DTC P0601: Control Module Read Only Memory: Description

Powertrain Control Module (PCM) uses an Electrically Erasable Programmable Read Only Memory (EEPROM). The EEPROM contains program information and calibrations required for powertrain diagnostics operation. Unlike Programmable Read Only Memory (PROM) used in past applications, the EEPROM is not replaceable. When PCM is replaced or a calibration update is required, PCM must be programmed. Diagnostic Trouble Code (DTC) will set if PCM detects a problem with internal programing.