Sometimes when I start my 06 Chevy Cobalt, the computer LED display that displays the outside temp/odometer/etc. below the RPMs displays "Unknown? PL Only" and it won't display anything else until I restart the car. Usually, restarting the car does the trick...but I don't want to start the car twice every time I drive. What does "Unknown? PL Only" mean and how can I fix it?
