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Thread: The dreaded 03 lb7 ecm crash! Ross Cindy?

  1. #1
    Junior Member
    Join Date
    Sep 2007

    Default The dreaded 03 lb7 ecm crash! Ross Cindy?

    Well I was trying to help a friend by loading a tow tune in his 03 lb7. After getting the ECM Locked prompt multiple times when trying to download his stock file I was finally able to get it to download. Knowing the history of these bastard corrupt ecm's after being reflashed by the dealer i was kind of skeptical of moving foward with tuning his truck, but did so any way. So I went ahead and married the liscense to his vin and started uploading the tow tune. 5K Megabytes into the upload it locked up on me saying it was trying to reconnect to the ecm. After 3 hours of letting it try to reconnect I gave up. I tried to load the tune in again, and all I get is Bootloader rejected. Truck won't start/turn over. I figured the Pass Lock/VATS was causing this, so I tried to relearn that. No worky.

    I have another 03 ecm, and was wondering if I use a Tech 2 can I load the proper tune in it by using his VIN? I know I'll have to marry the ecm to the bcm using the VATS relearn.
    2004 GMC CC D-Max
    EFI,Tranny,and a couple other goodies.

  2. #2
    Lifetime Member Dmaxink's Avatar
    Join Date
    Nov 2009


    Have you tried to FULL FLASH the stock file back in? This is done by the SECOND red arrow next to the "cal flash" (first) red arrow...

    I'm out of ideas? Nah trick... When in doubt, 0xFFFF it out!

  3. #3
    Junior Member
    Join Date
    Sep 2007


    Oh yeah. I get the big red square. BOOTLOADER REJECTED. I'm going to pull his ecm and put it in my truck and try to load it again. He has an aftermarket Satelite radio in his. I pulled all the fuses but was told that if it has an inline harness that pulling fuses won't work.
    2004 GMC CC D-Max
    EFI,Tranny,and a couple other goodies.

  4. #4
    Lifetime Member killerbee's Avatar
    Join Date
    Jan 2006


    Batteries getting low?

    I have your ECM's in stock if you need another.
    Last edited by killerbee; April 25th, 2011 at 03:43 PM.
    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. #5
    EFILive Developer Site Admin Blacky's Avatar
    Join Date
    Mar 2003


    Make sure you're using the latest software available here:
    I recommend saving the *.tun file as a *.ctd file using the EFILive V7.5 Tune Tool software, then use the V8 EFILive Scan And Tune software to flash the controller. The V8 flash routines are better than the V7.5 flash routines.

    Before asking for help, please read this.

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