Detroit DD15 GHG14 (2014-16) Fault Code: SPN 904 FMI 13 (CPC) Front Axle Speed Signal is Missing

NOTE: Front axle speed signal is missing.

NOTE: If codes 168-0, 168-14, or 168-18 active fix those first.

NOTE: Cause is either CPC has improper programming or there is another computer on the vehicle (ABS, Transmission, Cab, etc…) that is causing the problems.