2012 Cascadia DD15 fault codes list

Thank you so much

 

SYS 68 is the Grade sensor illogical grade.
SYS 63 is the XY shifter gear motor not functioning properly.
There are steps in the manual that can be done without computer software.
Here is the service manual link.
https://faculty.mccneb.edu/dgilliland/DESL2120/rrUS110831trts0930.pdf

 

SPN 773 is the same as sys 63, but SPN 773 should be followed with a FMI number. That would give a more specific fault code for the actual problem.

 

That’s the weird part nothing follows no FMI number

 

May need code reader / laptop software to read it.

 

It’s been 9 days and spent over 6k all the part the mention like xy shifter harness and sensors where replaced. We still have the flashing F

 

On top of that when the hook to the computer doesn’t show anything the whole system hides computer can’t read

 

Code reader is not even connecting to the computer to do the diagnostic to read codes it’s showing NOTHING help please could this be a fuse

 

If laptop can't connect to TCM (transmission control module) then the most probable issues in the order of most to least are (1) blown power or ground fuse in battery box. TCM gets power and ground straight from battery posts.(2) while checking fuses, look for broken/corroded connectors on the wires usually right at the posts (3) follow said wiring from battery box to TCM checking for corrosion or breaks. (4) defective TCM. Steps 1-3 can be done with a flashlight,cutters for zip ties and 9/16 wrench for battery post lugs. Step 4 needs pro help.

 

bad central gateway also can cause non communication issues.