ENG-04 / 2007.5-present
Bigger bore and stroke, variable-geometry turbo, and modern emissions hardware. Introduced partway through the 2007 model year; still offered in 2026 Ram 2500/3500.
Figures for Dodge/Ram pickup applications. Where sources disagree, we say so in the row.
| Engine family | Cummins ISB 6.7 (B-series)[1,3] |
|---|---|
| Displacement | 6.7 L / 408 cu in[1,3] |
| Bore x stroke | 4.21 x 4.88 in (107 x 124 mm)[1,3] |
| Compression ratio | About 17.2–17.3:1 (2007.5–2012)[1,3]DrivingLine says 17.3:1, Diesel Hub 17.2:1. Later engines use different ratios by output and year, and the published figures don't agree, so we leave them out. |
| Firing order | 1–5–3–6–2–4[3] |
| Fuel system | Bosch high-pressure common rail: CP3 (2007.5–2018), CP4.2 (2019–2020), CP3 again (2021–2024), new high-pressure pump for 2025[1,3,5,6]Diesel Hub identifies the 2025 pump as a Bosch CP8; the Cummins press release only calls it a new fuel pump. |
| Peak injection pressure | About 26,000 psi (2007.5–2018)[1,3] |
| Turbocharger | Holset HE351VE variable-geometry (2007.5–2012); Holset HE300VG (2013 on), revised for 2019 and 2025[1,3,2] |
| Exhaust brake | Built in, using the VGT[1,4] |
| Emissions equipment | EGR, oxidation catalyst and DPF from 2007.5; NOx adsorber (2007.5–2012 pickups); SCR with DEF from 2013 pickups[1,3] |
| Cold-start aid | Intake grid heater through 2024; glow plugs from 2025[6,3] |
| Transmissions (pickups) | 68RFE 6-speed auto; G56 6-speed manual (through 2018); Aisin AS69RC (2013–2024, HO, Ram 3500); 8-speed TorqueFlite HD (2025 on)[1,3,8,6] |
| Oil capacity (with filter) | Approx. 12 qt (pickups)[3]Confirm with your owner's manual; capacities vary by application. |
| Coolant capacity | Not listed: varies by yearNot confirmed across two sources. |
Ram 2500/3500 pickup ratings. Cab-chassis (3500/4500/5500) trucks use lower ratings and are not listed here.
| Model years | Configuration | Power | Torque | Src |
|---|---|---|---|---|
| 2007.5–2010 | 68RFE automatic | 350 hp | 650 lb-ft | [1,3] |
| 2007.5–2012 | G56 manual | 350 hp | 610 lb-ft | [1,3] |
| 2011–2012 | 68RFE automatic | 350 hp | 800 lb-ft | [1,3] |
| Diesel Hub notes the 800 lb‑ft rating began with trucks built around February 2011. | ||||
| 2013–2018 | G56 manual | 350 hp | 660 lb-ft | [3] |
| Single source. | ||||
| 2013–2018 | 68RFE automatic | 370 hp | 800 lb-ft | [1,3] |
| 2013–2014 | High Output, Aisin AS69RC (3500) | 385 hp | 850 lb-ft | [1,2,3] |
| 2015 | High Output, Aisin AS69RC (3500) | 385 hp | 865 lb-ft | [1,2,3] |
| 2016–2017 | High Output, Aisin AS69RC (3500) | 385 hp | 900 lb-ft | [1,2,3] |
| 2018 | High Output, Aisin AS69RC (3500) | 385 hp | 930 lb-ft | [1,2,3] |
| 2019–2024 | 68RFE automatic (standard output) | 370 hp | 850 lb-ft | [3,7] |
| 2019–2020 | High Output, Aisin AS69RC (3500) | 400 hp | 1,000 lb-ft | [1,2,3] |
| 2021–2024 | High Output, Aisin AS69RC (3500) | 420 hp | 1,075 lb-ft | [2,3,7] |
| 2025–2026 | High Output, 8-speed automatic (only diesel offered) | 430 hp | 1,075 lb-ft | [6,8,3] |
6.7L replaces the 5.9L: larger bore and stroke, VGT turbo, EGR and DPF, 68RFE automatic.[1,3]
Turbine housing gets an access port for cleaning the VGT vanes.[3,4]
SCR/DEF added to pickups (the NOx adsorber goes away), new HE300VG turbo, and a High Output version with the Aisin AS69RC in Ram 3500.[1,3,2]
Last year of the G56 manual.[3]
Major redesign: compacted-graphite-iron block, forged rods, hydraulic lifters, revised turbo, CP4.2 pump. HO reaches 1,000 lb‑ft.[2,3]
Next-generation 6.7: 430 hp HO standard with a new 8-speed, new fuel pump with top-feed injectors, glow plugs, top-side oil and fuel filter service.[6,8,3]
These are patterns reported by the sources below, not a prediction for any one truck. Many engines never have these problems. Diagnose before you buy parts, and follow factory service information for repairs.
