supply voltage of control unit is too low sensor problem in gear/mission jolting

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Dear Sir, Many thanks for your kind reply yesterday, Please guide me on following; The supply voltage of the control unit is too low. (Battery Voltage 14.41V) Control unit N10/2 (Rear SAM control unit with fuse and relay module) is not transmitting data on the CAN bus. Control Unit A1 (Instrument cluster is not transmitting data on the CAN bus. Does i have to have to change mission sensor?for this purpose have to dismantling the whole mission? Please guide me it is serious problem or minor?