Isuzu documents a DPF and, on later U.S. models, DEF/SCR. Hino documents a system that uses diesel fuel rather than DEF to reduce NOx on some engines. Both need DPF regeneration. Per Isuzu and Hino.
Common to all diesels
These apply to Isuzu / Hino engines too.
- Hard start when cold
- Cranks, will not start
- White smoke
- Black smoke
- Blue smoke
- Low power / limp mode
- Rough idle
- Water in fuel light
- Fuel in the oil
- Losing coolant
- DPF and regeneration
- Cold-weather gelling
- DEF / SCR faults
- NOx sensor problems
- Clogged EGR valve
- Turbo whistle / boost leak
- Injector knock
- Glow plug / grid heater failure
- Fuel filter restriction
- Air in the fuel
- Oil consumption
- Crankcase blow-by
- Cavitation / liner pitting
- Maintenance basics
- Winter diesel prep
- Buying a used diesel
- Is a DPF/EGR delete legal?
Where this comes from
Last reviewed 2026-10-19. General information only: confirm with your service information and a qualified diesel technician.