DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681 & P1683: Pcm Memory: Description
WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Powertrain Control Module (PCM) electrically erasable programmable read only memory (EEPROM) contains data which is essential for operating engine and transmission. PCM continuously tests integrity of this data.