P24A0Closed Loop Particulate Filter Regeneration Control At Limit - Temperature Too Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P24A0 means the regeneration temperature loop is already giving all the extra heat it may, yet the gas ahead of the particulate filter stays below target. GM describes it as an HC injector control deviation: the gap between setpoint and measured temperature ahead of the DPF is watched while the filter warms up, and 10 failing out of 20 samples set a Type B fault; the 2014 table phrases it as insufficient hydrocarbon injector authority. Ford's 2023 summary uses P24A0 when the controller sits at a clip and the temperature error stays large long enough. Volvo truck bulletin K86412082 lists it with P249F. Likely culprits are a restricted HC doser or fuel supply, an aged oxidation catalyst that lights off poorly, or a faulty temperature sensor. Soot may build up because regenerations stay incomplete.
- What you may notice
- Malfunction indicator lamp on
- Regenerations take long or do not finish
- Soot load codes may follow
- Likely causes
- LikelyHydrocarbon dosing valve or its fuel supply restricted
- PossibleOxidation catalyst aged or face-plugged, so the fuel does not burn ahead of the filter
- PossibleExhaust temperature sensor reading too low
- RareExhaust leak ahead of the sensors cooling the gas
- 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: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.