My son's 1999 ram 1500 magnum truck will start and run but when u drive it ..it will just shut off no power then when u stop the no buss code will show ...shut it off it will restart drive again then the same just shuts off..then no buss code

 

You have a problem on the 5volt sensor feed circuit. Need to figger out which sensor is the problem.... trouble is, could be any of them.