03 avalanch put it on scanner because 3rd and 4th r missing when going down the road

Discussion in 'GM Powertrain' started by jimbean, Sep 30, 2012.

  1. jimbean

    jimbean New Member

    drained tranny pan and changed tranny filter, it looked like alot of metal
    03 avalanch put it on scanner because 3rd and 4th r missing when going down the road it wont engage unless you get the truck up to high revs and high speed {feels like slipping}

    it comes up with mass airflow sensor codes
    on a genisys otc scanner
    1 of the of the fast trac repair fix statements on genisys scanner , says the mass airflow sensor could make it slip in 3rd and 4th because its not getting the engine revs
    {motor will peak with pedal held down}

    any suggestions besides bringing to the shop {i work on vehicles}
    all fuse`s seemed to be good ,the 1`s that have power with key on
     
  2. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

    I think they are completely separate issues, especially as you have metal in the tranny drain. The tranny problems could be tricking the PCM into thinking there is a problem with the MAF

    However, go ahead and fix the MAF and see if that cures the tranny problem.
     

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