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View Full Version : 4L80E No Shift problem



BillCarry
06-07-2014, 13:38
1994 P-30. 6.5 TD Motor Home.

Randomly the trans will not shift after a start. I'm not sure if it is first or second gear (second is default I believe). After shutting down and restarting all is ok. It stores codes 74 and 85. Has done this twice in the past few days. I just checked the codes and they are not there. I did replace the input speed sensor as a stab in the dark and I think the codes were in there before that, but I might be confused. Sorry for the not so clear description. Just thought that this might be a condition that someone has run into.

Bill Carry

BillCarry
07-21-2014, 13:46
Replaced the ignition switch and problem went away.