News Technical Service Bulletins

Loose CATs Rattle Cadillacs

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Caddy 1

Note fastener location of bracket to pipes.

Owners of 2014-2015 Cadillac CTS sedans, XTS or ATS vehicles equipped with a 3.6L twin turbo engine might comment on a brief rattle or tick when revving the engine when the transmission is in park or neutral.

Caddy 2

Note location of bracket to transmission fasteners.

The same rattle or tick can sometimes be heard at the beginning or end of a vehicle acceleration while in drive. This might be due to the turbocharger wastegate. The condition might be caused by loose converter bracket nuts or might be a normal characteristic of the turbo wastegate.Inspect the M8 nuts that secure the catalytic converters to the exhaust bracket. If the nuts are loose, replace them with new torque-prevailing nuts, P/N 11546441.

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