Engine P1639 Engine Code?

Discussion in 'SN95 4.6L Mustang Tech' started by scottyp, Jan 14, 2014.

  1. So I just bought me a 2001 Mustang Gt and it came up with a P1639 Engine code. Does anyone know what this mean? Thanks
     
  2. vehicle id block is not programmed or corrupt.... pcm failure
     
  3. is there a tuner or chip plugged in to the ecm?