DPF Soot Accumulation
Indicates a problem with soot accumulation in the Diesel Particulate Filter (DPF).
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 DPF is getting clogged up with soot from the diesel engine, which can lead to reduced performance and increased emissions.
What the computer is actually seeing
The engine control module (ECM) monitors DPF pressure; during a normal regeneration cycle, the pressure difference across the DPF should be between 0.5 to 3.0 kPa. If the pressure is higher than expected, it flags this code.
What a healthy reading looks like
Normal DPF pressure readings during regeneration should be below 3.0 kPa. If readings are above this threshold or if regeneration is unsuccessful, the ECM sets the code.
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. Inspect the DPF for visible damage or soot accumulation. If damaged, replace the DPF. Decision: If no damage, proceed to Step 2.
- 22. Check the DPF pressure sensor wiring and connector for any signs of corrosion or damage. Repair if necessary. Decision: If wiring is fine, proceed to Step 3.
- 33. Verify the condition of the diesel fuel and use a fuel quality test kit. Replace with higher quality if poor quality is detected. Decision: If fuel is okay, proceed to Step 4.
- 44. Perform a forced regeneration using a scan tool. Monitor DPF pressure readings during this process. Decision: If regeneration is successful and pressure returns to normal, code is cleared. If not, replace the DPF pressure sensor.
Common causes
- Clogged DPF
- Faulty DPF pressure sensor
- Failed regeneration cycles
- Excessive idling or short trips
- Low-quality diesel fuel
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's driveable but you may experience reduced power and increased emissions. Fix it soon.
Will this code come back after repair?
If the root cause is fixed, the code should not return.
Why does this error pair with other codes?
Multiple codes may indicate a system-wide issue like DPF clogging affecting pressure readings.
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