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Volvo engine code DTC P249D
NOx Catalyst: Feedback: Slow/Fails to Enter: Default CL This diagnostic function indicates if the DEF feedback control is saturated against a high or low limit. The logic for this diagnostic evaluates the time spent at saturation and compares the ratio between the time spent in a saturation mode and the total time with the engine running. A fault is reported whenever the ratio exceeds a fault limit. P249D NOx Catalyst: Feedback Control (Saturated Low Monitor) DTC P249D Component / System NOx Catalyst - Feedback Control (Saturated Low Monitor) Monitor Strategy Description Evaluates the time spent in Saturation Low Mode Fault Limit Time spent saturated low > 240 seconds Enable Conditions • Engine Speed > 500 RPM • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C Disable Conditions N/A Time Required For DTC To Be Set 300 seconds MIL Illumination 2 Drive Cycles