Engine State Descriptions:
Aftertreatment Regeneration Active
The engine is performing a regeneration of the diesel particulate filter. This is normal operation during regeneration of the diesel particulate filter.
Air Density Limit State
The engine is currently being derated for high altitude conditions.
Air Fuel Control Derate
The engine fueling is being limited due to lack of oxygen (boost pressure). This state will normally be active for a few seconds during a hard acceleration to prevent excessive black smoke. Excessive time operating in this states indicates the lack of boost pressure (oxygen) entering the engine. Troubleshoot the air intake system.
All Speed Accelerator
The All Speed Governor is controlling the engine speed. This is a normal state when the throttle pedal is depressed and the All Speed Governor is enabled.
All Speed Governor Application
The industrial All Speed Governor is controlling engine speed. This is a normal state when the all speed governor is enabled.
Alternate Torque
This is a normal state when the alternate torque feature is enabled.
Alternator Failure Warning
The Alternator Failure Warning Feature is active. Check the alternator for correct operation.
Altitude Derate
The engine torque output is being limited due to high altitude conditions. Confirm the altitude operation of the engine and the ambient air pressure sensor reading.
Ambient Derate State
The engine torque output is being limited due to high altitude conditions. Confirm the altitude operation of the engine and the ambient air pressure sensor reading.
Anti-Theft Derate
An anti-theft device is currently derating the engine.
Automotive Governor
The Automotive Throttle is controlling the engine speed. This is a normal state when the throttle pedal is depressed and the automotive governor is enabled.
Charge Manager State
The ECM is limiting the amount of charge pressure to protect the air handling system. This is normal operation to prevent air handling system damage.
Coolant Derate State
The engine torque output is being limited due to high coolant temperature. Troubleshoot the high coolant temperature conditions.
Crank State
The engine is cranking and is in the process of starting. The engine speed sensor is receiving a good speed signal and the fuel system is delivering the recommended fueling to start the engine.
Cruise Control
The vehicle is currently operating with the cruise control feature active. This is a normal state when the vehicle is operating in cruise control.
Data Link Powertrain Protection State
The engines torque output is currently limited by the power train protection feature. Please verify the Powertrain Protection adjustable parameter settings.
Data Link Speed
The engine torque output is being controlled by a J1939 device such as an automatic transmission. This state should only be active during a shifting event.
Data Link Torque Derate
The engine torque output is being controlled by a J1939 device.
EGR Fueling Limit State
The engine is currently operating on the torque curve and maximum fueling. This is a normal state when the engine is operating at maximum fueling on the torque curve.
Engine Brake
The engine brakes are currently activated. This is a normal state when the engine brakes are active.
Engine Overspeed
The engine speed has exceeded the overspeed limit set in the calibration. The engine is being operated downhill or operating from a secondary fuel source.
Engine Protection
The engine torque output is currently limited by an engine protection state. Check the fault codes and determine the root cause of the engine protection derate.
Engine Protection Derate
The engine is currently being derated by an engine protection state. Check the fault codes and determine the root cause of the engine protection derate.
Engine Startup Oil Limit
The engine startup protection feature is limiting throttle control until oil pressure is reached. This is normal operation at startup until operating oil pressure is reached.
Engine Stop
This is a normal state when the key switch is on and the engine is not running.
Engine Warm-up Protection
The engine Warm-Up Protection feature is active. This is a normal operation at startup until operating oil pressure and temperature is reached.
Firetruck Governor
The firetruck governor is controlling the engine. This is a normal state when the firetruck governor feature is enabled
Fuel System Derate
A fuel system fault code is active and is currently limiting the engine torque and/or speed output. Check for active fuel system fault codes causing the derate.
Fueling High Speed Governor State
The engine is operating at the maximum engine speed. This is a normal state when the engine is operating on the high speed governor.
High Fuel Temperature Engine Protection
The engine torque output is being limited to to high fuel temperature. Troubleshoot the high fuel temperature conditions.
Industrial Auxiliary Governor
The industrial auxiliary governor is controlling engine speed. This is a normal state when the auxiliary governor is enabled.
Industrial Engine Speed Cruise Control
The industrial engine speed cruise control feature is active. This is normal operation when the engine speed cruise control feature is active.
Limp Home
A throttle pedal fault code is currently active, the throttle pedal operation will be disabled until the fault is cleared.
Load Based Speed Control
The Load Based Speed Control feature is active. Use INSITE™ to verify the Load Based Speed Control feature settings.
Low Speed Governor State
The engine is currently idling on the low speed governor. The throttle pedal is released, the vehicle is stationary, and the engine is idling.
Maximum Throttle
The engine is currently operating on the torque curve and maximum fueling. This is a normal state when the engine is operating at maximum fueling on the torque curve.
Momentary Engine Override
The engine speed is being momentarily overwritten by a device such as an automatic transmission. This state should only be active during shifting events.
Noise Control Derate
The injection timing is being adjusted to reduce engine noise. Excessive amount of time in this state could be caused by a failed barometric air pressure sensor.
OBD Fueling Derate
An OBD system fault is active and is currently limiting the engine torque and the speed output. Check for active fault codes or conditions causing the derate.
Out Of Gear
The ECM has detected the transmission is in neutral or the clutch has been disengaged.
Partial Throttle Limit State
The industrial hybrid governor is controlling engine. This is a normal state when the industrial hybrid governor feature is enabled.
Powertrain Protection Derate
The engine's torque output is currently limited by the power train protection feature. Please verify the Powertrain Protection adjustable parameter settings.
Primary / Secondary
This is a normal state when the multi-unit synchronization feature is active.
PTO
The engine speed is currently operating in Power Take Off Mode and being controlled by the Power Take Off feature.
PTO Derate
The engine torque output is limited in Power Take Off mode. Check for active fault codes causing the Power Take Off derate.
The vehicle's maximum speed is currently being limited by the Road Speed Governor setting. Check the adjustable parameter settings for tire size, rear axle ratio, transmission tail shaft gear teeth, and maximum vehicle speed.
The electronic control system has been configured so that engine performance testing can be done on a dynamometer without restrictions on Engine Speed, Power and Torque.
The engine is in the process of being shut down. The key switch has been turned off, but engine speed has not yet reached zero rpm.
The engine torque is limited by the Eaton Top 2 transmission. This state should only be active during a Top 2 transmission shifting event.
The engine speed is limited by the Eaton Top 2 transmission. This state should only be active during a Top 2 transmission shifting event.
The engine torque is limited by the Eaton Top 2 transmission. This state should only be active during a Top 2 transmission shifting event.
A fuel system fault is active and is currently limiting the engine torque or speed output. Check for charge air leaks in the system.
Turbocharger Fuel Control State
The engine torque output has been limited to reduce the engine exhaust temperature. Check for charge air leaks in the system.
The engine torque output has been limited to reduce the turbocharger speed. Check for high altitude operating conditions.
The turbocharger surge limit has been exceeded. Check the turbocharger for correct operation.
Vehicle Acceleration Management State
The vehicle acceleration rate is being limited by the Acceleration Management feature. Please verify the vehicle acceleration adjustable parameter settings.
Vehicle Speed Sensor Diagnostic
The engine speed is limited by the Maximum Engine Speed without Vehicle Speed Source feature. Please verify the Maximum Engine Speed without Vehicle Speed Source parame