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Thread: 2006 8.1L IAC PIDs not Valid for RAFIG/RAFPN process

  1. #1
    New Member
    Join Date
    Apr 2014

    Default 2006 8.1L IAC PIDs not Valid for RAFIG/RAFPN process

    I have a 2006 Silverado with the Allison 6 speed and A raylar 202 camshaft with long tubes and Volant. Overall pretty mild and runs great 95% of the time. I was looking to fine tune in some of the idle parameters, but bouncing the needed PIDS off of my OS shows all the ST and LT IAC PIDs as invalid. The 2 calc PIDs for RAFIG and RAFPN are valid and will log, but just rise to 3.88 in imperial or 29.36 in metric units. As such I don't believe them. I've looked around and found a few instances of this, but most were disabling of other parameters etc. I don't have anything crazy done to this tune and have uploaded the stocker as a comparison tool.

    I have attached my tune file and a data log showing what happened. Any ideas on the PIDs? I have a 2003 Suburban with the 8.1L/4l80E combo and all PIDs are valid and as expected. Thanks in advance!

    Attached Files Attached Files

  2. #2
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003


    Which PCM do you have...?

  3. #3
    New Member
    Join Date
    Apr 2014


    It tunes and scans as an LS1B, and is that style with the blue and green connectors. I've looked through threads for most of the day and it appears that the '06 OS PIDs were a little neglected since other platforms were moving onto the E38. Also EFILive won't ever let me select the A40 TCM for the allison 6 speed since it claims my PCM and that TCM weren't an option. Again, think I just own an oddball 2006 8.1L running an LS1B type PCM with an A40 TCM.

  4. #4
    Senior Member
    Join Date
    Jan 2010


    All the 8.1L Gas engines used The same PCM as the regular LS based engines. But in the HD trucks, they used an allison transmission. As such they the 5 speed used the AL5 and the 6 speed used the A40 trans controller.

    I can't comment on the 06 operating system but a friend of mine has an 03 2500HD with an 8.1 and I know he tuned both the ECU and TCM in that truck. He also did a segment swap and is running flex fuel set up.

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