Manufacturer Specific Fault Code for Diesel Particulate Filter (DPF) Derate
This code indicates a DPF derate condition due to high soot levels.
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 computer detected that the soot level in the DPF is too high, which can cause the engine to limit power to protect itself and keep emissions in check.
What the computer is actually seeing
The vehicle's engine control module (ECM) monitors DPF pressure differential and soot load. If the soot reaches a critical level (commonly above 45-50%), it triggers this code and provides a derate condition.
What a healthy reading looks like
Normal DPF pressure differential should be less than 5 inches of water column at idle and soot load should be below 20%.
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 connectors for damage or corrosion. Repair if needed. Decision: Is the connector okay? Yes: Go to step 2. No: Repair/reconnect and retest.
Common causes
- Clogged DPF filter
- Faulty DPF pressure sensors
- Exhaust leaks
- Improper regeneration cycles
- Faulty fuel injectors leading to excessive soot production
Typical repair cost
$$ (300-1500 depending on DPF service or replacement)
Related codes
Frequently asked questions
Is it safe to drive with this code?
Not recommended. High soot levels can cause reduced power and increased emissions.
Will this code return after clearing?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does this code sometimes pair with other codes?
It often indicates correlated issues such as high soot and regeneration failure or sensor malfunctions.
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