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Thread: E40 computer OS swap?

  1. #1
    New Member
    Join Date
    Jan 2016

    Default E40 computer OS swap?

    I'm doing a v8 swap with in a Colorado. I need to run an E40 computer to do it. I got a computer from the local junk yard but it's from a grandprix v6. Can I do a full write and put a trailblazer v8 OS on it? Also, is there a difference in the t42 TCM's? I also got it from a grandprix.
    I've been searching for days with no real answer. Service number is 12581501

  2. #2
    Lifetime Member
    Join Date
    Mar 2006


    E40 was never used with any V6s to my knowledge. Can you confirm it's a real E40 and says E40 on the ECM case? I searched for that service number and it came up with an 04 Grand Prix...the E40 was only used from 05-06 with 5.3/6.0L V8s as a stop gap between the 1MB LSB1 PCM and the E38/E67s.

    If it's a real E40, you might be able to do a full write with a GM Tech II, but as this is a Gen IV ECM (E40) it will require SPS to program the ETC/DBW controller. No aftermarket tuning product can do this as it is a write-only controller.
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    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
    Forum tyhee Site Admin GMPX's Avatar
    Join Date
    Apr 2003


    I'm guessing it is a P05....looks just like an E40. As Erik said, look at the bottom of the case, you'll see 'E40' or 'P05' stamped in the aluminium cover.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.

  4. #4
    Senior Member
    Join Date
    Feb 2009


    gonna be a P12, you will need a E40, to do this, you will need Tis or sps to flash it to a 06 SSR or 06 trailblazer. The interchange on Hollander has bee wrong for years now they ay the v6 computer works but it doesn't, the E40 has E40 cast into the case. Send me a PM for more help

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