Cummins ISB CM850 (2003-06) Fault Code: 286 PID: SID 231 SPN: 639 FMI: 13 SAE J1939 Multiplexing Configuration Error – Out of Calibration. The ECM expected information from a multiplexed device but only received a portion of the necessary information.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe? Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM.

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)Repair or replace the data link harness.
2)Repair or replace the OEM harness.