Volvo All Engines (2013 Emissions) Fault Code: P20B297 PID: ACM Reductant Heater Coolant Control Valve Control Performance/Stuck Open
Volvo All Engines (2013 Emissions) Fault Code: P20B297 PID: ACM Reductant Heater Coolant Control Valve Control Performance/Stuck Open
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)
Aftertreatment diesel exhaust fluid (DEF) temperature too low
Observable symptoms
Possible engine de-rate
Probable cause
1) DEF Tank Heating Valve installed backwards
2) Mechanical fault
3) Damaged or restricted actuator coolant lines
4) Aftertreatment diesel exhaust fluid (DEF) tank heater valve
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