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DTC 2-1: EEPROM Communication Error; DTC 2-2: EEPROM Checksum Error: Description

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

These DTCs are output when an error occurs in the CPU of the mayday ECU.

DTC DETECTION CONDITION CHART

DTC Code DTC Detection Condition Trouble Area
2-1 Internal communication error in mayday ECU Mayday ECU
2-2 Checksum error in mayday ECU Mayday ECU
DTC CHART

Current DTC Historic DTC only
Disconnect and reconnect battery Check for current DTCs If DTC returns, replace mayday ECU and mayday battery (backup battery) If this is only a histonc DTC, the system has already recovered normally and should be operating normally Clear historic DTCs