When parked on an incline, engage emergency brake FIRST, then shift into Park. Hope this helps! Works for my Buick.
What about shift interlock? You need to step on brake to shift, do your brake lights work?
Sometimes there is a bypass button for the shift interlock, you press the button, then shift into neutral, parking brake set. With it in neutral you can start it and shift it. Your owners manual should have info on the bypass button. That button is usually close to the shifter, where applicable. If you don't have owners manual, my.gm.com should have your owners manual, it's free to read online.
This just happened to our Buick and the mechanic found a short in some wiring as the cause. It took them awhile to find it but the cost of repair was only around $100,
SOURCE: WONT SHIFT WHEN COLD
The seals in the transmission In the clutch apply are hardened or have flipped over and cracked. A rebuild wil fix this.
SOURCE: 2006 Buick Lucerne brake engage button
Your supposed to use your parking brake up or down
hills
If you don't you will not get the transaxle out of gear or break
the internal parking pawl
Been that way for 50 years on all vehicles with an automatic
The trans was not designed to hold the weight of the car with
a small piece of metal on the parking pawl,you brakes are for that
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i'm on level ground.it started to do this a few weeks ago but it did go into gear after tiring a few times.
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