Active DPF Pressure Sensor Fault
This code indicates a problem with the Diesel Particulate Filter pressure sensor.
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 is detecting that the pressure sensor for the DPF isn't working right, usually showing too high or too low of a pressure reading.
What the computer is actually seeing
The ECM monitors the DPF pressure sensor's voltage output; normal operation should show a pressure relative to the exhaust flow. For example, a proper voltage range would be between 0.5V (low pressure) to 4.5V (high pressure) depending on the engine state.
What a healthy reading looks like
Normal DPF pressure should be near 0.5V at low exhaust conditions and peak around 4.5V during regeneration. Always check the specific vehicle's service manual for exact values.
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 wiring and connectors at the DPF pressure sensor. Look for signs of damage or corrosion. Any issues found? -> Repair or replace the wiring/connectors.
- 22. Measure the voltage output at the DPF pressure sensor using a multimeter. Is it within the expected range (0.5V to 4.5V)? -> If not, proceed to step 3; if yes, the sensor or ECM might be faulty and needs further investigation.
- 33. Remove the DPF pressure sensor and inspect it for blockage or carbon build-up. Is it clean? -> If dirty, clean or replace the sensor; if clean, proceed to step 4.
- 44. Check for excessive back pressure in the DPF itself. Perform a DPF regeneration cycle and check vehicle performance. Is the pressure normal after regeneration? -> If it increases, consider replacing the DPF.
Common causes
- Wiring issues or connector problems to the DPF pressure sensor.
- Faulty DPF pressure sensor.
- Clogged DPF causing incorrect pressure readings.
- ECM software issues.
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it’s best to fix it soon; however, it may be drivable for a short time.
Will this code come back after clearing?
If the underlying issue isn't addressed, it will typically return after a short period of operation.
Why do I see this code with SPN 5802?
SPN 5802 also relates to the DPF and typically indicates a different issue with DPF health, often making them related.
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