Cummins ISX CM870 (2003-06) Fault Code: 151 PID: P110 SPN: 110 FMI: 0/0 Engine Coolant Temperature – Data Valid But Above Normal Operating Range – Most Severe Level. Engine coolant temperature signal indicates engine coolant temperature above engine protection critical limit.

The engine coolant temperature sensor measures the temperature of the engine coolant as it passes through the thermostat housing. This fault code is activated if the engine coolant temperature is above 116?C [241?F].

Possible causes:

1)Obstructed radiator
2)Plugged vent lines
3)Aerated coolant
4)Other cooling system failure.