Hi all,
To anyone with a Chevy Volt experiencing shift to park issues... I recently read this article
https://lemonlawexperts.com/a-shift-in-focus-for-chevrolet-shift-to-park-defect/ which mentions that the tsb Chevy has released says to add an in-line shifter wire harness jumper between the console harness connector and the shifter base connector. Saw some posts on here about the problem, but never saw this solution in the forum- not sure if it will actually fix the issue, but wanted to include it for anyone having these problems in case you wanted to try it out. Seemed to work for me.