NEW MOTOR giving P1345 code in a 2002 TrailBlazer

This code is for "Camshaft To Crankshaft Position Correlation Fault". Maybe your rebuilt engine falls under this condition. Following are the instructions about this problem printed in my GM Shop Service Manual, Revised March 2006: If the condition started after recent internal engine repairs, inspect for proper engine mechanical timing. With the camshaft cover removed and the #1 cylinder at top dead center, make sure that the darkened chain links are lined up with the alignment marks on the exhaust and intake cam sprockets. At this point, J44221 should fit over the rear cam flats and the word Delphi (on the front of the Cam Phaser Actuator sprocket) should be parallel with the front edge of the cylinder head. Note: It may take up to 14 crankshaft revolutions before all timing alignment marks line up with each other.

Thank you I will certainly look into this matter. We fully believe it is a timing issue with the company that manufactured the engine.