DPF Differential Pressure High
Indicates high differential pressure across 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 collects soot from the engine, and if it can't breathe properly (high pressure), it means it's probably clogged or blocked.
What the computer is actually seeing
The Engine Control Unit reads the pressure difference between the DPF inlet and outlet. A reading above a certain threshold (usually around 3.0 inches of water or more) triggers this code.
What a healthy reading looks like
Expected pressure differential across a clean DPF is less than 2.5 inches of water.
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 DPF for visible signs of soot buildup or damage. Decision: If damaged, replace DPF. If no damage, proceed to step 2.
- 22. Inspect the differential pressure sensor and wiring for faults or disconnections. Decision: If damaged, repair/replace wiring or connector. If wiring is okay, proceed to step 3.
- 33. Check exhaust for leaks before and after the DPF. Decision: If a leak is found, repair it. If no leaks, proceed to step 4.
- 44. Perform a forced regeneration of the DPF. After completion, monitor differential pressure readings for stability. Decision: If pressure normalizes, the issue was likely a failed regeneration, if not, proceed to step 5.
- 55. Measure the pressure differential with a manometer to check actual values. Decision: If reading is still high, DPF is likely contaminated and needs to be replaced.
Common causes
- Clogged DPF
- Faulty pressure sensor
- Exhaust leaks
- Faulty wiring or connectors
- Improper regenerations
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Driving with high DPF pressure can lead to engine damage; it's best to address it immediately.
Will this code clear on its own?
Clearing may happen after fixing the issue, but the code won’t clear without addressing the root cause.
Why is this code paired with engine performance issues?
High DPF pressure restricts exhaust flow, affecting engine performance and efficiency.
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