Transmission

What is your question?

My 2011 Impala stopped shifting into overdrive. It operates fine in gears 1, 2, 3, and R. What are possible causes? I drove home using 3rd gear with no issues. RPMs were a little higher, but it was a smooth ride. Is continuing to drive in 3rd gear a problem? I primarily drive local within an 8 mile radius only a couple times a week. I've read other forums saying it is actually a much smoother ride driving in 3rd and with no issues. If there is already possible damage to the transmission, would driving it in 3rd further cause damage?

How long has your 2011 Chevrolet Impala had this problem?

Started today