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VOLVOUU All Engines (2017 Emissions) Fault Code: P20B100 PID: ACM Reductant Heater Coolant Control Valve Control
Circuit description
This diagnostic trouble code (DTC) indicates malfunction in the aftertreatment diesel exhaust fluid (DEF) tank heater valve or related wiring. The function of the aftertreatment DEF tank heater valve is to allow engine coolant flow to the aftertreatment DEF tank heater element which keeps the DEF from freezing. Frozen DEF may result in no DEF dosing which causes limited vehicle operation.
Conditions for diagnostic trouble code (DTC)
Open circuit
Observable symptoms
Aftertreatment diesel exhaust fluid (DEF) temperature too low
Possible engine de-rate
Probable cause
1) Open circuit, Control wire (-)
2) Open circuit, Common voltage supply
3) Wiring harness
4) Aftertreatment diesel exhaust fluid (DEF) tank heater valve
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