DTC B1558: BCM EPROM Checksum Error: Description

At beginning of ignition cycle, Platform Zone Module (PZM) adds the checksum of Electronically Erasable Programmable Read Only Memory (EEPROM) block and that block's twos complement. DTC B1558 will set when value of addition does not equal zero. When DTC B1558 is set, PZM will clear all codes, set DTC B1558 as current and default to the following:

• Personalization
  
  Factory Default
• Ignition Cycle Counter
  
  Zero
• Theft Alarm Condition
  
  Cleared