Volvo All Engines (2013 Emissions) Fault Code: P21CA00 PID: ACM Reductant Control Module Supply Voltage
Volvo All Engines (2013 Emissions) Fault Code: P21CA00 PID: ACM Reductant Control Module Supply Voltage
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):
1) The voltage at pin A137:62 is below normal value
Observable symptoms
1) No aftertreatment diesel exhaust fluid (DEF) dosage
Probable cause
1) Open circuit, Common voltage supply
2) Short circuit to ground, Common voltage supply
3) Wiring harness
4) Aftertreatment Diesel Exhaust Fluid (DEF) Pump
Detailed information
1) Possible engine de-rate
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