GMC Troubleshooting Questions? Ask a Mechanic for Answers
You can drive the truck with these codes present. The first one has to do with an intake air sensor for the DPF regeneration, the second one has to do with EGR, and the third has to do with a glow plug. Truck will start and run normally, you won't have any DPF regeneration while they are current, but that won't affect you driving the truck on vacation.
Did you get this worked out? Wanted to follow up and make sure you got what you needed from me.
Please remember to rate my answers, that's how I get compensated.