The code B1256 shows for the error of engine. When the car is diagnosed, then the computer shows the error. The technician needs to identify the reason for solving the problem. The instrument cluster has installed in self-diagnostic mode that can be retrieved by persistent and holding the gadget cluster RESET or SELECT key. Insert the detonation key and turn to the RUN position. Continue to press and hold the SELECT or RESET key (hold for 5 seconds) until the word TEST is exhibited by the odometer. Release the SELECT/RESET key within 3 seconds after the word TEST is showed to begin the self-diagnostic mode.