Volvo Engine D11L (Tier 4) Fault Code: P204786 PID: PSID 89 FMI: 12 Reductant Injection Valve Control Bank 1 Unit 1 - Signal Invalid

CONTROL UNIT:
Engine ECU

FAILURE EVENT:
Malfunctioning of the DEF pump unit detected from ACM. The SCR system is not able to dose DEF.

SYMPTOM:
1. SCR system does not work properly.
2. Low power because of engine derate.

CONDITIONS:
None

INHIBITING THE DTC:
None

POSSIBLE CAUSES:
1. Clogged DEF dosing injector.
2. Clogged DEF hose.
3. Defective DEF dosing injector.
4. Damaged wire harness or connector.

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