Recipe - Cummins 6.7L ISB Diesel (Ram HD)

Specific Fix build

Reliability tier: aggregated - verify before ordering, see /disclosure/

Aftertreatment repair for the 6.7 ISB (modes DPF clogging / regeneration problems / DEF / SCR system failures (2013-2018)): city-duty short trips load the DPF and abort regens; DEF hardware faults countdown-derate the truck. The OEM DPF assembly has no verified listing as of 2026-09-28 (honest data gap - cleaning services are the practical path); DEF subsystem parts carry the same gap, so this recipe leans on verified sensors/cooling hardware and the era-correct EGR chain next door.

Parts

6.7 Cummins DPF Assembly - DPF assembly record - no verified OEM listing as of 2026-09-28; cleaning service is the practical route (disclosed gap) (qty 1)
DEF Pump Assembly with Heater (2013-2018) - DEF pump record - same disclosed gap; confirm by VIN before ordering (qty 1)
DEF Dosing Injector (2013-2018 SCR) - DEF dosing injector record (verify listing at order) (qty 1)
NOx Sensor (2013-2018 SCR) - NOx sensor record (verify listing at order) (qty 1)
DEF Fluid (2.5gal case, dated stock) - fresh sealed ISO 22241 fluid - the zero-cost fix for quality faults (qty 1)

Install order

separate the complaint: regen/soot story vs DEF countdown story
DEF quality faults: fresh fluid first, then dosing hardware
DPF: force regen, assess ash load, cleaning service before assembly shopping
NOx sensors where SCR-side codes point

Expected outcome

Regens complete, DEF countdown cleared, no derates.

Do not

do not buy an unverified 'compatible' DPF for this platform - the OEM record carries a disclosed gap for a reason

DIY or shop: Shop: aftertreatment and DEF verification procedures.