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Thread: New to site...Which ecm to use?

  1. 02-09-2013 #1
    Veenz
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    New to site...Which ecm to use?

    Hello, new to this site, currently have HP Pro on its way. I have a 49 chev truck currently installing a LQ9 6.0L, comp cam, headers, holley Hi ram with DBC throttle body, wide band O2, 4l80E 2wd. Engine is from 05 Escalade. I have the stock harness and ecm. I will be converting harnness to DBC. I have spent countless hours reading posts and for some reason still unclear as to which ecm to use. I have a friend that owns a wrecking yard so I have access to just about any ecm needed.

    The ecm that came with engine is #12589463 which from what i read will not accept DBC. Any help would be appreciated as to which ecm would be best for my application. I would like the proper ecm for DBC and the closest factory tune for my application to start with, then tune from there.
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  2. 02-09-2013 #2
    Lextech
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    You could use the 12586243 (2004) or the 12589462 (2005) or the 12602801 (2007) PCMs. They have the IAC drivers for DBC. I can't seem to find a listing for a 2006 DBC PCM.

    Jeff
    98 GMC Twin Turbo 5.0, 4L80e, Moser 60, 4:10s,
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  3. 02-10-2013 #3
    1969x11
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    Get one from a 2002 silverado (411) pcm.
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  4. 02-10-2013 #4
    Lextech
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    Quote Originally Posted by 1969x11 View Post
    Get one from a 2002 silverado (411) pcm.
    You could definitely do that. You would need to change the Green plastics on one of the 80 pin PCM connectors to Red plastics. I think you would also need to give the O2 heater circuit a ground and/or delete the heater codes in the tune----I can't remember which.

    Jeff
    98 GMC Twin Turbo 5.0, 4L80e, Moser 60, 4:10s,
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  5. 02-10-2013 #5
    Shrek
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    Lots of good options being discussed ...

    The 2005 wiring harness is configured for Isolate Ground O2 sensors - all 4 of them. A 2002 LQ4 6.0L tune (used the 12200411 PCM) is setup for Isolate Ground upstream O2s - some used 4 Isolate Ground O2s.

    My 2 cents ... use the existing wiring harness (easily converted from 4L60 to 4L80 use) and the existing PCM - and a DBW throttle body. Easy to install, and Cruise Control ready.
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  6. 02-12-2013 #6
    PitchblackC3
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    IF you are dead set on using DBC there are 2003 model PCMs that allow you to use DBC while retaining the BLUE/GREEN PCM.
    From LT1SWAP.COM
    "2003: Serv. No. 12576106 with Hwd. No. 12570558 - Pretty much all 2003 stuff should have this PCM.

    2004: Serv. No. 12586243 with Hwd. No. 12583659 - Mostly GTO and Express vans got this PCM, as well as Caddy CTS-V. MIGHT be in trucks.

    2005-2006: Serv. No. 12589462 with Hwd. No. 12589161 - I think you'll only find this in Express Vans. Maybe in some pickups, not for sure."
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