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Thread: 24x Conversion 0411 PCM "Detect Protocol Failed"

  1. #1
    Potential Tuner
    Join Date
    Nov 2019
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    3

    24x Conversion 0411 PCM "Detect Protocol Failed"

    Hello,
    New user here. I just completed the Torqhead 24x 0411 pcm Conversion and I got a mail order tune from Keith at PCMforLess.
    He did my previous mail order tune for my set up which is a 1997 Camaro LT1 383, LE Cam (236/242), Kooks LT and it was ok.
    Well I sent my pcm off to PCMforless and car starts up and runs ok. So I bought HP Tuners mpvi2 Pro so that I could do some
    wideband tuning (buying at a later date). I go to connect to the car and I get "Detect Protocol Failed". I tried resyncing and
    connecting again but it didn't work. I wondered if there was a problem with HP so I go to my other car (2001 Pontiac Firehawk)
    and it connects with no problem and I can download the tune in it. I then go back to my 24x conversion car and still get the
    "Detect Protocol Failed" error. I checked for power on the OBDII port (#16) and I have power.
    I spoke with Keith at PCMforLess and he said that he doesn't believe that I have a VIN in the computer as he uses TunerCats
    and it isn't necessary. He also thinks that disabling VATS could be part of the problem. We talked about sending back my pcm
    and having him install the VIN.
    I just have a couple questions before I send my pcm off:
    1.) If my mail order tune flash does not have a VIN, will this keep HP Tuners from connecting?
    2.) Will putting in the VIN from my car work or will it have to be the VIN from a LS vehicle with the correct OS?
    3.) If I am able to get the VIN from my car installed, will HP be able to connect and allow me to edit and flash?
    I opened a ticket with HP to get this looked at and I know that it will take a while before they can help.
    I am just looking for insight from others that have done the swap.
    Thanks.

  2. #2
    HP Tuners Support
    (foff667)
    Bill@HPTuners's Avatar
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    Try reading via bench harness to rule out a wiring issue of some sort, otherwise it could be anything from wiring to a pin on the ecm causing the issue.
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  3. #3
    Potential Tuner
    Join Date
    Nov 2019
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    Thanks for the response. I have a Torqhead 0411 pcm that has the LT1 OBDII connections. Do you know where I can find a bench harness for this pcm? I haven't found any that were still being made.

  4. #4
    Tuner in Training
    Join Date
    Jul 2018
    Posts
    22
    here is one on ebay or you can make one for under 10 bucks

    https://www.ebay.com/i/153581406463?...xoCQFUQAvD_BwE

  5. #5
    Potential Tuner
    Join Date
    Nov 2019
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    3
    Thanks but that is for an LS computer. I have the Torqhead pcm that uses the LT harness for the pcm.