this is what the verus says for code p0046..... alot of typing....
"position of the turbocharger vanes is controlled by the ECM. ECM utilizes a turbo vane control solenoid and a turbo vane position sensor to control the turbo vanes. when engine is not under load, the turbo vanes are in an open position, or no boost condition. when engine is under load, the ECM commands the Control solenoid valve to close the trubo vanes. thus increasing the boost. ECM will vary the boost dependant upon the load requirements of the engine. the Vane control solenoid control valve uses 2 circuits, a control circuit and a low reference circuit. ECM uses a pulse width modulation on the control circuit to open and control the solenoid valve.
if any service has been performed on the turbocharger or on the turbocharger components, a turbocharger relearn must be performed. failure to perform relearn may cause this DTC to set."
mine my fingers are tired. lol
'04.5 2500 HD Ext Cab LT
1/4 million+ mile mark
19 mpg @ 65mph
*LBZ MP installed 21 mpg @ 65mph
*MBRP 4" turbo back exhaust