Eaton autoshift will not go into any gears no error code, just flashes

If there are no codes and it just flashes the gear icon, it usually means it's waiting for the input shaft speed to slow down enough before it engages a gear, which tends to mean there is some mechanical issue with the clutch or inertia brake (if equipped).

 

I’ve got a ‘20 T680 that’ll randomly go into neutral at stop signs and lights. Tells me the trans needs serviced. I hit the 4-ways, turn off the ignition, and hope it’s cleared when I restart the truck. So far, I’ve gotten lucky and it works. And, other motorists haven’t shot me, yet. The good times of electronic transmissions.

 

DM clutch. Likely dragging with a broken spring and the inertia brake cannot overcome the drag. I agree, most likely clutch.

 

As long as you’ve done all that, pull the flooring back where the shift tower would have been, check if the floor has a ‘knock out’. If so, go to a scrap yard and get a complete shift tower, and all the linkage for a conventional clutch pedal that fits your transmission, and your model/year, then unbolt all that auto-shift bull crap that sits on top of the tranny, knock that plate out of the floor, reinstall a shift tower. And be on your way, never to be bothered by the ‘flashing kiss of death’ from a bull crap auto shift transmission again.

 

I have 2013 freightliner m2 autoshift that have a delay to go in gear whenever it gets hot and I stop and ready to move but if it's able to roll it will go in gear