Volvo Engine D11L (Tier 4) Fault Code: P208A86 PID: PSID 121 FMI: 12 Reductant Pump “A” Control – Signal Invalid
Volvo Engine D11L (Tier 4) Fault Code: P208A86 PID: PSID 121 FMI: 12 Reductant Pump “A” Control – 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. Damaged wire harness or connector
2. Defective DEF pump unit pressure sensor.
3. Defective DEF pump.
4. Frozen DEF (heating doesn’t work).
5. Clogged DEF tank breather.
6. Leakage in DEF suction hose.
7. Low DEF tank level.
8. Clogged filter in DEF pump unit.
9. Clogged DEF hose.
10. Clogged DEF tank strainer.
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SERVICE MANUAL 3000 AND 4000 SERIES GEN 4 GENERATION – ALLISON
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