Yes ... so after installing the belt i pulled the viscous relay from the box. Not long after that (about 3km) the ETC lamp came up. I pulled over turned the key off and then back on and it went away. I then plugged in my DTC reader and only thing it found was thermostat temp too low ... i guess that kindof makes sense now that i disabled the viscous heater(thinking it might of not been a good idea without removing the fan as well). Odd thing is after about a 20 minute ride the check engine light was on and i hooked up the code reader again and its giving me this High speed CAN comunication bus performance code.

Any ideas ?

Do these codes have numbers that we can lookup and verify?

Reason is, Im not aware of any thermostat temp code. And if there was, it would be a very common code for every CRD owner.
So I suspect your code scanner is mis-interpreting these codes.

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U.S. Army Retired

Read this article at OBD-codes.com, it gives a fairly good synopsis of the issue:> https://www.obd-codes.com/u0001

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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

The readers often don't tell you the correct code information. As stated above, it's best to take the code number and go look it up in the P-code thread in the CRD tech section

I know I had a bad glow plug a few months back and torque pro was telling me it was something totally different

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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