P24C0
Particulate Filter Restriction - Forced Regeneration RequiredP24C0 is a generic OBD-II powertrain diagnostic trouble code: Particulate Filter Restriction - Forced Regeneration Required. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P24C0 means
P24C0 is set when the ECM determines that the diesel particulate filter soot loading has reached a critical level that requires a forced regeneration to be performed. At this stage, normal passive and active regeneration strategies have been insufficient or have not been completed, and the soot level has reached a threshold where continued operation without regeneration risks DPF damage or engine performance reduction.
The ECM may initiate a reduced power or limp mode strategy at this soot loading level to protect the DPF from thermal damage caused by an uncontrolled regeneration event. The filter must be regenerated before normal engine power is restored. In severe cases where the soot level is very high, a workshop-level forced regeneration using a scan tool may be the only safe option, as a full regeneration in this condition generates extreme exhaust temperatures.
Underlying causes that prevented earlier regeneration from completing must also be identified and corrected, otherwise the DPF will re-accumulate soot rapidly after the forced regeneration. Common contributors include habitual short-trip driving, EGR system faults, exhaust temperature sensor faults, and fuel system issues affecting post-injection for active regeneration.
Common causes
Most-frequently reported root causes when P24C0 is logged.
-
1
Repeated failure of active DPF regeneration due to insufficient exhaust temperatures from short-trip or low-load driving.
-
2
DPF pressure differential sensor fault causing the ECM to miss early soot accumulation warnings.
-
3
Faulty exhaust temperature sensor providing incorrect temperature feedback and aborting regeneration prematurely.
-
4
EGR valve fault leading to elevated soot production and accelerated DPF loading.
-
5
Blocked or failed DPF regeneration fuel injector or dosing system preventing active regeneration.
-
6
Fuel system issue affecting post-injection calibration required for active regeneration.
-
7
Driver override of earlier DPF warning lights preventing timely regeneration at lower soot levels.
Symptoms drivers notice
How to diagnose P24C0
A typical diagnostic flow when this code is present.
-
1
Connect a scan tool and record all DTCs including any exhaust temperature, EGR, or fuel system codes alongside P24C0.
-
2
Check DPF soot load percentage in live data to confirm the extent of accumulation.
-
3
Review regeneration history data to understand how long regeneration has been failing or incomplete.
-
4
Inspect exhaust temperature sensor readings at all positions for plausible values before attempting regeneration.
-
5
Perform a forced DPF regeneration using the scan tool in a safe, ventilated area with the engine at full operating temperature.
-
6
Monitor exhaust temperatures during the forced regeneration to ensure they remain within safe limits.
-
7
After successful regeneration, diagnose and repair the root cause that prevented earlier regeneration to avoid recurrence.
Vehicles where we've handled P24C0
Platforms in our catalogue with confirmed P24C0 coverage.
Related powertrain codes
- P2400 — Evaporative Emission System Leak Detection Pump Control Circuit/Open
- P2401 — Evaporative Emission System Leak Detection Pump Control Circuit Low
- P2402 — Evaporative Emission System Leak Detection Pump Control Circuit High
- P2404 — EVAP Leak Detection Pump Sense Circuit: Implausible Signal
- P2405 — Evaporative Emission System Leak Detection Pump Sense Circuit Low
- P2407 — Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic
Frequently asked questions
Is it safe to attempt a forced regeneration at maximum soot load?
A forced regeneration at very high soot loads generates extreme exhaust temperatures and should only be performed in a safe, well-ventilated area away from flammable materials, by a technician monitoring temperatures throughout.
Can P24C0 cause permanent DPF damage?
If the vehicle is driven extensively at maximum soot load, a high-temperature uncontrolled regeneration event can melt or crack the DPF substrate. Early intervention is important.
Why did my vehicle not warn me earlier before reaching this stage?
Earlier DPF warning lights (yellow or amber indicators) would typically have been active before P24C0 was set. If these were ignored or the fault progression was rapid, P24C0 may appear without a long warning period.
After a forced regeneration, will P24C0 clear automatically?
Once a successful forced regeneration completes and the soot load drops to an acceptable level, the ECM should clear the fault on the next drive cycle. A scan tool may be needed to reset the regeneration counter and confirm the fault is resolved.
Disabling P24C0 in software
RaceTune can permanently disable P24C0 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
ECUs with a P24C0 disable in our catalogue
Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.
- Bosch EDC17C50 verified 1 software version
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
Got P24C0 in your scan?
Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.
Upload your file