23 March, 2025Allison WTEC II Fault Code: 34 PID: SPN: 12 FMI: EEPROM, factory calibration compatibility number wrong Main code 34 indicates there is a problem with the calibration EEPROM, factory calibration compatibility number wrong Share on Facebook Opens in a new window. Tweet on Twitter Opens in a new window. Pin on Pinterest Opens in a new window. Back to blog Leave a comment Name * Email * Comment * Please note, comments need to be approved before they are published.