VOLVOUU All Engines (2013 Emissions) Fault Code: P20F400 PID: EMS DEF Consumption Too Low
This DTC indicates that the amount of consumed DEF calculated by the ECM does not correspond to the level change in the DEF tank.
Conditions for diagnostic trouble code (DTC):
1) Aftertreatment diesel exhaust fluid (DEF) is used and the level change does not correspond to the consumption
Observable symptoms
1) Low aftertreatment diesel exhaust fluid (DEF) solution consumption
Probable cause
1) The sensor float is stuck
2) Clogged DEF system
3) Wrong tank
4) Aftertreatment diesel exhaust fluid (DEF) dosage valve
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