Transmission won't shift into drive help

[jscruick]

Have a 2009.5 G8GT 28K miles, automatic with Frost tune installed 2/12. Stopped @ 7/11 after driving about 50 miles. Restarted car, would not go into Drive, only Reverse. Disconnected negative lead on battery, no change.

Only after running shift through gears over 10 minutes it finally went into drive and drove normal, checked level of tranny fluid, in normal range.

This has now happen three times today and after I cut off car restart and try to place in Drive

Any ideas? John

[-Ray-]

You need a Tech II to see what's going on.

[jscruick]

So I need to swap out custom tune for stock before going to Dealership

[-Ray-]

Talk to the service writer. I have good relationships with 2 dealerships so I never had to remove my tune.