What to do if transmission is locked
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http://www.buick.com/content/dam/Buick/Global/master/nscwebsite/en/home/Owners/Vehicle_Manuals/01_Images/2007-Lucerne-Owner-Manual.pdf Page 125 f you cannot shift out of PARK (P), ease the pressure on the shift lever. Push the shift lever all the way into PARK (P) as you maintain brake application. Then move the shift lever into the gear you want Also from that page: Torque Lock If you are parking on a hill and you do not shift your transaxle into PARK (P) properly, the weight of the vehicle may put too much force on the parking pawl in the transaxle. You may find it difficult to pull the shift lever out of PARK (P). This is called torque lock. To prevent torque lock, set the parking brake and then shift into PARK (P) properly before you leave the driver’s seat. To find out how, see Shifting Into Park (P) on page 123 . If torque lock does occur, you may need to have another vehicle push yours a little uphill to take some of the pressure from the parking pawl in the transaxle, so you can pull the shift lever out of PARK (P) So no overrides, at least not in owners manual
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