CAT 3406E (Prefix 5DS or 1LW) Fault Code: 59 PID: 252 SPN: FMI: 11 Engine Software Incorrect Posted by Diezel Solutions on April 12, 2025 The Engine Control Module (ECM) detects incorrect engine software . Probable Causes: 1) New ECM on vehicle, needs to be programmed2) Current ECM programmed incorrectly3) ECM Connection/harness Share Share on Facebook Tweet Tweet on Twitter Pin it Pin on Pinterest 0 comments Leave a comment Name Email Message Please note, comments must be approved before they are published