98 century "active fault 1&2" will not start

[kwkevin]

my 1998 Freightliner century all of a sudden shows "active fault 1&2" it will turn over but will not start. I am not sure what to do.

 

[pop]

dont know code 1&2 . need to know the engine it has.

 

[kwkevin]

It has the detroit 60 series and eaton 10 spd.

 

[bigyellowpete]

Make sure your battery cables are tight.

Most engine fault codes are 2 digit. If it is really fault code 12, it means the VSG input sensor voltage is high.