The 6.7L Power Stroke uses a diesel particulate filter (DPF) to trap soot, and it periodically burns that soot off in a process called regeneration. Understanding regen helps you keep the system healthy and recognize when something is wrong.
Passive versus active regen
Passive regeneration happens on its own during sustained highway driving, when exhaust temperatures are high enough to burn soot continuously. Active regeneration is commanded by the computer when soot builds up, injecting extra fuel to raise exhaust temperature and clean the filter. You may notice a change in idle, a hot exhaust smell, or higher idle speed during an active regen.
Why short trips cause trouble
Trucks that only see short, low-speed trips never get hot enough for passive regen and may interrupt active regens before they finish. Soot accumulates, regens become more frequent, and fuel economy drops. Letting an active regen complete is important; repeatedly shutting the truck off mid-regen leads to a clogged filter.
Warning signs
- Frequent active regens and dropping fuel economy
- A DPF or exhaust-filter warning message
- Reduced power or a derate as the filter loads
- Regens that never seem to finish
Keeping the DPF healthy
Give the truck regular highway runs, let active regens complete, and keep the EGR and sensors working correctly, since faults there disrupt regeneration. If the filter becomes heavily clogged it may require a forced regen or cleaning. Healthy upstream components keep the DPF doing its job with minimal fuss.
Frequently asked questions
What is active regeneration?
The computer injects extra fuel to raise exhaust temperature and burn soot out of the DPF when it detects the filter is loading up.
Why does my 6.7L regen so often?
Short trips, a faulty sensor, or EGR problems prevent complete regens and cause soot buildup, triggering frequent active regens.
Can I shut off during a regen?
Try to let it finish. Repeatedly interrupting active regens leads to a clogged filter and eventual derate.
Need the part?
We stock the parts these trucks need. Shop all 6.7L Power Stroke parts →