NHTSA Complaint #11634242 — 2018 GMC ACADIA

We purchased our 2018 GMC Acadia, used with 15,798 miles on the odometer, on [XXX] from John Wiesner, Inc. On [XXX], with 20,344 miles on the odometer, we began experiencing a "Shift to Park" message when trying to turn the vehicle off, even though the vehicle shifter indicated that the vehicle was in park. Though the vehicle would turn off, we could not clear the "Shift to Park" message or stop the associated audible alarm without a great deal of effort. A Wiesner dealership confirmed the problem, determined that a switch in the shifter assembly was not grounding, and replaced the transmission control assembly under warranty. All was well until early 2024, at approximately 47,500 miles, when we began experiencing the same problem. The dealer said we must pay $500+ for a repair and that if we failed to get the problem repaired we risked being unable to get the vehicle into park and unable to turn off the vehicle. Being unable to stop the "Shift to Park" message or to stop the audible alarm at the very least will run the battery down and being unable to put the vehicle in park or turn it off risks an injury to us or others. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)