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Thread: Vehicle does not start while vats set to "none"

  1. #1

    Vehicle does not start while vats set to "none"

    I Swapped a 5.3 lm7 into my 2000 tahoe z71 obs, i cranked it and it started right up and shut off, i used the hptuners to set the vats setting to "none" then clicked "write entire" and security light turned off and now truck wont start, i did this about 5 times and still wont start, i set the vats to serial again then it starts right up and security light starts flashing again. Any advice? been at this for the past three days

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    Vats disable only requires a write calibration only on those computers. That should be all that is required to turn it off. You can check for other DTC's related to the anti theft system and set them to no error reported.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.