Turbocharger Noise

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

It is normal for the turbocharger to emit a whining sound that varies in intensity, depending on turbine wheel speed. The sound is caused by the very high rotational speed of the rotor assembly and the method used to balance the rotor assembly during manufacturing. Because the engine uses a two stage turbocharger, the sound may not be the loudest at rated engine speed and load. Depending on engine and aftertreatment requirements for exhaust temperatures and exhaust pressure, the sound may be most noticeable around idle speed conditions or slightly above.