Applies to Most common on 2007.5–2012
The diesel particulate filter traps soot and periodically burns it off (regeneration). On early trucks without SCR, the engine had to run in a way that produced more soot, and DPF clogging was a common complaint. Pickups gained SCR/DEF for 2013, which eased the problem considerably.
Applies to 2007.5 on (most discussed on early trucks)
The VGT's moving vanes can gum up with soot and carbon, causing lag or poor top-end power. Using the exhaust brake regularly exercises the mechanism; Cummins added a cleaning access port in 2009. Badly stuck units usually need removal and cleaning.
Applies to 2007.5 on
The 6.7 was the first Cummins in a Ram with exhaust gas recirculation. High-mileage engines often see sticking EGR valves or plugged coolers. DrivingLine notes a Cummins cleaning interval of 67,500 miles for the EGR valve and cooler.
Interval quoted from DrivingLine; confirm in your truck's maintenance schedule.
Sources [1]
Applies to Mostly 2007.5–2012
Early 6.7s heat the DPF by injecting a little fuel late in the cycle. Some of that fuel can wash past the rings into the oil, thinning it. Diesel Hub reports Ram treats up to 5% dilution as acceptable, and that SCR-equipped trucks see much less of it.
Applies to 2019–2020
For 2019 the 6.7 switched to a Bosch CP4.2 pump. A pump failure can contaminate the whole fuel system. FCA recalled 2019–2020 trucks to replace the pump and inspect the fuel system (NHTSA 21V-880, below), and production returned to the CP3 for 2021.
Applies to All 6.7, most often modified engines
The 6.7 runs more cylinder pressure than the 5.9, and head gasket failures are more common than on the older engine, though not common overall. DrivingLine notes they mostly happen on modified engines using factory head bolts.
Recalls: enter your 17-character VIN at nhtsa.gov/recalls. It shows any unrepaired safety recall on that exact truck.
Service bulletins (TSBs): on the same NHTSA page, search by year, make and model instead of VIN. The results include recalls, investigations, complaints and manufacturer communications, which is where TSB summaries are listed. Shortcuts: 2019 RAM 2500 2021 RAM 3500
We don't reproduce bulletin text. It's the manufacturer's copyrighted material, and summaries on NHTSA are the authoritative public record. More on this on the Recalls & TSBs page.
Engine- and diesel-specific campaigns we found in NHTSA's data for Dodge/Ram 2500 and 3500 (2007–2026). Some also cover cab-chassis trucks; two apply only to cab chassis. Newer trucks have many non-engine recalls too, so always run your VIN.
An under-hood silencer (insulation) pad could sag onto the EGR cooler, creating a fire risk. Dealers added a support bracket.[10]
Electrical connectors at the diesel fuel heater could overheat and lead to a fuel leak. Dealers fitted an upgraded connector/terminal kit and checked the heater for leaks.[10]
The engine control module could short-circuit and stall the engine. Affected trucks got a new ECM.[10]
Some replacement-brand water pumps built without a vent hole could leak coolant. Dealers replaced the water pump.[10]
Fuel lines could leak into the engine compartment. Dealers inspected the lines and replaced them where needed.[10]
The solid-state intake heater grid relay could short and cause a fire. NHTSA lists this campaign as superseded by 21V-798.[10]
Expanded relay campaign (relay inspection/replacement; owners told to park outside until repaired). NHTSA lists it as superseded by 23V-060.[10]
Final, expanded relay campaign: the heater grid relay could short with the key on or off. Dealers replace the relay; park outside until it is done.[10]
Some engine control modules were built with a misaligned capacitor that could short and cause loss of drive power. Dealers replace the ECM.[10]
Engine warm-up protection could be inadequate, risking rod-bearing damage. The remedy was an engine calibration update. (Cab chassis only, not pickups.)[10]
Engine software might not warn the driver about low oil volume. The remedy was a calibration update. (Cab chassis only.)[10]
Accessed October 2026. Numbers in brackets throughout the page point here. Brand names are used descriptively.