Ram 6.7L Cummins Repair
The 6.7L Cummins carries the same reputation for durability as the 5.9L while adding a variable geometry turbo and a full emissions system. Most of our work on these trucks involves emissions components, fuel system service and the effects of heavy towing. We service 6.7L Cummins trucks throughout the Phoenix metro.
Common applications
- Ram 2500 and 3500 pickups
- Ram 4500 and 5500 chassis cabs
- Commercial and fleet diesel applications
Known problems and symptoms
Soot accumulation and cooler failure are among the most common emissions-side repairs on this engine.
Short-trip use and upstream engine faults both lead to incomplete regeneration and eventual filter restriction.
The variable geometry turbo can stick from soot buildup, producing low power or boost-related codes.
Injector and pump condition affect starting, smoke and power. Contamination expands the repair scope.
Cooling system condition is critical for trucks that tow in Arizona heat.
How we diagnose it
- Scan-tool review including aftertreatment and regeneration data
- Turbo actuator and vane function testing
- Fuel rail pressure and injector return testing
- Cooling system pressure testing and fan operation check
- Exhaust backpressure measurement
Repair options
- EGR cooler and valve replacement
- DPF service or replacement to factory configuration
- Turbocharger service or replacement
- Fuel system repair including injector replacement
- Cooling system repair suited to heavy towing
Repair topics for this engine
Diagnosing fuel, turbo, emissions and cooling faults on the 6.7L Cummins.
Diagnosing sticking VGT turbos and actuator faults on the 6.7L Cummins.
Lawful diagnosis and repair of DPF, EGR, DEF/SCR and NOx sensors on the 6.7L Cummins.
Common-rail injector testing and replacement on the 6.7L Cummins.
Lift pump, high-pressure pump and contamination diagnosis for the 6.7L Cummins.
Cooling and EGR cooler repairs for the 6.7L Cummins in Phoenix heat.
Grid heater, fuel supply and sensor testing for 6.7L Cummins starting problems.
Overhaul or replacement options for 6.7L Cummins engines.
Trucks with this engine
Verified applications with their own pages. Where a year had more than one engine, each page explains how to confirm yours.
Frequently asked questions
Why does my Cummins keep regenerating?
Usually because something is adding soot or preventing a complete regeneration cycle — a sticking turbo, EGR fault, sensor problem or a driving pattern that never allows completion.
Do you work on the 68RFE behind this engine?
Yes. The 68RFE is one of the heavy-duty transmissions we diagnose and rebuild most often.