Cleared PCM codes - now emissions test not ready

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 2 of 2
Northstar Engines and System Technical Discussion Discussion, Cleared PCM codes - now emissions test not ready in Cadillac Engine 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

  2. Remove Advertisements

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    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.

  4. Remove Advertisements
    Cadillac Forums

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts