ON CERTAIN MOTOR HOMES AND TOUR COACHES, A ‘CHECK TRANS’ WARNING LIGHT WHICH IS REQUIRED BY ALLISON TRANSMISSION INSTALLATION INSTRUCTIONS WAS OMITTED. IN THE EVENT THE TRANSMISSION SHIFT SELECTOR MALFUNCTIONS (LOOSES POWER OR SENDS ERRONEOUS SIGNALS TO THE TRANSMISSION ELECTRONIC CONTROL UNIT), THE COMPUTER WILL STOP ACCEPTING INPUT FROM THE ELECTRONIC SHIFT SELECTOR UNIT. IF THIS CONDITION OCCURS, THE TRANSMISSION WILL BE HELD IN THE LAST VALID RANGE SELECTED. ALTHOUGH THE SINGLE DIGIT RANGE SELECTED DISPLAY ON THE SHIFT SELECTOR WILL BE BLANK OR A DASH, THE DRIVER MAY NOT BE AWARE THAT A MALFUNCTION HAS OCCURRED.