tccm relearn???

Discussion in 'Transfer Cases' started by rob_z71, Jan 6, 2017.

  1. rob_z71

    rob_z71 Newbie

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    is there a relearn procedure for after installing a new tccm? ive been having trouble with my 4wd and finally figured out that i think its the tccm. the old module would go into 4lo but not 4hi. i got a new one from rockauto and plugged it in and now the 2hi or 4wd buttons wont even light up at all. truck is a 1998 gmc k1500 with an np1 transfer case. any insight would be greatly appreciated. thanks
     
  2. Brandon Brownlee

    Brandon Brownlee Newbie

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    On this video the guy references resetting the tccm



    Ignition on... off for 5 seconds... repeat a bunch. Not sure if it works but this guy seems pretty confident.
     

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