Method, computer program, computer-readable medium, control arrangement and a vehicle for downshifting gears in an uphill slope

A method 200 in a control arrangement 160 of a vehicle 100 and a control arrangement 160 for a vehicle for downshifting gears in an uphill slope 510 are presented. The method includes, when the vehicle 100 is travelling in an uphill slope 510 using an initial gear Ginit of the vehicle's automated manual transmission gearbox 103:- simulating 210 at least one speed profile vsim-1, vsim-2, ..., vsim-n for a downshift to, and a usage of, at least one gear Ginit-1, Ginit-2, ..., Ginit-n lower than Ginit;- determining 220 that a minimal speed vmin_1, vmin_2, ... vmin_ n of each one of the at least one simulated speed profile has a value indicating that the actual speed vact of the vehicle will be less than or equal to zero in the uphill slope 510;- opening 230 a clutch 106 before vact is reduced to a value less than zero;- activating 240 at least one vehicle brake 151, 152, 153, 154, 155;- shifting 250 vehicle's automated manual transmission gearbox 103 to a start gear Gstart;- closing 260 the clutch 106; and- deactivating 270 the at least one vehicle brake 151, 152, 153, 154, 155.