Service Repair

GM Park Assist Isn't Much Help

July 5, 2022

The park assist feature of some 2009 GM models — including Buicks, Cadillacs, Chevys, GMCs and the Saturn Outlook — may not be operative, and the vehicles may be showing messages that indicate a problem.

Information courtesy of Mitchell 1,

Mike Mavrigian

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Some owners of 2009 Buick Enclave; Cadillac Escalade, Escalade ESV, Escalade EXT; Chevy Avalanche, Silverado, Suburban, Tahoe, Traverse; GMC Acadia, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL; or Saturn Outlook vehicles may comment that the rear parking assist system is inoperative. They may also state that either “Park Assist Off” or “Service Park Assist” messages may be displayed.

If this is encountered, perform diagnosis using either the Parking Assist System Malfunction or the specific DTC based on the diagnostic system check in SI. It may be helpful to reference PIT4828 (Park Assist Off) Message on DIC.

Important: If the sensor is removed, please note the position of the sensor alignment marks as shown in the photos here.

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.

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.