Volvo All Engines (2013 Emissions) Fault Code: P249C00 PID: EMS Excessive Time to Enter Closed Loop Reductant Injectile Control

When the aftertreatment selective catalytic reduction (SCR) system operates under normal conditions, the aftertreatment control module (ACM) monitors diesel exhaust fluid (DEF) dosing valve duty cycle and DEF pump control value. When the DEF dosing valve duty cycle increases above allowed threshold and the DEF pump control value decreases below expected threshold, the ACM stops DEF dosing and reports a fault. The fault might be indication of electrical failure or blockage in DEF dosing valve or DEF supply line from the DEF tank.

Conditions for diagnostic trouble code (DTC):
1) Average exhaust gas temperature below threshold

Probable cause
1) Exhaust leakage between Engine and Exhaust Aftertreatment System
2) Exhaust Gas Temperature

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