Diesel Particulate Filter Soot Accumulation
Indicates the diesel particulate filter (DPF) has excessive soot accumulation.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The diesel particulate filter is getting plugged up with soot, blocking exhaust flow and causing performance issues.
What the computer is actually seeing
The engine control module (ECM) monitors the pressure difference across the DPF. When the soot level reaches a threshold, the DPF is deemed too full.
What a healthy reading looks like
Normal pressure differential should be less than 5 inches of water; warning triggers above 10 inches.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the DPF pressure sensor connections and wiring for damage or corrosion. Decision: If damaged, repair it; if good, proceed to step 2.
- 22. Inspect the DPF for any visible blockages or damage. Decision: If any are found, replace the DPF; if not, proceed to step 3.
- 33. Verify proper operation of the engine and exhaust systems (e.g., check for leaks or faulty EGR system). Decision: Repair any issues found; if all systems are good, proceed to step 4.
- 44. Initiate a forced regeneration cycle per manufacturer specifications. Monitor DPF temperatures and pressure. Decision: If regeneration fails, further inspect the EGR and injector functions; if it succeeds, clear codes and perform a road test.
Common causes
- Clogged DPF due to excessive regeneration issues
- Faulty pressure sensors
- Short trips preventing proper DPF regen cycles
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not safe; driving will lead to reduced engine performance and may damage the DPF.
Will this code come back after erasing?
Yes, if the underlying issue isn't fixed, the code will reappear.
Why does this code appear with low fuel mileage?
High soot accumulation can affect exhaust flow, leading to less efficient combustion and lower fuel mileage.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →