Car acts up then no start

[Johnsonsho]

New to me 2014 SHO. Bought with issue that no mechanic can seem to solve. Car runs and drives great and then sometimes when you change the gear selection from drive to park or drive to reverse all of a sudden it looses it mind. Transmission pressure spikes and when it goes into gear it slams into reverse or drive. Also looses its gear position indicator on the dash. Give a collision avoidance error as well as a check engine message. If you shut it down it won’t even crank. Been to three shops. New range sensor x3 new TSS and OSS sensors in transmission. New solenoid valve body in transmission. New PCM with reprogram, new battery and checked and cleaned grounds. Checked wiring going to transmission from PCM Any ideas. Don’t really want to take it to the dealership but I’m at a point where I think I’m just gonna have to bite the bullet. Unless you guys have some insight

 

[SHOdded]

how is the fluid level and condition. i know of one SSM related to internal broken parts and loss of gear availability. hope thats not it but if so would need a rebuilt or remanned transmission.
http://shoforum.com/index.php?threads/complete-list-of-tsbs.113690/page-2#post-1458751

since you got a new pcm, i am assuming tunes are out of the picture.

 

[Johnsonsho]

Trans has been checked by specialist and is hood. Fluid is new and full. If you let the car sit for a little while it will crank back up and then shift hard into reverse and into drive and then when you put it back in neutral the indication will come back on the dash if you put it in park and shut it down and restart it all is good again until the next time it happens so the transmission functions properly once the computer resets

 

[jman1200]

The shifter itself maybe?

 

[Bluezone]

New to me 2014 SHO. Bought with issue that no mechanic can seem to solve. Car runs and drives great and then sometimes when you change the gear selection from drive to park or drive to reverse all of a sudden it looses it mind. Transmission pressure spikes and when it goes into gear it slams into reverse or drive. Also looses its gear position indicator on the dash. Give a collision avoidance error as well as a check engine message. If you shut it down it won’t even crank. Been to three shops. New range sensor x3 new TSS and OSS sensors in transmission. New solenoid valve body in transmission. New PCM with reprogram, new battery and checked and cleaned grounds. Checked wiring going to transmission from PCM Any ideas. Don’t really want to take it to the dealership but I’m at a point where I think I’m just gonna have to bite the bullet. Unless you guys have some insight

Sounds like a gear selection sensor problem or the wiring going to it.

 

[Shadow351]

Have any DTC's shown up? Can you run a scanner on it while it is acting up?