12 April, 2025CAT 3406E (Prefix 5DS or 1LW) Fault Code: 02 PID: 244 SPN: FMI: 2 Event Recorder Data Lost The ECM detects the following conditions: •The unswitched battery connection has been disconnected from the ECM. Probable Causes: 1) ECM Connection/harness2) Battery voltage at ECM3) Truck battery or battery cable issue4) Aftermarket engine protection switch5) ECM Failure 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.