Cummins ISB CM850 (2003-06) Fault Code: 2195 PID: SID 51 SPN: 703 FMI: 14 Auxiliary Equipment Sensor Input Engine Protection Critical – Special Instructions. OEM switch signal on the OEM harness indicates engine protection condition.

Verify the engine 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.

Verify with the driver the engine operating condition when the fault occurs. Depending on the engine speed and load, the OEM switch can detect a condition that falls below or exceeds the engine protection limit. Refer to the OEM service manual for more information.

Possible repairs:

1)Replace the OEM sensor.