DTC code
P246C
Diesel Particulate Filter Ash Accumulation
No mechanic has confirmed a fix for this code yet.
Read the cases — confirm what worked for youTechnical guide
reference — not individually verifiedSymptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Probable causes
high: DPF heavily clogged
Diagnostic steps
Check the components involved: dpf b1. Verify wiring and connectors before replacing any part. Job difficulty: hard (workshop equipment required). Typical European range — 200-3500 EUR, 1-8 h. Reference values only.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
MECCANIC — code interpretation
not a diagnosisCode P246C indicates excessive ash accumulation within the Diesel Particulate Filter system that prevents successful forced regeneration cycles. Unlike soot, which is combusted during standard or active regenerations, inorganic ash remains trapped after reaching its combustion limit and must be physically removed via professional cleaning procedures. Mechanics should focus inspection efforts on the DPF substrate integrity, monitoring for pressure differentials that suggest blockage beyond normal operating parameters. While specific service intervals vary by manufacturer documentation, this condition typically signals a need to evaluate filter replacement criteria or perform an ash extraction process rather than relying solely on software resets. Proper diagnosis requires verifying fuel quality and engine oil specifications, as contaminants from these sources can accelerate the rate of irreversible particulate buildup within the filtration media.
sources (2)
- [sae] SAE J2012 — Diesel Particulate Filter Ash Accumulation
- [case] Skoda Octavia III (solved)
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.