HomeAll RepliesReply To: Shut off Extended Parking Timeout 2024 Sierra Reply To: Shut off Extended Parking Timeout 2024 Sierra Sponsored August 6, 2024 at 6:03 am #825495 chriscsgParticipant Thanks Parts Man but the extended park is different than the auto shut down. Auto shut down works when the transmission is in drive. I want my truck to stay at idle while in park. Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored