A question on diagnostic codes

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Northstar Engines and System Technical Discussion Discussion, A question on diagnostic codes in Cadillac Engine Discussion; My car has been having trouble starting up when cold. I decided to pull the codes and came up with ...
  1. #1
    Wicho is offline Cadillac Owners Fanatic
    Join Date
    Jan 2004
    Miami, Florida

    A question on diagnostic codes

    My car has been having trouble starting up when cold. I decided to pull the codes and came up with a few.

    PCM P0139 History
    PCM P0603 History
    ACM B1312 Current
    SPM B1147 History
    PZM B1983 History

    My question is this. Do the "History" codes mean that the car has already had that problem fixed or is it that that problem has not been fixed ? I had the FPR fixed when I bought the car so I don't think it may be that. What can it be now ? I don't take it out much or for that matter start it until lately. Could the battery have lost charge during the 2-4 weeks I rarely used it ? Thanks and sorry for all the questions

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  3. #2
    MWA is offline Cadillac Owners Fanatic
    Automobile(s): 07 Black Raven CTS, 07 Gold Mist CTS
    Join Date
    Feb 2004

    Re: A question on diagnostic codes

    They occur enough to go into history. Current are just that...more important. Have you cleared them and waited to see what returns? I have a lumbar sensor in history that always returns, but it is not that important to me to bug it out yet. The fuel sensor problem that was current was repaired at a dealer just this week and once the problem is repaired and then "cleared" it does not return. Haukap's link, which appears on several threads on the forum is probably the best for explanation of DTC's. Here it is:

    OBD II- http://myweb.accessus.net/~090/dtcobd2.html

    Good luck.....

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: A question on diagnostic codes

    A code is current when the fault is detected. If the fault is no longer detected it will remain current for three ignition cycles, then go to history where it will remain if not detected again for fifty ingnition cycles at which point it will be cleared.

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