Those are codes for a egr solenoid but 2500 and 3500 trucks are non egr..im wondering if ur vaccum system is malfunctioning? id test your vaccum pump..google how to check it its located on pass side beneath ac compressor

 

Got mine back from the mechanic-----bad ingnition switch----op had already been by-passed. The new LP was defective....warranty...Trans was speed senser(has 2 on the transmission-was able to reach from outside) checked/one had fluid in the conector..Replaced.....so now the steering wheel