What are the common causes of P249F?

A DPF soot load that keeps regeneration out of closed loop. A failed DPF pressure or temperature sensor. A DPF that is not installed correctly. A calibration issue in the DPF control software.

Read DPF soot load and regeneration status on a scan tool. Check the DPF pressure and temperature sensors for faults. Run a forced regeneration and watch the closed loop engage. Check that the DPF is installed and sealed correctly. Reprogram the DPF control if the sensors test good. Clear the code and retest.

P249F

Excessive Time To Enter Closed Loop Particulate Filter Regeneration Control

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P249F means Excessive Time To Enter Closed Loop Particulate Filter Regeneration Control.

Check these first

A DPF soot load that keeps regeneration out of closed loop
A failed DPF pressure or temperature sensor
A DPF that is not installed correctly
A calibration issue in the DPF control software

What to do next

Read DPF soot load and regeneration status on a scan tool
Check the DPF pressure and temperature sensors for faults
Run a forced regeneration and watch the closed loop engage
Check that the DPF is installed and sealed correctly
Reprogram the DPF control if the sensors test good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.