# Transmission not shifting **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [December 31, 2007, 4:36pm UTC](https://community.cartalk.com/t/transmission-not-shifting/8874 "2007-12-31T16:36:51Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![don\_poore](https://avatars.discourse-cdn.com/v4/letter/d/49beb7/32.png) [@don\_poore](https://community.cartalk.com/u/don_poore)\ **Post date:** [December 31, 2007, 4:36pm UTC](https://community.cartalk.com/t/transmission-not-shifting/8874/1 "2007-12-31T16:36:51Z")
1995 olds aurora not shifting into overdrive, intermittent issue ---
**Author:** ![researcher](https://avatars.discourse-cdn.com/v4/letter/r/edb3f5/32.png) [@researcher](https://community.cartalk.com/u/researcher)\ **Post date:** [January 1, 2008, 9:32pm UTC](https://community.cartalk.com/t/transmission-not-shifting/8874/2 "2008-01-01T21:32:17Z")
A lot of automatics will not shift into overdrive until the engine has reached operating temperature to control cold engine emmissions. If the lockout is happening inappropriately, have a transmission technician scan the computer to see if any codes are set and scan the transmission fluid temperature thermistor to see if it is reading appropriately. Also he can run a scan while the car is operating to see if the computer is commanding overdrive and the event is not occuring. Get back to us with what you or mechanic finds.