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Thread: New PCM, A/C won't work and it's 104!

  1. #1
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    Default New PCM, A/C won't work and it's 104!

    I replaced my PCM with a salvage unit, and now my air conditioner won't work. I can activate the the scan tool and run it with the command button on the diagnostics. I thought I saw a thread on here that dealt with this, but I can't find it for the life of me and its 104 degrees out.
    Last edited by puddlestomper; June 28th, 2013 at 01:11 AM. Reason: exceptionally poor spelling.

  2. #2
    Lifetime Member THEFERMANATOR's Avatar
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    Sounds like your ECM(LB7's don't have a PCM) has the wrong operating system loaded in it. This is a common issue when you mix and match tunes, and is why you must use the stock base file for your truck.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  3. #3
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    Default Re: New PCM, A/C won't work and it's 104!

    I have no stock base file. My computer was locked when I bought it. Had it unlocked and they had to change the OS. And it came back damaged.

  4. #4
    Lifetime Member killerbee's Avatar
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    If you are needing a new ECM, we can supply one with your stock file.
    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
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    Default Re: New PCM, A/C won't work and it's 104!

    I actually considered you and was about to call. Your prices were very appealing. However, a local salvage yard I go to frequently gave me one for $200 with a warranty.

  6. #6
    Lifetime Member killerbee's Avatar
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    Glad you got it worked out!!
    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"

  7. #7
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    Default Re: New PCM, A/C won't work and it's 104!

    Sort of. Still no a/c. When I get a new license so I can tune this ecm, is there any way to program the a/c to work properly? Or do I need to search for the proper OS?

  8. #8
    Lifetime Member THEFERMANATOR's Avatar
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    You need to find the correct OS for YOUR truck to go into the replacement ECM. Some guys can take your VIN and send you the base file, you could go to GM and have it flashed to get it, OR you could go to the TIS site and find what segments you need and then find a matching tune online.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  9. #9
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    Default Re: New PCM, A/C won't work and it's 104!

    I've got it. Found a program with the right OS. Unfortunately it's a 215 hp tune.

  10. #10
    Lifetime Member GMC-2002-Dmax's Avatar
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    PM me your VIN# and email and I will supply you with the correct stock tune
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


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