[Graphic Man]

here is the codes for that

P1688
Internal Fuel Injection Pump Controller Failure

P1689
No Communication Between ECM & Injection Pump Module


I'd start checking all grounds and connections.....it may be a bad VP

 

[Graphic Man]

sounds like you have a bad pump....for $1200 they did not replace everything in the pump...they only fixed what was broken.....from what i was told the cost on parts to rebuild a complete VP44 (top to bottom) is more then $1200