TSB's

Noisy Caddy

Some owners of 2016-2019 Cadillac ATS and 2014-2019 CTS Sedan vehicles equipped with a 3.6L engine may comment about a brief rattle or ticking noise that is heard when revving the engine in Park/Neutral.

The same noise can sometimes be heard at the beginning or end of vehicle acceleration while in Drive. The noise may also be heard when cold, and may go away when warmed up.

The cause may be a loose wastegate arm for the turbocharger or loose catalytic converter bracket nuts.

PART ......................................................... P/N

Spring, turbo wastegate actuator rod......... 12686941

Inspect for loose catalytic converter mounting nuts.
<p>Inspect for loose catalytic converter mounting nuts.</p>

Also check for loose M8 nuts that secure the exhaust bracket to the transmission. If these nuts are loose, replace with new torque prevailing nuts.
<p>Also check for loose M8 nuts that secure the exhaust bracket to the transmission. If these nuts are loose, replace with new torque prevailing nuts.</p>

If the rattle noise is coming from the wastegate actuator arm, it will be necessary to get the part number off of the turbo that is currently installed. Remove the actuator arm retainer (1) that secures the arm to the wastegate valve.
<p>If the rattle noise is coming from the wastegate actuator arm, it will be necessary to get the part number off of the turbo that is currently installed. Remove the actuator arm retainer (1) that secures the arm to the wastegate valve.</p>

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