No, the gearbox consists of the gears; the clutch is really a separate component that connects the engine towards the transmission. In non-hybrid cars, B mode selects a decrease gear to raise engine braking. In electric, B manner increases the volume of regenerative braking once you launch the accelerator pedal. https://sethnsuts.tinyblogging.com/not-known-details-about-gearbox-auto-77813899