23 March, 2025Allison WTEC II Fault Code: 36 PID: SPN: 00 FMI: Mismatch between ECU hardware and software Main code 36 indicates the system has detected a mismatch between the ECU hardware and the ECU EPROM software or that there is a TransID (TID) problem. 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.