P249FExcessive Time To Enter Closed Loop Particulate Filter Regeneration Control
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp on
- Regeneration may take longer or repeat more often
- Often no change in driveability
- Likely causes
- LikelyEngine or aftertreatment module software needing an update
- PossibleExhaust temperature sensor ahead of the oxidation catalyst or filter reading wrongly
- PossibleHydrocarbon dosing valve in the exhaust restricted or slow to respond
- RareRegenerations repeatedly interrupted by short trips or changing load
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.