CAT 3406E (Prefix 5DS or 1LW) Fault Code: 56 PID: 253 SPN: FMI: 2 Check Customer or System Parameters

Conditions Which Generate This Code:

This condition indicates a customer specified parameter or a system configuration parameter that requires programming has not been programmed.

Probable Causes:

1) New ECM on vehicle, needs to be programmed
2) Current ECM programmed incorrectly
3) ECM Connection/harness