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Cummins ISB CM850 (2003-06) Fault Code: 779 PID: SID 51 SPN: 703 FMI: 11 Auxiliary Equipment Sensor Input #3 (OEM Switch) – Root Cause Not Known. This fault code is activated when the pressure or temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. An engine power derate is possible depending on the OEM application. Possible repairs: 1)Replace the OEM harness.

Cummins ISB CM850 (2003-06) Fault Code: 784 PID: SPN: 1590 FMI: 2 Loss of communication with adaptive cruise control. The ECM triggers this fault when the ?heartbeat? signal from the data bus is not received. Possible causes: 1)The adaptive cruise hardware is not installed on the vehicle and the adaptive cruise feature has been enabled.2)The broadcast signal from the adaptive cruise is not being received. Refer to the OEM troubleshooting and repair manual and the Adaptive Cruise Hardware Manual. Possible repairs: 1)Clean the connector and pins.2)Repair the damaged harness, connector or pins, if possible.

Cummins ISB CM850 (2003-06) Fault Code: 951 PID: 166 SPN: 166 FMI: 2 Cylinder power imbalance between cylinders. A power imbalance between cylinders was detected by the ECM. If Fault Code 951 is inactive in the ECM memory and there is no complaint such as ?low power? or ?engine misfire,? it is possible that an intermittent event such as air entering the fuel system following a filter change caused the fault. Inactive counts of Fault Code 951 should be disregarded unless other performance symptoms are present. Causes of cylinder imbalance can include: 1)Faulty engine brakes (look for brakes out of...

Cummins ISB CM850 (2003-06) Fault Code: 957 PID: 27 SPN: 27 FMI: 2 EGR Valve Position – Data erratic, intermittent, or incorrect. Intermittent EGR position information is being received by the electronic control module (ECM). This fault code is caused by an internal failure of the EGR valve position sensor. This failure causes erratic readings of EGR valve position. The troubleshooting information for fault code 957 is the same as fault code 1228. Refer to fault code 1228 for the fault code troubleshooting information. Possible repairs: 1)Replace the EGR position sensor.

Cummins ISB CM850 (2003-06) Fault Code: 958 PID: 27 SPN: 2795 FMI: 2 VGT Position Sensor – Data erratic, intermittent, or incorrect. Intermittent variable geometry turbocharger (VGT) position information is being received by the electronic control module (ECM). This fault code is caused by an internal failure of the variable geometry turbocharger (VGT) position sensor. This failure causes erratic readings of the variable geometry turbocharger (VGT) position. The troubleshooting information for fault code 958 is the same as fault code 1229. Refer to fault code 1229 for the fault code troubleshooting information. Possible repairs: 1)Replace the turbocharger position sensor.2)Replace the...