DPF Pressure Differential Sensor Range/Performance Problem
The diesel particulate filter pressure differential sensor is not performing as expected.
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What it means (plain English)
The computer uses a pressure sensor to check if the DPF is clogged. If the differences in pressure aren't what they should be, it means the flow isn't right, which often indicates a blocked filter.
What the computer is actually seeing
The engine control module monitors the pressure before and after the DPF to ensure it can differentiate between normal and excessive blockage. It expects a certain range of pressure readings under various conditions to confirm proper exhaust flow.
What a healthy reading looks like
Typically, the pressure differential should not exceed 2-3 psi under normal operation; anything significantly higher indicates obstruction.
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 sensor wiring and connectors for corrosion or damage. Repair or replace if necessary.
- 22. Inspect the DPF for visible signs of clogging or damage (cracks, soot buildup). If dirty, attempt a regeneration or cleaning process.
- 33. Measure the pressure differential using a scan tool or gauge. If readings exceed expected values (2-3 psi), the DPF is likely blocked.
- 44. If the DPF is clear, replace the pressure differential sensor. Check and test operation after replacement.
Common causes
- Blocked or clogged DPF
- Faulty pressure differential sensor
- Wiring issues in sensor circuit
- Excessive soot accumulation
- Exhaust leaks upstream or downstream of DPF
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code?
It's drivable but fix it soon; a clogged DPF can lead to reduced performance or failure to regenerate.
Will this code come back after clearing?
If the problem isn't fixed, it will likely return after a few drive cycles.
Why does this code appear with reduced power or warning lights?
Because it's tied to DPF performance, the vehicle may enter limp mode to prevent engine damage due to excessive blockage.
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