P2464
Diesel Particulate Filter Restriction - Ash AccumulationP2464 is a generic OBD-II powertrain diagnostic trouble code: Diesel Particulate Filter Restriction - Ash Accumulation. 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 P2464 means
P2464 is stored when the PCM or diesel aftertreatment controller determines that the diesel particulate filter (DPF) restriction is beyond acceptable limits due to non-combustible ash accumulation. Unlike soot, which can be burned off during active or passive regeneration, ash is the incombustible residue from engine oil additives and cannot be removed by heat. Over time ash accumulates in the filter cells and permanently increases restriction.
The control module infers DPF loading by monitoring the differential pressure across the filter and correlating it with exhaust flow rate. When pressure drop indicates restriction beyond the ash accumulation threshold, P2464 is logged. This threshold is separate from the soot loading threshold (which triggers regeneration) and indicates that the filter has reached end of service life for its ash capacity.
The typical remedy is physical removal and professional cleaning of the DPF using pneumatic pulse or aqueous washing equipment, or replacement if cleaning is not feasible. After service, the DPF ash accumulation counter stored in the PCM or aftertreatment module must be reset using an appropriate scan tool, or the code will return immediately. Using low-ash engine oil is the primary preventive measure.
Common causes
Most-frequently reported root causes when P2464 is logged.
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1
End-of-life ash accumulation from normal long-term operation requiring service or replacement.
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2
Use of conventional high-ash engine oil instead of the specified low-SAPS oil accelerating ash buildup.
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3
Excessive oil consumption due to worn piston rings or valve seals increasing ash input to the DPF.
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4
Frequent short-trip driving preventing effective passive regeneration and compacting soot/ash layers.
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5
DPF differential pressure sensor malfunction producing a falsely high restriction reading.
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6
Blocked differential pressure sensor hoses giving incorrect data to the control module.
Symptoms drivers notice
How to diagnose P2464
A typical diagnostic flow when this code is present.
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1
Record all DTCs and check freeze-frame for DPF differential pressure and exhaust flow data.
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2
Inspect the differential pressure sensor and its hoses for blockage or damage before condemning the DPF.
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3
Check the DPF ash accumulation counter in the aftertreatment module using a capable scan tool.
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4
Review vehicle service history for oil type used; confirm low-SAPS specification oil has been used.
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5
If ash counter confirms end-of-life, remove the DPF and have it professionally cleaned or replace it.
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6
After cleaning or replacement, reset the DPF ash accumulation counter and the DPF soot model.
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7
Verify differential pressure drops to normal levels after service and confirm no recurrence.
Vehicles where we've handled P2464
Platforms in our catalogue with confirmed P2464 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
Can DPF ash accumulation be reversed by regeneration?
No. Regeneration burns off soot but cannot remove ash; ash requires physical cleaning or filter replacement.
How long does a DPF last before ash cleaning is needed?
Service intervals vary widely by vehicle, oil type, and duty cycle, but professional cleaning is typically required every 100,000 to 200,000 km depending on manufacturer guidance.
What oil should I use to minimize ash accumulation?
Always use the engine oil grade and ACEA specification listed in the owner's manual; most modern diesel engines with DPF require low-SAPS (low sulfated ash, phosphorus, sulfur) oil.
Will P2464 clear itself after cleaning?
No. The ash accumulation counter must be reset with a compatible scan tool after cleaning; without a reset the code will return immediately even with a clean filter.
Disabling P2464 in software
RaceTune can permanently disable P2464 — 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.
ECU families we can disable P2464 on
We hold the DaVinci A2L disable definitions for these families, so the exact P2464 path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.
- Bosch EDC17C50 verified
- Bosch EDC17C56 verified
- Bosch EDC17CP09 verified
- Bosch MD1CP002 verified
- Bosch MD1CS001 verified
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 P2464 in your scan?
Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.
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