Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18

Thread: 2004 lly PCM locked

  1. #11
    Lifetime Member THEFERMANATOR's Avatar
    Join Date
    Mar 2009
    Posts
    790

    Default

    Starting in the late 90's, GM started incorporating the door chime and other warning chimes into the radio, and used the speakers for the chime instead of a seperate warning module. For trucks it hit in 03, so an adapter goes inline between the stock radio plug, and the aftermarket radio. Also the 03+ radios have no power feed wire to them, but instead use a signal from the class 2 data bus to turn off and on, so the adapter also turns the radio off and on. The problem with the adapter is, it doesn't listen to GM data bus messages when the scan/flash tool tells everything on the databus to go quiet so it can communicate with a specific module while the others go dormant while the quiet signal is being sent. So if it doesn't go dormant during the quiet signal, then the scan/flash tool cannot communicate, and many times will think the module is locked when in reality it cannot communicate because the databus is being occupied by a rogue module(the aftermarket one that doesn't listen).
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  2. #12
    Junior Member
    Join Date
    Jan 2015
    Posts
    16

    Default

    Ok that's for the info I'll give it a try but my efi live tunner guy said there was a key lock on it so he could not get into it what a key lock come up if it was not coumnacation

  3. #13
    Lifetime Member THEFERMANATOR's Avatar
    Join Date
    Mar 2009
    Posts
    790

    Default

    It can, the LLY I did last week came up with it 1 time I tried to read it out with the radio adapter in place.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  4. #14
    Lifetime Member killerbee's Avatar
    Join Date
    Jan 2006
    Posts
    1,044

    Default

    Quote Originally Posted by bman View Post
    Ok that's for the info I'll give it a try but my efi live tunner guy said there was a key lock on it so he could not get into it what a key lock come up if it was not coumnacation
    If you like we can diagnose/flash it for you on the bench. Will flash any file you want to provide. That is with the assumption that it is accessible, and not locked out. Just another option.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

  5. #15
    New Member
    Join Date
    Dec 2014
    Posts
    1

    Default

    I had the same thing THEFERMANATOR had with my 05. It was the aftermarket door chime module for an aftermarket radio. Once unplugged, it worked fine.

  6. #16
    Diesel Forum Support Site Admin
    Join Date
    Nov 2005
    Posts
    1,716

    Default

    Quote Originally Posted by bman View Post
    Ok that's for the info I'll give it a try but my efi live tunner guy said there was a key lock on it so he could not get into it what a key lock come up if it was not coumnacation
    Typically the error you got is what your tuner described and also what I described earlier in this thread.

    Effectively, a couple of users have given you additional information that they are suggesting that that same message is generated when another condition maybe present. Until your tuner attempts their suggestions, it's speculation if the controller is actually locked.

    Cheers
    Cindy

  7. #17
    Junior Member
    Join Date
    Jan 2015
    Posts
    16

    Default

    That's all for the help I will be posting on Wednesday if it work or not

  8. #18
    Lifetime Member THEFERMANATOR's Avatar
    Join Date
    Mar 2009
    Posts
    790

    Default

    Also make sure that teh box for try alt keys is checked. The LLY came back tonight for a reflash and to install the DSP5 switch, and even with the radio adapter unplugged, it gave me a ECM locked with custom seed key message with the V8 tune tool. Went back to V7 and checked the try alt keys box and the flash went through. I know for a fact teh ECM is not locked with a custom key, and I have had to do this on LLY's before to get them to flash. I'm really growing to hate LLY's, but they seem to be what people keep bringing me lately.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

Page 2 of 2 FirstFirst 12

Similar Threads

  1. 2004.5 LLY Stock Tune File Needed
    By BigTexas68 in forum Duramax LLY
    Replies: 12
    Last Post: May 20th, 2013, 02:23 AM
  2. 2004.5 LLY can I use 2006 LLY tunes?
    By Badass_chris in forum Duramax LLY
    Replies: 4
    Last Post: October 22nd, 2012, 03:16 AM
  3. 2004.5 LLY EGR Block???'s
    By GAMEOVER in forum Duramax LLY
    Replies: 8
    Last Post: February 20th, 2011, 10:38 AM
  4. 2004.5 LLY limping trans?
    By Mr.Blister007 in forum Duramax LLY
    Replies: 2
    Last Post: September 1st, 2010, 11:34 AM
  5. 2004 LLY Dual alternators
    By s10mods in forum Duramax LLY
    Replies: 2
    Last Post: March 29th, 2009, 12:45 PM

Posting Permissions

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