allison 5 speed won't go into 5th gear

Discussion in 'Class A / Diesel Pushers' started by fixit, Jun 2, 2010.

  1. fixit

    fixit Junior Member

    i have a 05 monaco and my check trans light comes on and when it does my trans will notupshift up to 5th gear. i have had the tcm and the ecm checked. the ecm says im ok but the tcm says when iwant to upshift i am asking the engine to slow down a little and the tcm gets no response? so the tcm won't shift to 5th. gear
    Go figure?
    Any clues?
  2. dbarton291

    dbarton291 Senior Member

    RE: allison 5 speed won't go into 5th gear

    What's the diagnostic code list in the TCM read out? If you had it checked out, that's the first thing the technician should tell you.

Share This Page