2002 dodge diesel throwing codes left and right need help pcu codes are 1682 0622 0320 1694 1693 ecu codes 1693 1698 02321690 03410230 plus gas guage and tach going crazy please help going crazy tryin to fix
Just looking at the codes, I would guess you have a charging system problem and it may have taken out your ECM plus you have a low transfer pump pressure that could have taken out the VP44. So you have plenty of issues I would take it by a good repair shop and get a estimate.
Now it could be as simple as cleaning the battery post and the grounding point where the ground connects to the block and body, I say this because one of the codes is the voltage.
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