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+--- Thread: 2018 t680 with automated eaton 10 speed (/showthread.php?tid=10560)
2018 t680 with automated eaton 10 speed - mromgcorey - 04-01-2026
SPN 788 FMI 7
SPN 560 FMI 11
I was switching trailers one day, the lower gears seemed to be grabbing really hard and when I put it in Neutral, the truck shut off and wouldn't turn on until I pulled the fuse for the trans. These are the codes I was getting.
I drove another 300 miles and it did it again when I put it in N but was able to turn back over. Everything seems to be working okay but the faults stay.
The only other issues I've had is a SPN 752 FMI 2 when it rains really hard. Then the truck won't shift anymore until it dries off and then it starts working again. Code disappears.
I took it to a shop and they said the clutch was broken and something about the spring...
I've been told there is still clutch left from another mechanic and I don't see how the clutch could be broken.
What do you guys suggest?
RE: 2018 t680 with automated eaton 10 speed - tree98 - 04-02-2026
I don't know anything about these auto trans but I would say your issue with the rain is something electrical. You might be dealing with more than 1 issue here.
RE: 2018 t680 with automated eaton 10 speed - marek4792 - 04-02-2026
I'd find out which wire and connector(s) it runs to, make sure the pins are clean and in all the way. Then check if you don't have a break in a wire which FMI 2 usually means with intermittent connections. All you may need is a 50 cent heat shink crimp and 15 minutes of your time..