Cleared PCM codes - now emissions test not ready

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Northstar Engines and System Technical Discussion Discussion, Cleared PCM codes - now emissions test not ready in Cadillac Engine Technical Discussion; i did the onboard scan and scanned all codes and the cleared and reset all codes and they said that ...
  1. #1
    techx4965 is offline Cadillac Owners Member
    Automobile(s): 2003 deville
    Join Date
    Mar 2013

    Cleared PCM codes - now emissions test not ready

    i did the onboard scan and scanned all codes and the cleared and reset all codes and they said that this is reason odb emmison couldn't get a reading or battery unplugged i told them i cleared all and there certain codes that cant be deleted the will affect odm data? and also how do i get the emissions odb info info back in the computer asap thank you for info they said something like a drive cycle i have a 2003 deville also say if i just scan the pcm and delete a code will that delete odm info or if i delete a dss code? instead of scanning all and clearing all info

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 F150 SuperCab 4x4
    Join Date
    Feb 2006
    MD Eastern Shore

    Re: reset my computer now emmisions test not ready? help

    Any time you "clear all codes" the system will need either a dedicated GM Drive Cycle or a week or so of normal commuting during which no P emissions fault occurs in order to set the necessary "system ready" flags for the emissions test set. There's no need to ever "clear codes" - the system will automatically delete codes which do not again set after a specific number of successful start-run (not "drive") cycles.

    If your car has a permanent or recurring P emissions code it will never pass emissions testing - until you diagnose and repair the problem that sets the code(s).

    This is not the forum for normal PCM reset and car operation questions. Moved to Northstar Performance.

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