EEC61, FAULT1/2/3, DAUG 3, code 2892

I have the amber engine light on with msg EEC61 fault 1, fault 2, and 3; DAUG 3 -and 2892.
Truck drivers fine- except when I’m climbing wee hills on I-91 CT I get the check engine light-

I checked all DEF control module- disconnected cleaned and reconnected all wires/hoses. I disconnect battery terminal waited an hour and reconnected -
It’s still the same-no change
Any help is appreciated