6.7L Cummins Diesel Updates by Year

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The diesel market has become increasingly competitive, and Cummins has continuously updated the 6.7L Turbodiesel to keep pace. Many of its modifications over time were driven by rising performance demands, which required structural reinforcements to withstand higher stresses. Other updates focused on cleaner emissions, better fuel efficiency, enhanced reliability, or a mix of these factors. The most extensive updates occurred in the 2013, 2019, and 2025 model years.

2009

  • Added an access port in the turbocharger turbine housing, allowing VGT vane cleaning without removing the turbocharger for easier servicing.
  • Upgraded fuel filter housing and filter element for improved filtration.
  • Redesigned water pump inlet housing.
  • Updated EGR coolant hoses and fittings.

2010

  • Transitioned to a single PCM (engine-mounted ECU) managing both engine and transmission, replacing the previous dual-unit setup.
  • Revised fuel filter housing with a quarter-turn drain valve.
  • Updated thermostat with a higher 200 °F opening point, slightly raising operating temperature (not interchangeable with older versions).

2011

  • Pickup models with the 68RFE automatic gained 150 lb-ft of torque, while horsepower stayed the same. G56 manual trucks saw no performance changes.
  • Chassis cab models received SCR emissions aftertreatment, requiring DEF.

2013

  • Across-the-board power increases: chassis cab G56 models +15 hp/+40 lb-ft, automatics +20 hp/+140 lb-ft, pickup G56 models +50 lb-ft (no hp increase). Standard output gained 20 hp but stayed at 800 lb-ft.
  • A new High Output version debuted for Ram 3500s, adding +15 hp and +50 lb-ft over standard.
  • SCR became standard for all pickups (DEF required).
  • Mechanical updates included a new camshaft (chassis cabs), redesigned pistons, piston skirt coating, new cooling jets, new vibration damper, updated bedplate, Holset HE300VG turbo, larger EGR cooler, smaller water pump/fan pulley, and a new ECU with more processing capacity.
  • AS69RC replaced AS68RC in chassis cabs.

2016

  • H.O. engines recalibrated for +35 lb-ft, reaching 900 lb-ft. Standard and chassis cab engines unchanged.

2018

  • H.O. torque increased to 930 lb-ft. No changes for standard output or chassis cab.
  • Final year for the G56 manual transmission.

2019

  • Pickup engines received torque boosts: H.O. from 930 to 1,000 lb-ft and standard output from 800 to 850 lb-ft. H.O. power rose from 385 to 400 hp, making the 6.7 Cummins the first pickup engine to hit 1,000 lb-ft. Chassis cab calibration unchanged.
  • Significant redesigns included:
    • New pistons (larger wrist pins, revised bowl geometry, lower friction rings, altered compression ratios).
    • Stronger forged rods and crankshaft.
    • A compacted graphite iron (CGI) block for strength and weight reduction.
    • Updated cylinder head (new springs, valves, rocker arms, larger bolts).
    • Hollow camshaft, new hydraulic lifters, and revised rocker arms.
    • Updated Holset turbo delivering up to 33 psi boost.
    • New exhaust manifold design and turbo relocation.
    • Bosch CP4.2 pump (replacing CP3), raising injection pressure to 29,000 psi.
    • Revised injectors, cooling, lube oil pump, and aluminum housings for oil/water pumps.

2020

  • Chassis cab calibration raised to 360 hp (+35) and 800 lb-ft (+50). Pickup engines unchanged.

2021

  • Returned to Bosch CP3 pump after CP4 issues; recall issued for 2019–2020 models to retrofit CP3.
  • H.O. engines gained +20 hp and +75 lb-ft with a new ECU calibration.
  • Standard and chassis cab engines unchanged.

2025

  • Ram streamlined the diesel lineup to a single option: the H.O. 6.7 Cummins paired with the ZF PowerLine 8-speed automatic. Pickup and chassis cab models share the same engine but retain different ECU calibrations, with pickups receiving an extra 10 hp.
  • Major updates included:
    • Bosch CP8 fuel pump rated to 32,000 psi.
    • Traditional glow plugs replacing the grid heater for cleaner startups.
    • New cartridge-style oil filter.
    • Revised turbocharger.
    • Engine-mounted DOC for quicker light-off and better efficiency.
    • Updated EGR system.
    • New cylinder head with externally mounted injectors for easier servicing.
    • Redesigned intake manifold for better cylinder airflow.
    • Return to a grey cast iron block (no longer CGI).
    • New piston design with lower 16.0:1 compression.
    • ZF PowerLine 8-speed standard across all models.

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