'97 DeVille SES but no current codes?

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

CadillacForums.com 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, '97 DeVille SES but no current codes? in Cadillac Engine Discussion; The other day the SES came on on my '97 DeVille after hard acceleration. So I checked the codes and ...
  1. #1
    mdogg1950 is offline Cadillac Owners Member
    Automobile(s): '90 DeVille '97 DeVille
    Join Date
    Feb 2005

    '97 DeVille SES but no current codes?

    The other day the SES came on on my '97 DeVille after hard acceleration.
    So I checked the codes and it read PCM P0101 history, PZM B1971 history, and PCM?
    1) Why are there no current codes?
    2) What does PCM? mean? An option to read more codes?

    Thanks to all in advance.

    P.S. The car has 77k and runs very well with recent plugs and fuel filter.

  2. Remove Advertisements

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 65500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: '97 DeVille SES but no current codes?

    PCM stands for Powertrain Control Module. If there are no Current codes, the fault has not repeated itself for at least 3 ignition start-warmup-run-off cycles. If the fault does not repeat after 40 cycles, the code clears entirely.

    It's entirely possible that the acceleration tripped a MAF sensor flow or air/fuel mixture signal, which will set the SES. Is the light still on ?? try a few more strong accelerations and see if the light sets again. It may indicate a need for MAF or throttlebody cleaning. Also, EGR cleaning. Many, many posts on these methods. (PCM 0101 is a MAF sensor code. Clean it with TB cleaner, rags, and a toothbrush. Be VERY careful of the tiny heated resistors on the wire bridges. DO NOT dent or distort the honeycomb flow straightener.)

    In your code reading DIC sequence you may have seen a PCM ? request for module number. Sometimes the module type or serial number is mistaken for a DTC.

    Go back through the "How to pull codes" at the top of the main page and scroll through some of the various OBD-II codes to learn what the different module acronyms are.

  4. Remove Advertisements
    Cadillac Forums

+ Reply to Thread
Gear in this thread - Powered by O'Reilly Auto Parts

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)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.


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