• Quieting Cadillac whistling noise

    This bulletin applies to 2016-2020 Cadillac CT6 vehicles. Customers may comment about a whining/whirring, whistling, squeaking or groaning/growling noise at low speed maneuvers up to 40 mph.
    July 8, 2025

    This bulletin applies to 2016-2020 Cadillac CT6 vehicles. Customers may comment about a whining/whirring, whistling, squeaking or groaning/growling noise at low speed maneuvers up to 40 mph.

    The noise may seem to be coming from the engine/wheel area. The cause may be fretting between the intermediate shaft and the front intermediate shaft bearing/housing (IDS bearing).

    The fretting is the result of having a slip fit interface between the bearing and the IDS shaft, combined with a bearing that has around 0.5 Nm of torque to rotate.

    Perform a road test to identify the noise at this area. Chassis eras will be helpful.

    If confirmed, replace the IDS shaft and IDS shaft housing.

    About the Author

    Mike Mavrigian

    Motor Age Editor

    Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of  specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.

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