2009 volvo vnl670 fault code help please

I have a 2009 Volvo VNL670 with a Cummings engine that is throwing engine faults. I have only had the truck for about a month. I'm hoping that they are some easy fixes. Or at the very least nothing serious.

The last 8 of the VIN: 9N279060

#1..
ENGINE ECU
Boost pressure
Value too low
Active
Number of events: 3
MID 128 PID 102 PMI 1

#2..
CLIMATE UNIT
SAE J1708/J1587
data link
Communication error
Inactive
Number of events: 55
MID 146 SID 250 PMI 9

That is what shows on the idiot screen under diagnostics. I clear them and they come back a short time later.
Any help on this matter would be greatly appreciated. If you need any more info please let me know.
Thank you in advance!!!
Michelle

 

Do you know where I would start looking for the connections/loose pins? I'm not totally stupid I know how to do minor repairs. However a little nudge in the right direction, as far as where to start looking, would be appreciated.

Thanks Again.

 

I will have to get up there and check because I do have the Qualcomm cable but no Qualcomm. There is no way of getting rid of corrosion in a wire except for replacing it. As in this case correct?

 

The company I am leasing too is talking about requiring a Qualcomm. Wouldn't that be a really bad idea too cut the cable or cost me even more to have it installed later??