It's been a while that my Volvo vnl 2016 ishift,while parked and running engine shows "L" ( Instead of E- economic or P - Performance) on the dashboard display. This happens usually when applied a parking brake or pedal brake. It also happens sometimes when I shift from neutral to drive and L appears on dashboard. While L the ishift does not respond and I have to turn off the truck and restart again. Anyone have any idea what is going on?