OK - last comment on the codes. P2287 sure makes it look like the ICP sensor or the wiring is bad.
Now - if you have tried disconnecting the ICP sensor in the troubleshooting process, then that might be the cause of this code.
Have you been trying to start with the sensor disconnected?
It is not uncommon for the ICP sensor and the pigtail to fail on the early model year (yours) 6.0L engines.
IMO the rest of the codes are not of any great importance right now.
I try to give more information than may be needed so I do not inadvertently leave something out.
I have not tried disconnecting the ICP sensor. I did not want to do anything until someone could enlighten me on what the issue(s) could be and what the next step is.
I will try that and get back to report when I have a chance to disconnect it. It may be tomorrow when I can do it.
When it was running I know the turbo would kick in but it was slow to pick up and go. Perhaps it is having an issue.
The injector #1 may be wiring as all 8 injectors were replaced at a local Diesel shop about 3 or 4 years ago. It was the failure if the #1 injector that caused the replacement. It totally went out and the truck was smoking like crazy. Had it towed to the shop and found another 4 that were on thier way out so I ended up having all 8 done.
I am not familiar with testing for the oil pressure, but the cost of replacing the oil pump scares me. The truck does not leak oil and does not use oil. I did notice in the past couple months that it was slightly blowing black smoke, when it never used to. The only time I noticed it before was under load like towing my 5th wheel and climbing a hill into higher altitudes.
In June and July we took the truck and trailer to Oregon and Yellowstone then back home to Nevada. The truck performed wonderfully and did not have one occurance that I can say may have led up to this.
I did have the blue spring kit delivered just now and wonder if I should do that while unplugging the ICP sensor? Is this even a factor?
I will get back with the hope that it is the ICP.
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