Check engine light is on and transmission is stuck in third gear?

Good morning,

Codes do not tell you to replace anything. They tell you there is a failure in that system.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://www.2carpros.com/articles/how-a-mass-air-flow-sensor-works-maf

Can you list the code number for me to see? Then I can check that code to see if there is a connection to the transmission issue.

https://www.2carpros.com/articles/automatic-transmission-problems

Have you changed the fluid in the transmission?

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy