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Common faults & fault codes related to Tata BS6 Doser Pump Unit (278949200105):
DEF dosing pump not building pressure – Fault code: P20E8 (Low reductant pressure)
Pump electrical/open circuit issue – Fault code: P20EE / P20E9 (Dosing control malfunction).
Blocked or crystallized DEF in pump – Fault code: P204F (Reductant system performance).
Internal pump failure or overheating – Fault code: P21CA / P21CB (Reductant pump control).
Communication or sensor feedback error – Fault code: P2063 / P2064 (Reductant level/pressure signal).