Volvo All Engines (2017 Emissions) Fault Code: P204A11 PID: ACM Reductant Pressure Sensor
Volvo All Engines (2017 Emissions) Fault Code: P204A11 PID: ACM Reductant Pressure Sensor
Circuit description
The aftertreatment control module (ACM) uses the aftertreatment diesel exhaust fluid (DEF) dosing pressure sensor value to adjust and maintain DEF pressure at the DEF dosing valve by controlling DEF pump speed. If the pressure decreases below expected value when the pump is in initial pressure build-up mode or if the pressure increases above expected value when pump is in idle speed mode, the ACM considers DEF pressure outside of normal operating range and indicates a malfunction in a DEF dosing pressure sensor.
Conditions for diagnostic trouble code (DTC)
The voltage at pin A137:30 is less than 0.2 V
Observable symptoms
No aftertreatment diesel exhaust fluid (DEF) dosage
Probable cause
1) Urea Pressure Sensor
2) Wiring harness
3) Aftertreatment Diesel Exhaust Fluid (DEF) Pump
Detailed information
Possible engine de-rate
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