Code 63
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
Scan tool displays PCM FAILURE EEPROM WRITE DENIED. Condition is: unsuccessful attempt to write to EEPROM location by PCM.