P0234 -- Engine boost condition – limit exceeded Hose connection(s), wiring, TC regulating valve
See Section 11, pg. 9 in the 2005 FSM | Not a lot of detailed information in the FSM
A mechanical boost pressure gauge can be of great help in tying to diagnose a boost pressure related problem.
Quote:
TURBOCHARGER SYSTEM
DIAGNOSIS AND TESTING TURBOCHARGER BOOST PRESSURE
Several Diagnostic Trouble Codes (DTCs) can be set that will indicate high or low system boost levels.
There is a DTC for circuit faults relating to the electronically controlled wastegate command valve.
(Refer to 11 - EXHAUST SYSTEM/TURBOCHARGER SYSTEM/CHARGE AIR COOLER AND PLUMBING - DIAGNOSIS AND TESTING)
for diagnosing of low or high boost pressure due to leaks.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
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