I am leaving Dec 5 from Upstate NY and pulling a 3500lb boat all the way to Phoenix AZ. I have been working on the Jeep (05 CRD) to get ready. So far I have put new front bearings, Euro converter, new tires, new brakes, new turbo hoses, checked all other hoses, changed oil& filters. I will take along an extra fuel filter, lots of tools, extra wheel bearings for the trailer. I am still getting the P0299 code and can't figure out why, I have checked everything I can check, but the jeep runs great so I put a piece of tape over the light and.....its gone in my mind (yes I have a small mind).
Any other suggestions for the trip?

I would check the sensor on the front of the air box. The little one. I had the same code and found that unplugged. I now have a zip tie and tape around it.

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05 liberty Sport Black CRD,GDE trans tune, Stant 13519 thermostat , Samco Hoses, Weathertech mats, segr, K &N filter ,2nd gen fuel head, 2.5 inches lift, JBA A-arms, Roof rack,
99 Camaro Silver LS1 heads, loud mouth, fast as hell and just as fun!!!
It was stock when I got it but now It's mine!!
You only love it if you change it!!

It could also be bad wiring somewhere. I believe thats my issue as my MAF shows no data when I try to read from the ECU and the pressure sensor doesnt either.

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs

Two possibilities to check:
Could you have a Charge Air Cooler (intercooler) leak causing the low boost pressure. Some have found a crack in the plastic end tank causing a leak and fixed the crack with JB Weld or similar product.
Possible problem with the turbo vanes boost controller or maybe a hole in the plastic tube that runs from the boost control solenoid over to the turbo vane control diaphragm.
Can be tested with a simple hand held vacuum pump like a MightyVac.

I remember reading on here about one person who found a small hole or crack in that plastic pipe where it runs under the coolant reservoir and it was inside a protective cover... It uses vacuum to control the turbo vanes and if there is a leak the turbo vanes will not open up enought to produce full boost pressure...

Let us know what you find....

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve