2002 Chevy Trailblazer check engine light

Has this vehicle ever had a cylinderhead replacement or cam phaser replacement? Because this code normally sets when an internal repair is done like any timing chain removal, the P1345 will keep setting if the timing chain was set a tooth off, if no internal repairs were done then replace the cam phaser actuator sprocket. Also remove and check the cam phaser actuator solenoid, the internal screens fall off and land in the bottom of the oil pan, this was a very common problem.

Sorry, I'm talking about the cam phaser actuator, its on the side of the cylinderhead behind the power steering pump, check that first for missing screens, the sproket is inder the valve cover and runs the intake cam.I would check the phaser first, very common.

There is 2 actuators, first one is the cam phaser actuator sensor, which is the one on the cyl head behind the p/s pump, thats the one that goes bad all the time, the second actuator is the sprocket which is under the valve cover and attached to the front of the exhaust cam, they 2 sometimes go bad, to find out which one you need a scan tool to command the actuator on/off to see if its advancing and retarding the cam timing, thats what the actuator does. As far as the p0014 there is a software update for that code. As far as replacing the chain I would not, because I've done alot of these and there a total nightmare, I would be more concerned with the cam phaser actuator and possibly the circuit that controls it.