Powertrain, generic (extended)

P249F Excessive Time To Enter Closed Loop Particulate Filter Regeneration Control

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

During an active filter regeneration the controller is meant to steer the temperature ahead of the particulate filter with feedback from the exhaust temperature sensors, usually by adjusting late fuel injection or a hydrocarbon dosing valve in the exhaust. P249F is stored when the regeneration spent too little of its duration in that feedback mode. Ford's 2023 diesel summary judges the closed-loop share against a threshold that depends on total regeneration time, checked once per regeneration at 1000 to 3500 rpm. Volvo truck bulletin K86412082 (model years 2016 to 2018) pairs P249F with P24A0 on engines with a seventh, aftertreatment hydrocarbon injector and points first to engine and aftertreatment software. P24A0 and P24A1 cover a loop that runs but saturates. The driver normally notices only the lamp.

Likely causes

Engine or aftertreatment module software needing an update
Exhaust temperature sensor ahead of the oxidation catalyst or filter reading wrongly
Hydrocarbon dosing valve in the exhaust restricted or slow to respond
Regenerations repeatedly interrupted by short trips or changing load

Symptoms

  • Malfunction indicator lamp on
  • Regeneration may take longer or repeat more often
  • Often no change in driveability

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–800
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dpf b1exhaust gas temperature sensor b1

Related codes

P24A0P24A1P244CP244D

References: fordservicecontent.com, static.nhtsa.gov, law.cornell.edu.