i'm gonna try to explain my problem,today i went to my car and put the key on start position and waited to the check engine light go off(like always)but remained on and the my car has transmition problem like dosn't shift to 2 gear,(its a automatic)then like 30 minutes later start again and the light go off(like is supposed) and the transmition is fine,i dunno if i explain myself clear but the thing is ,can the ecu interfer with the transmition?????????
__________________
DOMINICANO HASTA LA TAMBORA

 

just stating the obvious but did you check the tran fluid?