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VOLVOUU All Engines (2017 Emissions) Fault Code: P20C400 PID: ACM Aftertreatment Reagent Hose Heater 3 Short Circuit High
Conditions for diagnostic trouble code (DTC)
The voltage at pin A137:24 is above normal value
Observable symptoms
Ammonia smell can occur if the aftertreatment diesel exhaust fluid (DEF) warmed too much
Probable cause
1) Connector
2) Wiring harness
3) Aftertreatment Diesel Exhaust Fluid (DEF) Line Heater 3
