Went into limp or safe mode checked for codes P2149 has me worried ! on 2006 Dodge Ram 3500

Journeyman 557e801cd4784d8ff835b38f3ce0382fce2b6648a740d3c63b0eb4abb5a716fb
Changed the fuel filter noticed crud at base of housing so i drained diesel and used a scotch pad to remove the scale! Also used towels to lift the noticeable dirt etc. reset the computer and turned off CEL check engine light and erased codes!
First trial run was ok however im not sure if i fixed the problem as it also mentioned that Group B injectors may have an open circuit on the supply side?
Is the supply side the "high" side? Can i check it without taking off the valve cover? Again it was a P2149 code
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