Soot Accumulation Rate Too High
Indicates excessive soot accumulation in the diesel particulate filter.
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)
Your diesel engine's filter is getting plugged up with soot faster than normal, which can cause poor performance and higher emissions.
What the computer is actually seeing
The engine control module (ECM) is monitoring the soot levels in the diesel particulate filter (DPF). If the soot rate exceeds a set threshold, typically above 45 grams per hour during regeneration or normal operation, it triggers this fault.
What a healthy reading looks like
Soot accumulation rate should be below 45 grams/hour under normal conditions during engine operation or DPF regeneration.
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 severe soot buildup — if it's clogged, this could be the cause. Proceed to step 3.
- 22. Check EGR operation — ensure it's functioning correctly by measuring EGR valve position and exhaust flow. If faulty, replace the EGR and retest.
- 33. Check engine oil level and condition — if oil smells excessively like fuel, perform an oil change and check for leaks.
- 44. Ensure that the vehicle is being used for longer trips to allow complete DPF regeneration. If driving style is an issue, no parts need replacement.
Common causes
- Clogged DPF
- Faulty EGR system
- Oil dilution in fuel
- Frequent short trips (not allowing DPF regeneration)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's best to address this code quickly, as excessive soot can impact engine performance and emissions, though it's usually drivable for short distances.
Will this fault come back after fixing?
If the root cause (like a faulty EGR or clogged DPF) isn't resolved, it’s likely the code will return.
Why does this code sometimes pair with others?
It often appears with EGR faults or other DPF-related codes, as they can contribute to the same soot accumulation problem.
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