Let me be upfront: I hesitated before writing this.
Because if you search "6.7 Cummins EGR delete" right now, you'll find plenty of product pages, dyno charts, and videos of trucks rolling coal. What's harder to find is someone willing to answer the question you're actually asking:
Does this generation of the 6.7L Cummins really need its EGR system deleted?
It's not a 6.0L Powerstroke. Delete it or don't, you're not gambling with coolant in your cylinders. It's not a 6.4L. You're not draining 24 quarts of fuel-diluted oil at every change. The 2019+ 6.7L leaves the factory with 400 horsepower, 1,000 lb-ft of torque, and a reputation as the most reliable heavy-duty diesel on the road.
So why touch it?
I spent the last week digging through service bulletins, tuner forums, and parts manufacturer white papers. Not to convince you to delete your EGR. To help you figure out whether your specific truck, your specific driving habits, and your specific tolerance for maintenance make it a rational choice—or an unnecessary headache.
It does not suffer from the 6.0L's coolant-into-cylinder hydro-lock risk. It does not have the 6.4L's cooler-plugging, head-gasket-blowing thermal overload problem. It is not the L5P's 60,000-mile crack-waiting-to-happen.
What it does have is two chronic, performance-degrading issues:
So the question isn't "Is this engine defective?"
The question is: "Are you okay with how it performs at 100,000 miles?"
This isn't a design flaw. It's the design. And it has an unavoidable consequence: carbon deposits.
On the 2019+ 6.7L, these deposits accumulate in three specific places:
1. The EGR Valve Itself
The valve pintle and seat slowly crust over. Opening response becomes sluggish. Eventually, the valve may stick partially open or fail to close completely. Symptoms include rough idle, surging at low RPM, and eventually P0401 (Insufficient EGR Flow) or P0405 (EGR Sensor A Circuit Low).
2. The EGR Cooler Tubes
The cooler's internal passages are narrow by design. Carbon buildup reduces flow efficiency. The engine has to work harder to push exhaust through, increasing pumping losses and reducing fuel economy.
3. The Intake Manifold and Ports
This is the silent killer of performance. A 1/8" layer of carbon on intake port walls reduces airflow. Not catastrophically—not enough to trigger a check engine light. But enough that your truck feels "lazy" at 80,000 miles compared to how it felt at 20,000.
Real-world owner feedback:
Starting in 2019, the 6.7L EGR system added an electronically controlled cooler bypass valve.
How it works:
The valve is controlled by a PWM signal from the PCM and includes a position sensor. Both the solenoid and the sensor are failure-prone. Common culprits include carbon fouling, thermal fatigue, and electrical connector corrosion.
When it fails, you get:
The bypass valve assembly is not a cheap part. Expect $250–$400 in parts, plus labor. And because the root cause is thermal and carbon exposure, replacement doesn't guarantee the new valve won't fail again in another 50,000 miles.
1. Intake Air Temperature Drop: 50°F – 90°F
This is physics. You stop feeding 300°F exhaust gas into a 100°F intake stream. Cooler air = denser air = more oxygen = more complete combustion.
2. EGT Reduction: 100°F – 150°F under load
No EGR means the turbo isn't compressing and re-processing already-burned gas. The engine breathes fresh air only. This is the single biggest thermal protection benefit for heavy towers.
3. Fuel Economy Improvement: 5% – 15%
This number shows up consistently across multiple tuner platforms. The sources:
This is what almost every user reports within the first 10 miles. Not horsepower—response. The lag between pedal input and acceleration shrinks noticeably.
5. Permanent Elimination of EGR-Related Codes
P0401, P0405, P1486, P1489. All of them. Permanently.
In the United States, removing or disabling the EGR system on a vehicle driven on public roads is a violation of the Clean Air Act.
Specific restrictions:
The 2019+ ECM is encrypted and significantly more locked down than earlier generations.
What's required:
3. Warranty: Immediate and Permanent Void
If your truck is still under factory or extended warranty, any emissions-related modification will result in denial of coverage for the entire powertrain if a failure occurs and the modification is discovered.
It is not the 6.0L's hydro-lock threat. It is not the 6.4L's oil-dilution crisis. It is not the L5P's 60k-mile cooler lottery.
It is a system that functions as designed—but whose design inherently trades long-term performance for short-term emissions compliance.
