Originally Posted by blue99stroker
who knows could be p1211 or possibly p0603.
hard to tell.
p1211 is injection pressure above/below desired. so hpop not keeping up.
the p0603 is just overboost.
are you running stock tuning?
No im running a dp tuner with custom tunes. My truck has stage 1 single shots, RR fuel system, ported compressor housing, intake and exhaust. I dont think it would be over boosting cuz it comes on in both low boost and high boost situations. Do I need to find a better scanner to check for codes again?