The 5th Gen Ram 2500 and 3500 with the 6.7L Cummins arrived in 2019 with massive expectations. New body style. New interior. New technology. And a Cummins that promised more power and refinement than ever before.
But with those upgrades came some controversial changes that diesel owners still debate today.
So let’s talk about it honestly — the good, the bad, and the ugly of the 2019+ 6.7 Cummins.
The Good: Why People Love the 5th Gen Cummins
There’s a reason these trucks sell so well. When the 5th Gen Cummins is good — it’s really good.
Power & Torque
Depending on year and configuration, factory output reaches:
- Up to ~420 HP
- Up to ~1,075 lb-ft of torque
That torque number alone puts the 5th Gen Cummins into serious work-truck territory. Towing performance is outstanding.
Interior & Comfort
The 5th Gen Ram interior is widely considered the best HD truck interior in the segment. Ride comfort, noise reduction, infotainment, and overall refinement are a huge step forward.
Ride Quality
With coil-spring rear suspension on 2500s and improved geometry, these trucks ride better than any Ram HD before them.
Exhaust Brake & Towing Control
The integrated exhaust brake, transmission tuning, and stability systems make towing heavy loads far less stressful than on older generations.
The Bad: The Changes Diesel Fans Didn’t Love
Now for the stuff owners talk about in forums…
The CP4 Injection Pump (2019–2020)
One of the biggest controversies was Ram’s switch from the proven CP3 pump to the Bosch CP4 in 2019–2020.
The CP4 has a known reputation across multiple brands for:
- Low lubrication tolerance
- Potential catastrophic failure
- Metal contamination of the entire fuel system when it fails
This single change made many Cummins loyalists nervous — and for good reason.
CGI Engine Block
The switch to a Compacted Graphite Iron (CGI) block was done for strength and emissions compliance. While CGI is technically stronger, many enthusiasts prefer the traditional cast iron block for repairability and long-term confidence.
Emissions Complexity
Modern emissions systems are more complicated than ever:
- DPF
- EGR
- SCR
- DEF dosing systems
- Multiple sensors
When everything works, it works great. When something fails, repairs can be expensive.
The Ugly: The Stuff Owners Don’t Like to Talk About
This is where honesty really matters.
Fuel System Risk
When a CP4 fails, it doesn’t just fail quietly — it can contaminate injectors, rails, lines, and tanks. Repair bills can climb into five figures.
This is why fuel system protection is a major focus for many 5th Gen owners.
Electronics Overload
With modern trucks comes modern complexity. Sensors, modules, and software all play a role in drivability. Troubleshooting is no longer simple.
Cost of Ownership
While these trucks are incredible, maintenance and repair costs are undeniably higher than older generations.
The Redemption: Why the 5th Gen Cummins Still Makes Sense
Despite all of that — many owners still love their 5th Gen Cummins.
Why?
- They tow like monsters
- They ride incredibly well
- They are extremely comfortable
- They look fantastic
- They make huge torque
And importantly — Ram listened. The CP3 returned in later years, restoring confidence in the fuel system.
How Owners Protect Their 5th Gen Cummins
Smart owners focus on prevention instead of reaction.
Popular reliability upgrades include:
- FASS Fuel Systems for clean, air-free, consistent fuel pressure
- High-quality filtration
- Proper maintenance intervals
- Fuel additives when appropriate
Clean fuel is the single biggest factor in protecting modern diesel injectors and pumps.
Performance Potential
The 5th Gen 6.7 Cummins still responds extremely well to airflow and fueling improvements.
- Strong turbo potential
- Excellent towing torque
- Great low-RPM response
While tuning options are more limited due to encryption and emissions compliance, safe gains are still very possible when done correctly.
So… Is the 5th Gen Cummins Good or Bad?
The honest answer: It depends on what you want.
If you want:
- The most comfortable Ram HD ever built
- Best towing refinement
- Modern technology
…the 5th Gen Cummins is outstanding.
If you want:
- Simplicity
- Lower long-term repair risk
- Maximum mechanical confidence
…older generations may still be more appealing.
Neither side is wrong — it’s just about priorities.
FASS Motorsports: Helping 5th Gen Cummins Owners Do It Right
At FASS Motorsports, we work with 5th Gen Cummins trucks every day. Our goal is to help owners:
- Protect their fuel systems
- Improve reliability
- Upgrade responsibly
- Enjoy their trucks long-term
Whether you daily drive, tow heavy, or plan future upgrades, we’re here to help you build smart.
👉 Shop 6.7 Cummins Upgrades
👉 Visit our Washington, MO showroom for expert advice
Final Thoughts
The 5th Gen 6.7 Cummins isn’t perfect — but no diesel ever is. What it offers is incredible capability, comfort, and power in a modern package.
When understood, maintained, and protected properly, it can be an excellent long-term truck.
Have questions? We're here to help!
- Phone: (636) 429-7020
- Email: info@fassmotorsports.com
FASS Motorsports
25 Town and Country Drive
Washington, MO 63090
