Diesel particulate filter (DPF)
P242F, P2463 and P2458: ash, soot and regeneration
These three codes are related, but answer different questions: P242F names ash, P2463 names soot and P2458 concerns the duration of a regeneration.
At a glance
What the codes tell you
- P242F
- Particulate filter restriction—ash accumulation.
- P2463
- Particulate filter restriction—soot accumulation.
- P2458
- Particulate filter regeneration duration.
How the entries differ
- P242F attributes the restriction to ash accumulation.
- P2463 attributes the restriction to soot accumulation.
- P2458 assesses particulate-filter regeneration duration; it is not a loading value.
What is not yet established
- Soot and ash are diagnostically different and cannot both be inferred from a single number.
- An abnormal regeneration duration does not establish why the process did not run as expected.
- The code describes the control unit’s assessment. It determines neither which component needs replacing nor the repair required.
- Manufacturer-specific descriptions, status, freeze-frame data and live readings can materially change the interpretation.
Diagnostic information that helps next
A reliable assessment does not consider the code in isolation. The following information turns a number into a fault condition that can be investigated:
- Calculated soot and ash values, with units and originating control unit
- Regeneration status, history and interruption conditions
- Differential pressure at defined engine speeds and loads
- Engine oil level, driving pattern and relevant accompanying faults
More codes for this system
Frequently asked questions about P242F, P2463, P2458
What do fault codes P242F, P2463, P2458 mean?
P242F: Particulate filter restriction—ash accumulation. P2463: Particulate filter restriction—soot accumulation. P2458: Particulate filter regeneration duration.
Which component needs replacing for P242F?
The code does not determine that. The full diagnostic description, fault status, freeze-frame data, live readings and vehicle-specific system checks determine the appropriate repair.
What information helps with diagnosis?
Useful information includes Calculated soot and ash values, with units and originating control unit, Regeneration status, history and interruption conditions, Differential pressure at defined engine speeds and loads, Engine oil level, driving pattern and relevant accompanying faults.
Traceable sources
Sources and scope
The descriptions are our own factual explanations of standardised generic OBD definitions. Manufacturer-specific P1xxx codes and differing manufacturer descriptions are not given blanket interpretations here.