VOLVOUU All Engines (2010 Emissions) Fault Code: SPN 631 FMI 12 PID: PSID 124 Calibration memory

Conditions for diagnostic trouble code (DTC):
1) Internal fault in electronic control unit (ECU)

Observable symptoms
1) No aftertreatment diesel exhaust fluid (DEF) dosage

Probable cause
1) Dosage electronic control unit (ECU), pump unit