That Whiny Cadillac Is Normal
This bulletin applies to 2013-2015 Cadillac ATS, 2008-2015 CTS, 2007-2017 SRX, 2006-2011 STS and 2006-2009 XLR vehicles. A high pitched whine noise may be heard from the vehicle with the key on and engine off, or for up to one minute after the engine has been shut off. The noise should be heard from outside the vehicle only or with a window open. The whine noise may be caused by the internal transmission solenoids being commanded to minimum line pressure by the TCM. This noise is an operating characteristic and no repairs should be attempted.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
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.