151
What This Code Means
Engine coolant temperature has exceeded the alarm (shutdown) threshold; Engine Coolant Temperature High (Shutdown); Engine shutdown; Engine Coolant Temperature High (Warning); Engine has begun to overheat; Engine coolant temperature has risen to an unacceptable level; Engine is operating near cooling system capacity; Engine has overheated; Coolant temperature has risen above the shutdown trip point; Coolant level is low; Intake manifold temperature has risen above the shutdown trip point; Engine coolant level has fallen below the trip point; Derate lamp active; High Intake Manf 1 temp message displayed; Engine hot shutdown has occurred; Cooldown timers were bypassed; Warning lamp active; Engine Hot Shut Down message displayed; Communication between the engine control (ECM) and the PowerCommand 3.3 control has been severed; Shutdown lamp active; CAN Data Link Failure message displayed; Control is in Battle Short mode; Battle Short Active message displayed; Triggered configurable custome
Possible Causes
- •Blocked enclosure air discharge
- •Blocked radiator
- •Broken or loose fan belt
- •Collapsed, distorted, or leaking upper and lower radiator hoses
- •Contaminated coolant and scale
- •Coolant leakage
- •Coolant level below specification
- •Coolant level is below specification
- •Cooling system components are damaged or obstructed
- •Damaged fan shroud or air recirculation baffles
- •Damaged radiator cap and gasket or improper pressure operation
- •Damaged, worn, or improperly tensioned fan belt(s), pulleys, or belt tensioner
- •Enclosure air intake blocked
- •Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature
- •External contaminants on cooling system components
- •High ambient temperature
- •Higher ambient temperature
- •Increase in load
- •Loose or damaged fan belt
- •Low coolant level
- •Obstructions to cooling airflow
Suggested Actions
- 1Check coolant level and add coolant if applicable.
- 2Inspect cooling system components for internal contaminates (dirt, scale, or sludge) by opening the radiator cap and inspecting for contaminated coolant and scale. Clean as required, and contact your local dealer if flushing of the cooling system is required.
- 3Inspect cooling system components internally for contaminants (dirt, scale, or sludge) by opening the radiator cap, and contact local dealer if flushing is required.
- 4Inspect enclosure air discharge for dirt, debris, or obstructions and remove blockage or snow/ice buildup if applicable.
- 5Inspect fan belt(s) for damage, wear, and proper tension. Inspect pulleys and belt tensioner for damage or wear. Contact your local dealer if repair or replacement is required.
- 6Inspect fan belt(s), pulleys, and belt tensioner for damage, wear, and proper tension. Contact local dealer if repair or replacement is required.
- 7Inspect fan shroud and air recirculation baffles for damage and clearance. Contact local dealer if repair or replacement is required.
- 8Inspect fan shroud and air recirculation baffles for damage and clearance. Contact your local dealer if repair or replacement is required.
- 9Inspect radiator cap and gasket for damage and proper pressure operation. Contact local dealer if repair or replacement is required.
- 10Inspect radiator cap and gasket for damage and proper pressure operation. Contact your local dealer if repair or replacement is required.
- 11Inspect radiator for dirt, debris, or obstruction and remove blockage.
- 12Inspect radiator, charge air cooler, and other cores for damaged fins, dirt, debris, or obstructions, and remove blockages.
- 13Inspect the engine, cooling system, and surrounding area for external coolant leaks. Contact local dealer if a leak is present.
- 14Inspect the engine, cooling system, and surrounding area for external coolant leaks. Contact your local dealer if a leak is present.
- 15Inspect upper and lower radiator hoses for collapse, distortion, or fluid leaks. Contact local dealer if repair or replacement is required.
- 16Inspect upper and lower radiator hoses for collapse, distortion, or fluid leaks. Contact your local dealer if repair or replacement is required.
- 17Reduce loads or recirculation of discharge air to generator in elevated ambient.
- 18Reduce loads or recirculation of discharge air to generator set.
- 19Verify the coolant level is correct via the sight glass and add coolant as necessary.
- 20Verify the coolant level is correct via the sight glass. Add coolant as necessary.
ASK RUDY ABOUT THIS FAULT
Get a diagnosis walkthrough for 151 on your specific Cummins unit — cited to the OEM manual, not a forum guess.
Free account required — we'll bring your question with you.