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Thread: Failed reflash trailblazer colorado il6 -- avoid by pulling fuses

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  1. #1
    Join Date
    Apr 2007

    Default Failed reflash trailblazer colorado il6 -- avoid by pulling fuses

    UPDATE--Anyone having failed re-flashes on Trailbazers, Colorados or any
    IL6 application where the re-flash stops about 1/3 of the way and then locks up--Car then won't start and is completly dead
    I had had a friend with a TECH II read the ECM and it says to unplug the following fuses:
    Under the rear drivers seat fuse box--- # 6 and # 51--
    #6 is for the brake light and # 51 says LGM/DSM ( don't know what that actually is)
    Unlike most GM applications where the radio---amp---accessory--- Bose---aux. or Info fuses are pulled----Have no idea why #6 and #51 are correct but must have some hidden reason why it interupts communication
    YES--flash worked and tune successfully downloaded !!! 99.99% the ECM is not fried and the tune can be re-covered---
    Last edited by joecar; December 21st, 2010 at 09:30 AM.

  2. #2
    Lifetime Member
    Join Date
    Mar 2006


    LGM = liftgate module, I just replaced mine on my 02 P10 and am going to try and flash my stock PCM again. Never had an issue until the LGM went out, fought it for 2 weeks and just got everything fixed. Will report back.

    Works now that the LGM is replaced and working, flashing just fine with V8. Still having a weird issue with V7.5 and BBF, going to report on it now.
    Last edited by ScarabEpic22; December 21st, 2010 at 11:56 AM.
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  3. #3
    Lifetime Member GMPX's Avatar
    Join Date
    Apr 2003


    Some of GM's platforms really made a mess of the VPW module behaviour. Sometimes pulling fuses is the only option (as stated on GM's TIS website).
    I no longer monitor the forum, please either post your question or create a support ticket.

  4. #4
    Lifetime Member HellKnightHicks's Avatar
    Join Date
    Mar 2011


    I6 p12 Envoys have issues as well.

    Ill try pulling those fuses and see if it helps with my issue.

    I attempted a flash it failed.

    I tried to do a full flash as recommended in another thread and it also failed.

    Just says retrying previous block.

    Then PCM in unknown state.

    Ill try popppin those fuses and see if it doesnt help me with my issue.

  5. #5
    Lifetime Member HellKnightHicks's Avatar
    Join Date
    Mar 2011


    Fixed it.. Ill document how i recovered it shortly

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