Cummins ISB CM850 (2003-06) Fault Code: 146 (Marine) PID: 100 SPN: 110 FMI: 0 Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level.

Posted by PerDiezel Solutions on January 18, 2026

Cummins ISB CM850 (2003-06) Fault Code: 146 (Marine) PID: 100 SPN: 110 FMI: 0 Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level. Engine coolant temperature signal indicates engine coolant temperature is above engine protection warning limit.

This fault code indicates that coolant temperature has exceeded the engine protection limits for high coolant temperature. Refer to Engine Coolant Temperature Above Normal symptom troubleshooting tree.

Possible repairs:

1)This fault code indicates that coolant temperature has exceeded the engine protection limits for high coolant temperature. Refer to Engine Coolant Temperature Above Normal symptom troubleshooting tree.

Possible repairs:

1)Refer to the Engine Coolant Temperature Above Normal symptom tree in Troubleshooting and Repair Manual, ISBe and ISB (Common Rail Fuel System) Series Engines, Bulletin 4021271.

Cummins ISB CM850 (2003-06) Fault Code: 146 (Auto) PID: 110 SPN: 110 FMI: 0 Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level. Engine coolant temperature signal indicates engine coolant temperature is above engine protection warning limit.

Cummins ISB CM850 (2003-06) Fault Code: 145 (Marine) PID: 110 SPN: 110 FMI: 4 Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at engine coolant temperature circuit.

Cummins ISB CM850 (2003-06) Fault Code: 145 (Auto) PID: 110 SPN: 110 FMI: 4 Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at engine coolant temperature circuit.

Cummins ISB CM850 (2003-06) Fault Code: 144 (Marine) PID: 110 SPN: 110 FMI: 3 Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at engine coolant temperature circuit.

Cummins ISB CM850 (2003-06) Fault Code: 144 (Auto) PID: 110 SPN: 110 FMI: 3 Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at engine coolant temperature circuit.

Cummins ISB CM850 (2003-06) Fault Code: 143 (Marine) PID: 100 SPN: 100 FMI: 1 Engine Oil Rifle Pressure – Data Valid but Below Normal Operational Range – Moderately Severe Level. Engine oil pressure signal indicates engine oil pressure is below the engine protection warning limit.

WARNING!