The carbon accumulation is unavoidable.
The bypass valve is a new, non-trivial failure point.
The performance degradation is real, measurable, and often misattributed to "the truck getting old."
Ready to remove your truck's EGR system? Visit www.trucktok.com to learn about our extensive diesel performance solutions. Decide whether you want to fully realize the true potential of your diesel engine based on our available EGR removal options.
*If you've deleted EGR on a 2019+ 6.7L, what was your experience with tuner support, ECM unlocking, and long-term drivability? Drop it below.*
Because if you search "6.7 Cummins EGR delete" right now, you'll find plenty of product pages, dyno charts, and videos of trucks rolling coal. What's harder to find is someone willing to answer the question you're actually asking:
Does this generation of the 6.7L Cummins really need its EGR system deleted?
It's not a 6.0L Powerstroke. Delete it or don't, you're not gambling with coolant in your cylinders. It's not a 6.4L. You're not draining 24 quarts of fuel-diluted oil at every change. The 2019+ 6.7L leaves the factory with 400 horsepower, 1,000 lb-ft of torque, and a reputation as the most reliable heavy-duty diesel on the road.
So why touch it?
I spent the last week digging through service bulletins, tuner forums, and parts manufacturer white papers. Not to convince you to delete your EGR. To help you figure out whether your specific truck, your specific driving habits, and your specific tolerance for maintenance make it a rational choice—or an unnecessary headache.
Part 1: The Short Answer
The 2019-2024 6.7L Cummins EGR system does not have a catastrophic failure defect.It does not suffer from the 6.0L's coolant-into-cylinder hydro-lock risk. It does not have the 6.4L's cooler-plugging, head-gasket-blowing thermal overload problem. It is not the L5P's 60,000-mile crack-waiting-to-happen.
What it does have is two chronic, performance-degrading issues:
- Progressive carbon buildup that gradually reduces throttle response and fuel economy.
- A new failure point—the EGR cooler bypass valve—that didn't exist on earlier generations.
So the question isn't "Is this engine defective?"
The question is: "Are you okay with how it performs at 100,000 miles?"
Part 2: Problem 1 – The Carbon Tax
EGR works by taking exhaust gas—which contains soot, unburned fuel, and oil vapor—and routing it directly into your intake manifold.This isn't a design flaw. It's the design. And it has an unavoidable consequence: carbon deposits.
On the 2019+ 6.7L, these deposits accumulate in three specific places:
1. The EGR Valve Itself
The valve pintle and seat slowly crust over. Opening response becomes sluggish. Eventually, the valve may stick partially open or fail to close completely. Symptoms include rough idle, surging at low RPM, and eventually P0401 (Insufficient EGR Flow) or P0405 (EGR Sensor A Circuit Low).
2. The EGR Cooler Tubes
The cooler's internal passages are narrow by design. Carbon buildup reduces flow efficiency. The engine has to work harder to push exhaust through, increasing pumping losses and reducing fuel economy.
3. The Intake Manifold and Ports
This is the silent killer of performance. A 1/8" layer of carbon on intake port walls reduces airflow. Not catastrophically—not enough to trigger a check engine light. But enough that your truck feels "lazy" at 80,000 miles compared to how it felt at 20,000.
Real-world owner feedback:
Key point: This isn't a "if." It's a "when." Every 6.7L EGR system accumulates carbon. The only variable is how long it takes to affect your driving experience.
Part 3: Problem 2 – The Cooler Bypass Valve (2019+ New Failure Mode)
This is the one your uncle with a 2012 Cummins won't recognize.Starting in 2019, the 6.7L EGR system added an electronically controlled cooler bypass valve.
How it works:
- Cold start: Valve opens, exhaust bypasses the cooler, flows directly to the intake. This speeds engine warm-up and reduces white smoke.
- Normal operation: Valve closes, exhaust routes through the cooler, temperature drops, NOx emissions are controlled.
The valve is controlled by a PWM signal from the PCM and includes a position sensor. Both the solenoid and the sensor are failure-prone. Common culprits include carbon fouling, thermal fatigue, and electrical connector corrosion.
