Active DPF Differential Pressure Sensor Out of Range
DPF pressure difference sensor signal is outside normal operating range.
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What it means (plain English)
The differential pressure sensor measures the difference in pressure before and after the diesel particulate filter (DPF). If this reading is too high or too low, it indicates a problem with the DPF or the sensor itself.
What the computer is actually seeing
The engine control module (ECM) expects the DPF pressure differential to be within a range of approximately 1 to 5 inches of water column. When the values are outside this range, it triggers the fault code SPN 5350.
What a healthy reading looks like
1 - 5 inches of water column for normal DPF operation, ideally around 2-3 inches at idle.
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 differential pressure sensor wiring and connectors for damage or corrosion. Decision: If intact, proceed to step 2; if damaged, repair or replace as necessary.
- 22. Check the DPF for visual signs of blockage or damage. Decision: If clear, proceed to step 3; if blocked, replace or clean DPF as appropriate.
- 33. Measure the differential pressure across the DPF using a scan tool or manometer. Decision: If within expected range (1-5 inches), replace the differential pressure sensor; if out of range, replace or clean the DPF as appropriate.
Common causes
- Clogged diesel particulate filter (DPF)
- Faulty differential pressure sensor
- Damaged or pinched wiring harness to the sensor
- Exhaust leaks before or after the sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but monitor for loss of power. The DPF might be reducing efficiency, leading to potential engine issues.
Will this code come back after clearing?
If the issue isn't fixed, yes, it will return once the ECM detects the same problem again.
Why does this code sometimes pair with SPN 5351?
SPN 5351 indicates low differential pressure, a related issue often seen if the DPF is partially clogged.
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