I have an 01 3500 HO 

i just replaced about every sensor n the truck along with the grounding mods and alternator mods. 

The truck is breaking up bad through the whole RPM range. 
it does puff white and black smoke from the exhaust. 
I just resolved an issue with my AirDog loosing ground and cutting out. 
i have the following codes. 
P0230

P0254

P0370

P1690

 

What route should i go next?

From what I found is you have a little of both the lift pump and vp. There are more informed people on here that will chime in shortly.

 

3 hours ago, Silver_O1_Dually said:

What route should i go next?

P0230 is the ECM not seeing the lift pump power draw at terminals 15 and 35, not a problem.

P0254, P0370, and P1690 are all codes for a VP44 injection pump failing.

14 minutes ago, IBMobile said:

P0230 is the ECM not seeing the lift pump power draw at terminals 15 and 35, not a problem.

P0254, P0370, and P1690 are all codes for a VP44 injection pump failing.

I was afraid of that!!

Next part is why?

 

I'm going to assume you haven't done the W-T ground wire mod. So now a bad alternator diode can pollute the system with AC noise. Being the ground for the ECM and VP44 run right next to the alternator charge line heading to the PDC. So you need to bench test the alternator replace it if noise issue is present. Then do the W-T ground wire mod which fixes this problem. Then install a new VP44 which won't be damaged by AC noise in the future.

28 minutes ago, Mopar1973Man said:

Next part is why?

 

I'm going to assume you haven't done the W-T ground wire mod. So now a bad alternator diode can pollute the system with AC noise. Being the ground for the ECM and VP44 run right next to the alternator charge line heading to the PDC. So you need to bench test the alternator replace it if noise issue is present. Then do the W-T ground wire mod which fixes this problem. Then install a new VP44 which won't be damaged by AC noise in the future.

I have done the W-T mod but have not bench tested the alternator for AC noise. I’ll check it next. 
Would i need to check a new alternator for AC noise?

If diodes are damaged either replace the diodes or just replace the alternator. Might look up local alternator rebuilder for diodes.

AC noise check ---2nd this... I remember seeing it somewhere but cant recall where. 

 

55 minutes ago, Silver_O1_Dually said:

I have done the W-T mod but have not bench tested the alternator for AC noise. I’ll check it next. 
Would i need to check a new alternator for AC noise?

1 hour ago, Silver_O1_Dually said:

Would i need to check a new alternator for AC noise?

Yes, some are bad out of the box.

 

1 hour ago, Mopar1973Man said:

If diodes are damaged either replace the diodes or just replace the alternator. Might look up local alternator rebuilder for diodes.

https://mopar1973man.com/cummins/articles.html/24-valve-2nd-generation_50/51_engine/electrical/denso-alternator-diodes-and-brush-pack-replacement-r537/?tab=comments#comment-39

Excuse the butting in but what is a W-T mod?

1 hour ago, jlwelding said:

Excuse the butting in but what is a W-T mod?

This.