Download DESCRIPTION These diagnostics apply to internal microprocessor integrity conditions within the engine control module (ECM). P0601 CONTROL MODULE MEMORY This DTC will set if the ECM has detected a fault with its read only memory (ROM). The ROM is checked continuously with ignition ON. The engine will not start if a fault is detected at start-up. P0602 CONTROL MODULE NOT PROGRAMMED IMPORTANT: This DTC does NOT indicate a faulty ECM.