Cummins ISX CM870 (2003-06) Fault Code: 286 PID: S231 SPN: 639 FMI: 13/13 The ECM expected information from a multiplexed device but only received a portion of the necessary information.

This fault can occur when the ECM is set up properly (components enabled and OEM VECU source addressed correctly) to receive information from an OEM VECU, but the OEM VECU is actually transmitting a message that says that component is not available for multiplexing.

Possible repairs:

1)Check OEM multiplex settings.