Method and control arrangement for operating an engine of a vehicle based on hardware limitations of the engine system

A method and a control arrangement for operating an engine of a vehicle comprising a combustion engine system are presented. The method comprising:monitoring a temperature parameter associated with a hardware limitation of the combustion engine system and a first engine speed;determining a second engine speed based on the hardware limitation when the temperature parameter meets a temperature threshold value associated with the hardware limitation, wherein the first engine speed is associated with a first gear and the second engine speed is associated with a second gear; andrequesting a gear shift from the first gear to the second gear.Hereby, the components of the vehicle's engine may be protected from excessive wear due to reaching or exceeding a hardware limitation of the combustion engine system and the risk of decreased engine component lifetime or even engine failure may be mitigated. Moreover, maximum vehicle performance may be obtained by reducing the risk of substantial drops of engine power output and decreased speed of the vehicle.