When ck engine light is on the car won't shift gears and if I reset computer it will work fine

Hello, in the situation you are describing, the check engine light is coming on due to a concern that is causing the transmission to engage a "fail safe" mode. It's actually a method of protecting against more component damage and engaging in unsafe driving due to a component concern. Have the vehicle tested as soon as possible to troubleshoot what is happening causing the vehicle to get into this mode. Resetting things doesn't help - and can actually harm things. www.repairpal.com/repair-shops