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Thread: Can't get 8l90 to relearn

  1. 10-09-2020 #1
    Tyler Pryor
    Tyler Pryor is offline
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    Can't get 8l90 to relearn

    We are having issues with getting a 2017 GMC Denali 8l90 to relearn. The procedure is aborting almost immediatly with low voltage codes popping up. With a voltmeter at the TCM it shows 13.5 volts and with our snap on scanner it shows the same. Hp tuner software shows the same, however it won't relearn because of the codes. We did a global reset twice.

    We do the brake apply, lasts for about a minute then aborts. We do not see autofill and does say to put into any gears. It also does not increase engine throttle. No codes are in the ECM

    Any thoughts or were to look first? Thanks!
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  2. 10-09-2020 #2
    Tyler Pryor
    Tyler Pryor is offline
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    What books are recommended for these transmissons?
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  3. 10-12-2020 #3
    BDPhoto519
    BDPhoto519 is offline
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    Try starting the relearn while brake is applied and already in D.... Seems to work on some.
    2018 Camaro 2SS A8 Redline Edition
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