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Thread: ECM choice?

  1. #1
    Tuner in Training
    Join Date
    Jan 2012
    Location
    Butler,PA
    Posts
    19

    ECM choice?

    I put a 98 Siverado 5.7 in a 97 Astro AWD with the 98 ECM hoping to unlock the 98 as it is on the support vehicle list. It won't read and when I sent the file log in the response came back as probably not a supported vehicle. I put in a 2000 Escalade ECM with the same result. I can get these older ECM's from a local Pick-A-Part all day long for $30.00@ if needed. The 97 Astro uses a TDM and it will start but dies after running several seconds so my question is does the 98 ECM needs a different signal from the TDM to keep running? If the 97 TDM won't work with the 98 can a signal be added to satisfy the 98 ECM? Can all this passkey trouble be the reason HP Tuners can't read the 98 ECM? If it is possible to unlock can the passkey be deleted like a VATS? I know this isn't a tuning question per se but surely some one on here has been through this before. Thanks.

  2. #2
    Advanced Tuner
    Join Date
    Sep 2011
    Location
    Portland, OR
    Posts
    518
    What is a TDM?
    I assume this is not an LS based engine?

  3. #3
    Tuner in Training
    Join Date
    Jan 2012
    Location
    Butler,PA
    Posts
    19
    theft deterrent module
    L31