DPF Differential Pressure - High

Caterpillar Heavy Equipment Warning Exhaust

Model: Caterpillar C9 Engine | Code: SPN 3055-FMI 1

Applicable Systems

EMCP 4.2

Symptoms

DPF restriction warning; engine derate active; soot loading above regeneration threshold.

Step 1: Check DPF soot loading via Cat ET
Soot loading < 100% before regen needed
Step 2: Initiate stationary DPF regeneration via Cat ET
Regen completes, soot load < 30%
Step 3: Inspect DPF differential pressure sensor
Sensor reading matches mechanical gauge
Step 4: Check exhaust system for leaks before DPF
No exhaust leaks found
Step 5: Clear code and verify DPF pressure within spec
DPF diff pressure < 3 kPa at idle

Clear via Cat ET after successful DPF regeneration.

Q: How often should DPF regeneration occur?
Active regen typically every 50-100 hours depending on load cycle. Stationary regen when soot load reaches threshold.