When it fails, you get:
- P1486 / P1489 (EGR Cooler Bypass Control Circuit / Performance)
- Persistent check engine light
- Noticeable loss of throttle response
- Reduced fuel economy
- Potential power derate
The bypass valve assembly is not a cheap part. Expect $250–$400 in parts, plus labor. And because the root cause is thermal and carbon exposure, replacement doesn't guarantee the new valve won't fail again in another 50,000 miles.
Part 4: What You Actually Gain by Deleting It
Let's talk numbers—not from marketing copy, but from tuner validation threads and user-reported data.1. Intake Air Temperature Drop: 50°F – 90°F
This is physics. You stop feeding 300°F exhaust gas into a 100°F intake stream. Cooler air = denser air = more oxygen = more complete combustion.
2. EGT Reduction: 100°F – 150°F under load
No EGR means the turbo isn't compressing and re-processing already-burned gas. The engine breathes fresh air only. This is the single biggest thermal protection benefit for heavy towers.
3. Fuel Economy Improvement: 5% – 15%
This number shows up consistently across multiple tuner platforms. The sources:
- No exhaust gas diluting fresh air = higher combustion efficiency
- No parasitic loss from the EGR pump (the engine isn't working to push exhaust through a restricted cooler)
- More complete burn = less fuel wasted
This is what almost every user reports within the first 10 miles. Not horsepower—response. The lag between pedal input and acceleration shrinks noticeably.
5. Permanent Elimination of EGR-Related Codes
P0401, P0405, P1486, P1489. All of them. Permanently.
Part 5: The Hard Part – What You Lose
1. Legal Compliance – This Is Not Optional Warning TextIn the United States, removing or disabling the EGR system on a vehicle driven on public roads is a violation of the Clean Air Act.
Specific restrictions:
- California, New York, Maine, Pennsylvania, etc. – Any vehicle subject to biennial emissions inspection will fail visibly with EGR components missing.
- Even in "non-testing" states – Federal law still prohibits tampering. Enforcement is rare, but the legal exposure exists.
- Resale impact – Selling a deleted truck across state lines or to an unsuspecting buyer carries liability.
The 2019+ ECM is encrypted and significantly more locked down than earlier generations.
What's required:
- ECM unlocking service (varies by year; some 2022-2024 trucks require ECM exchange / physical swap)
- Supported tuning platform: EZ Lynk, RaceME Ultra, or HP Tuners with appropriate credits
- Tuner must support both DPF/EGR disable and proper fueling/torque recalibration for mechanical components
3. Warranty: Immediate and Permanent Void
If your truck is still under factory or extended warranty, any emissions-related modification will result in denial of coverage for the entire powertrain if a failure occurs and the modification is discovered.
Part 6: The Decision Framework
You are a candidate for EGR delete IF:- You have existing carbon buildup symptoms – delayed throttle response, reduced highway MPG, occasional EGR codes.
- You have already diagnosed and confirmed P1486/P1489 and do not want to replace the bypass valve every 50k miles.
- You tow heavy regularly – especially in mountainous terrain – and want the maximum EGT reduction available.
- You live in an area without emissions testing, or have a clear legal path for non-compliance.
- Your truck is still under warranty and you cannot absorb the risk of a denied claim.
- You live in a state with annual emissions inspection that includes visual underhood checks.
- You are not prepared to invest in proper tuning (the "hardware only, no tune" approach will not work on this generation).
- Your primary concern is peak horsepower, not drivability or thermal protection (there are cheaper, less-invasive ways to gain power).
Part 7: Summary – The 6.7L EGR Paradox
The 2019-2024 6.7L Cummins EGR system is not "broken."It is not the 6.0L's hydro-lock threat. It is not the 6.4L's oil-dilution crisis. It is not the L5P's 60k-mile cooler lottery.
It is a system that functions as designed—but whose design inherently trades long-term performance for short-term emissions compliance.
The carbon accumulation is unavoidable.
The bypass valve is a new, non-trivial failure point.
The performance degradation is real, measurable, and often misattributed to "the truck getting old."
Ready to remove your truck's EGR system? Visit www.trucktok.com to learn about our extensive diesel performance solutions. Decide whether you want to fully realize the true potential of your diesel engine based on our available EGR removal options.
*If you've deleted EGR on a 2019+ 6.7L, what was your experience with tuner support, ECM unlocking, and long-term drivability? Drop it below.*
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