Help with Check engine light and pcm codes!!
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Northstar Engines and System Technical Discussion Discussion, Help with Check engine light and pcm codes!! in Cadillac Engine Technical Discussion; Well recently my "check engine soon" light came on so I decided to pull the codes. I came up with ...
  1. #1
    CaddieDeville is offline Cadillac Owners Member
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    Help with Check engine light and pcm codes!!

    Well recently my "check engine soon" light came on so I decided to pull the codes. I came up with a few, they are as follows:
    History PCM P0603
    History PCM P0741
    History PCM P1520

    I would like to know what the codes mean and how I can resolve them. And If theirs something I am missing please inform me of them. I have a 99' Deville with 70,000 miles thnx!

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    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
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    Re: Help with Check engine light and pcm codes!!

    Quote Originally Posted by CaddieDeville View Post
    Well recently my "check engine soon" light came on so I decided to pull the codes. I came up with a few, they are as follows:
    History PCM P0603
    History PCM P0741
    History PCM P1520

    I would like to know what the codes mean and how I can resolve them. And If theirs something I am missing please inform me of them. I have a 99' Deville with 70,000 miles thnx!
    http://www.obdii.com/codes.asp

    Look'em up.

  4. #3
    CaddieDeville is offline Cadillac Owners Member
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    Re: Help with Check engine light and pcm codes!!

    Well I've figured out what the codes were nothing to worry about except for P1520- Transmission Range Switch Circuit, Can anyone explain what this means and how I can fix it?>??

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Help with Check engine light and pcm codes!!

    I am not sure what that one is, but since it is historical, clear it and see if it returns.

  6. #5
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: Help with Check engine light and pcm codes!!

    The transmission range switch is the little black box sitting on your tranny shift arm. I don't think it's a problem not having one operating properly, because inside the transmission is another set of switches as a backup. However, if those fail you'll start to drop out of gears, which isn't fun

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