"Trouble Codes P0603 and/or P0605:
Some PowerStroke trucks may exhibit codes related to keep alive memory--KAM (P0603); or read only memory--ROM (P0605). P0603 may be set if the batteries or computer are disconnected. On the 7.3 P0603 can be cleared by running the engine for at least 30 seconds, thn clearing all codes. For the P0605 the computer should be reprogrammed with the latest available calibration. Broadcast Message 1076."