Volvo All Engines (2017 Emissions) Fault Code: P204300 PID: EMS Aftertreatment Reagent Tank Temperature Sensor Stuck
Volvo All Engines (2017 Emissions) Fault Code: P204300 PID: EMS Aftertreatment Reagent Tank Temperature Sensor Stuck
Circuit description
Aftertreatment Control Module (ACM) monitors DEF tank temperature and uses it to control the Aftertreatment DEF Tank Heater valve to keep the DEF from freezing.
This temperature monitoring is also used to avoid stopped DEF dosing due to high DEF tank temperatures. If the DEF temperature is too high, reverse flow will be activated, if the temperature stays high for a short duration, a DTC is set.
Conditions for diagnostic trouble code (DTC)
Temperature above 70 °C (158 °F)
Observable symptoms
No aftertreatment diesel exhaust fluid (DEF) dosage
Probable cause
1) Extreme driving conditions (High ambient temperature)
2) DEF Tank too close to hot object
3) DEF Tank heating valve stuck open
4) DEF Tank Heating Valve installed backwards
5) Temperature Sensor, Aftertreatment diesel exhaust fluid (DEF) tank
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