Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: LMM "Trailer Brake System Service" message after DSP OS flash.

  1. #1
    Senior Member
    Join Date
    Jun 2011
    Posts
    115

    Default LMM "Trailer Brake System Service" message after DSP OS flash.

    I have tuned 2 LMM trucks recently that have thrown this message after a full flash to a custom DSP OS. I have the one truck scheduled to come back on 7/5/12 so I can check it out. Any help or insite on the matter would be greatly appreciated. Is this coincidence? Are other having this issue?

    I have not yet tried reverting to the non DSP OS to see if the issue resolves but that will be one of the first things I plan to try.

  2. #2
    Lifetime Member GMC-2002-Dmax's Avatar
    Join Date
    Dec 2005
    Posts
    1,294

    Default

    did you use the stock tune file when you made the DSP5 script ???
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  3. #3
    Lifetime Member Dmaxink's Avatar
    Join Date
    Nov 2009
    Posts
    1,176

    Default

    If you put a tire size of over 34" in...it will trigger this.

  4. #4
    Senior Member
    Join Date
    Jun 2011
    Posts
    115

    Default

    Quote Originally Posted by GMC-2002-Dmax View Post
    did you use the stock tune file when you made the DSP5 script ???
    Initially yes. Then I switched OS to see if that made a difference, non.
    Quote Originally Posted by Dmaxink View Post
    If you put a tire size of over 34" in...it will trigger this.
    Ok. The one coming in has the tire size set near 30". He running 225/75/R17 tires. I was messing with it last evening right before I made this post.

    This truck had an H&S tuner on it before I tuned it. Would a clean flash from the dealer possibly fix it?

    The other truck has 33-34" tires but was a stock OS before it lost exhaust and got tuned...unless a previous owner had messed with it, doubtful though.

  5. #5
    Lifetime Member GMC-2002-Dmax's Avatar
    Join Date
    Dec 2005
    Posts
    1,294

    Default

    Pm me the VIN# only and I'll see if I have a stock-unmolested file I can send over
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  6. #6
    Senior Member
    Join Date
    Jun 2011
    Posts
    115

    Default

    PM sent.

  7. #7
    Senior Member
    Join Date
    Jun 2011
    Posts
    115

    Default

    Any new ideas on this? The guy want to tow his 5er next week and no trailer brakes makes it impossible!

  8. #8
    Lifetime Member
    Join Date
    Feb 2007
    Posts
    517

    Default

    What have you tried so far? Have you set all the speedometer parameters back to stock or installed the stock tune or at least the stock OS?

  9. #9
    Lifetime Member GMC-2002-Dmax's Avatar
    Join Date
    Dec 2005
    Posts
    1,294

    Default

    Vin # you PM'd me comes up an invalid on GM-TIS
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  10. #10
    Senior Member
    Join Date
    Jun 2011
    Posts
    115

    Default

    GMC-2002-Dmax sent me a clean OS with the proper segments for the truck and I built the tune off that and it still pops the message. Then I hooked up a Snap-on Modis and checked the EBCM (electronic brake control module) data and it told me the trailer brake system is still disabled. I guess the only option at this time is to visit the dealer.

    The other truck that left with this same message on the dash, fixed it's self. I talked to the owner over the weekend and he tells me the message disappeared and the trailer brakes work fine.

    Thanks for the help!

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 256
    Last Post: December 7th, 2016, 07:39 AM
  2. EFILive "Classic"/"Legacy"/"Historic"?
    By emarkay in forum FlashScan V2
    Replies: 6
    Last Post: November 2nd, 2008, 01:48 AM
  3. "Service Airbag" message :(
    By scdyne in forum Petrol / Gas
    Replies: 3
    Last Post: May 4th, 2008, 12:08 PM
  4. Replies: 3
    Last Post: July 20th, 2006, 09:19 AM
  5. "Service Brake System" message after tune change
    By mtnman in forum General (Petrol, Gas, Ethanol)
    Replies: 0
    Last Post: September 11th, 2005, 01:26 AM

Posting Permissions

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