P2149 -Where is it and how do i check it

Question

2006 Dodge Ram2500 5.9commings

Answer 1

P2149 Bank 2 (cylinder 4-6) Shorted high or Low

This condition will give you a rough idle being a code defintion has shorted high means disconnection at the harness which is very common.Many times a high resistance  connection is made correct simply by disconnecting and reconnecting you may want to try this which is the best scenerio other than replacing the valve conver gasket of injector 4-6. (you need to clear the code then restart) Shorted low is very uncommon the reason is that cylinder 5 would be affected. More than likely the solution is connector which part of the valve cover gasket.