SCR closed loop
SCR closed loop at maximum limit. Fault number 520372 FMI 16. This is a fault that sets when the after treatment system has an abnormal reading of DEF consumption. The system is showing that too much DEF is being used to maintain the SCR conversion. To my knowledge there is not a permanent solution to this issue only this temporary repair.
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How the SCR system works and how to think through problems
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AFTERTREATMENT FAILURE / SCR CLOOSED LOOP / 520372 FMI 16
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SCR CLOSED LOOP CONTROL AT MAXIMUM LIMIT DEF quality low fix on 2017 freightliner DD15 engine
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NOx efficiency Low, Improper DEF quality faults. Diagnostic work
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Freightliner Cascadia Detroit DD15 SCR conversion efficiency low spn 4364 fmi 18
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Cascadia SCR closed loop DTC 520372
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Freightliner cascadia DD13 DD15 DD16 Emissions derate bypass 5 miles per hour SCR DEF light blinking
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Freightliner/Detroit ONE BOX SCR Conversion Efficiency Low Fault Code - Easy Fix
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Detroit DD13/15/16 - SCR NOx Conversion Eff. Low
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cascadia scr closed loop DTC 520372 16
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