2015 Freightliner casscadia spn 639 fault 7 (NO ENG)

Turn key on everything comes on after 3-5 seconds ( NO ENG ) displayed on dash. You can try to start it and the starter clicks but every 4th time you try the starter engages enough to bump the fan a couple inches. SPN is 639 from the display.

Checked all fuse in glove box.
Checked fuse in box on fire wall and fuses in the other box that has ignitions fuse and relay. All have 12v
You can jump the starter turns like crazy but wont turn on. Runner to the starter get 12v for a second then 0.
Changed solenoid on starter, had a lose bolt that wiggled.

Only thing I see is DEF tank lights up all green then goes to 1 bar then yellow then flashing red. Not sure this would cause it to not start, we did put 2 gallons of def in so it does have some but still shows empty.

Anything Im missing here??

 

The owner was there checking fuses with the key on, Im thinking that code popped up when he pulled the ignition fuse and put it back in everything on the engine turned of then came back on. Ill tell him to add more def see if that gives a reading on the gauge

 

I checked the harness into the the sensor and only show 3volts (Im guessing its min 5) checked the connector on the frame and it only shows 3volts (was thinking bad wire) that wire goes into a ecm right next to the def tank (this is a friends trucks I have all 2000 and older) def gauge in truck flashes red trying to look for a schematic for the ecm to see what its doing but no luck on finding that yet

 

checked fuse everything was good power all the way into the cab told owner to drop it off at freightliner I was looking at it because he was a friend so free of charge but this needs a computer to hook up too which I dont have