On-board codes
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, On-board codes in Past Cadillac Vehicle Discussion; Hi all, and thanks for the warm welcome when I came aboard back in april. Sorry I haven't been here ...
  1. #1
    Angela Desmond is offline Cadillac Owners Fanatic
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    On-board codes

    Hi all, and thanks for the warm welcome when I came aboard back in april. Sorry I haven't been here for awhile. I have a '95 Sedan Deville and the tech books from Helm Inc. to help me along figuring out the codes from the on-board diagnostics but I can't find in the book how to clear the codes. I have some codes marked history which I know got in there when a mechanic hooked up his diagnostics to the system. I'd like to clear them out to see if they reappear but I just can't seem to find this in the books.. I also just had the service engine soon light come on and I traced it through the on-board to the code P085 which is the throttle plate angle out of whack usually due to carbon built up on the throttle plates. I cleaned the plates and it lowered the display value to 1.3, which is well within the limits of the check, so I'd like to clear that out also. Can anyone out there help me with this??? Thanks if you can...

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  3. #2
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
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    From the "PCM?" prompt:

    1. Press "HI"
    2. At "PCM DATA?" prompt, press "LO" and continue pressing "LO" at each prompt until the prompt is "PCM CLEAR CODES?" then press "HI"
    It should then signal "PCM CODES CLEAR"

    That's it, you're done.

  4. #3
    Angela Desmond is offline Cadillac Owners Fanatic
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    new windsor new york
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    Thanks.. Believe it or not, about an hour before your reply I was messing with it and found that out by shear luck, but it's good you told me that anyway 'cause it insured me that I did it right. I took the car in yesterday for a mechanic to check out the "service ride control"message on the board and he ended up disabling my traction control and the ABS system. I'm afraid to screw with this computerized stuff otherwise I would try to tackle it myself. I did get to the bottom of the "service engine soon " message by going into PCM and finding the fault code to be the throttle plate angle to be off, probably due to carbon deposits. I tried to clean the plates and the value in that particular code went down closer to what the book says it should be but it's still a little high and the fault is still there, so is the "service engine soon" message. I guess I have to clean it a little better.. Ah for the days of 425's with a simple Quadrajet....

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