DTC P0601: Control Module Read Only Memory: Description

Powertrain Control Module (PCM) uses an Electrically Erasable Programmable Read Only Memory (EEPROM) to store software and calibration information. PCM uses a checksum to verify integrity of the information. At time of programming, PCM calculates a checksum and stores the value in the EEPROM. With ignition on, PCM retrieves the information and performs a checsum. PCM compares the ignition on value to the value stored in the EEPROM. If checksum at ignition on does not match stored checksum, DTC P0601 will set.