The 6.7L Cummins has powered the Ram 2500, 3500, 4500, and 5500 trucks since 2007.5, replacing the legendary 5.9L. It brought more horsepower, torque, and emissions controls — but it also introduced new challenges for owners.
From DPF/EGR issues in the early years to CP4 fuel pump failures in 2019–2020 and cam/lifter problems in 2019+ models, each generation has its own set of common failures.
At DK Auto & Diesel Service in Magnolia, TX, we repair and upgrade every version of the 6.7 Cummins for towing, performance, and work truck reliability.
6.7 Cummins by Generation
2007.5–2009 6.7 Cummins Problems & Fixes
• First 6.7 trucks with EGR & DPF
• Common issues: frequent regens, turbo actuator failures, head gasket problems
2010–2012 6.7 Cummins Problems & Fixes
• Improved regen system, but emissions issues persist
• Common issues: EGR cooler failures, turbo vane actuator, injector wear
2013–2018 6.7 Cummins Problems & Fixes
• Added DEF/SCR system, still used reliable CP3 pump
• Common issues: DEF heater failures, NOx sensors, turbo actuator, injectors
2019–2020 6.7 Cummins Problems & Fixes
• Higher output, but plagued by CP4 fuel pump failures
• Common issues: CP4 pump destruction, full fuel system contamination, cam & lifter failures, turbo actuator issues
2021–Present 6.7 Cummins Problems & Fixes
• Returned to CP3 pump, more reliable overall
• Common issues: camshaft & lifter failures, DEF/NOx sensor problems, turbo actuator issues
How DK Auto & Diesel Helps 6.7L Cummins Owners
- Fuel system diagnostics (CP3/CP4 repairs, injector testing)
- Emissions system service (EGR/DPF/DEF/NOx)
- Camshaft & lifter replacements (2019+ ticking problems)
- Turbo actuator repairs & turbo rebuilds
- Transmission upgrades for 68RFE & Aisin trucks
- Preventive maintenance packages for towing & fleet reliability
Schedule Your Cummins Service in Magnolia, TX
If your 6.7 Cummins Ram is suffering from fuel, turbo, emissions, or valvetrain problems, bring it to DK Auto & Diesel Service for expert diagnostics and repairs.
Serving Magnolia, Montgomery, Conroe, The Woodlands, Tomball, Willis, and Spring.
Book a Cummins Diagnostic Today
FAQ About the 6.7L Cummins
What’s the most reliable 6.7 Cummins year?
- Many owners consider the 2013–2018 CP3 trucks the sweet spot for balance of power and reliability.
What’s the worst problem on these engines?
- 2007.5–2012 trucks often suffer from EGR/DPF issues, 2019–2020 from CP4 pump failures, and 2019+ models from cam/lifter wear.
How long will a 6.7 Cummins last?
- With proper care, 350k–400k miles is common. Fleet trucks often go even further with preventive maintenance.
