my HOLD light recently came onn then it went off then it came on again and so on.it would not sift at all or in a limp mode.i was told it was a speed senser,sift soleniod.ect. the fluid was reading full on the dipstick. i knew it couldnt be a major prob when the light was off it shifted perfectly.anyway for some reson i decide to put more trany fluid in and man was i happy when that light was off.my addvice to anyone with this problem is to add a hlf quart trany fluid first.