well as the MAF, and it"s still throwing us the same code.

  16. #15
    dkozloski's Avatar
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    Re: Need help with Check Engine Light

    With a scan tool such as the Autoenginuity you can read out the MAF signals as well as throttle position and other data and compare it with expected outputs as outlined in the factory service manual. Otherwise you might as well be another amateur floundering around with guesswork.
    Don't mess with Binky Bear!


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