When the car is driven at a speed of 40 or more it sounds as though it is at a high idle. The rpm stay at a little over 2 during this time. What could be the problem?
High idling on 2006 Nissan Sentra
If its at around 2000 rpm at 40mph in an automatic, that sounds normal. Depending on how quick you want to get up to speed, its been my experience, automatic shifting occurs 3200-6000 rpm. If it is causing you great stress or worry, double check with your mechanic and make sure you are up to date on your maintenance schedule, especially for the drivetrain.