DEF LOW REFILL DEF

UnclassifiedEmissions

What This Code Means

DEF Indicator flashing; Alarm Lamp flashing; Alarm Lamp ON; Unit enters intermittent operation; Emergency shutdown activates; Engine Emission Indicator flashing; DEF Indicator Flashing; DEF Indicator ON; Engine Emission Indicator Check Engine Indicator Alarm Lamp Flashing; Engine Emission Indicator Check Engine Indicator Alarm Lamp ON; DEF indicator is displayed ON; Alarm lamp is flashing; DEF Low Refill DEF pre-alarm screen message is displayed; DEF Presvr Inducmt alarm screen message is displayed; Unit enters emergency shutdown; Engine restart is unavailable; Alarm lamp is displayed ON; DEF Severe Inducmt alarm screen message is displayed; DEF indicator is displayed on the digital controller

Possible Causes

•Low DEF level
•No supply of DEF
•DEF warnings are ignored
•Use of poor quality DEF
•Problems with DEF dosing
•Disconnection of sensors
•Ignored warning levels
•Tampering
•Repeat offense
•DEF tank level is below 10%
•DEF tank level is below 5%
•DEF level has reached 0%
•DEF quality is poor

Suggested Actions

1Replace the DEF filter (located in the urea SCR system supply module) every 1,000 hours of operation
2Refer to the Replacement of DEF Filter section in the Isuzu engine owner’s manual
3Refill DEF
4Refer to the Replacement of DEF Filter section in the Isuzu engine owner's manual
5Activate Escape mode to restart the unit (note: unit will only run for 30 minutes)
6Check active diagnostic trouble codes (DTC)

Related Multiquip Fault Codes

DEF PRESVR INDUCMT DEF PRESVR INDUCMT A DEF LOW 15% WA DEF PRESVR INDUCMT DEF LOW REFILL DEF DEF LOW 15%DEF QUALITY POOR DEF LOW 10% SD DEF SEVERE INDUCMT DEF LOW 10%DEF SEVERE INDUCMT A DEF LOW 5% SD DEF SEVERE INDUCMT DEF LOW REFILL DEF

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