If you’re cross-shopping a Super Duty and typing “Ford F350 6.7 Power Stroke reliability” into Google at 11 p.m., you’re probably weighing a $50,000+ decision. That’s the right instinct. A diesel truck’s reliability isn’t one number — it changes a lot depending on model year, how the previous owner used it, and whether basic maintenance was actually done on schedule.
Short answer: yes, the 6.7 Power Stroke is generally reliable, especially from 2015 onward, but it has real, well-documented weak points you need to know about before you sign anything. This guide walks through exactly what breaks, when, why, and what it costs to fix — plus what to check on a used truck so you don’t inherit someone else’s problem.
Quick Answer: How Reliable Is the 6.7 Power Stroke?
The 6.7L Power Stroke (“Scorpion”) is Ford’s first fully in-house diesel V8, introduced in 2011 to replace the trouble-prone 6.0L and 6.4L engines. It uses a compacted graphite iron (CGI) block — roughly 25% stronger than conventional cast iron — and a reverse-flow cylinder head design that puts the exhaust ports inside the engine’s valley instead of the outer sides. That layout keeps the turbo closer to the exhaust and helps with response and heat management.
In practice, owner forums, diesel shops, and used-truck data generally agree on this pattern:
- 2011–2014 (first generation): The rockiest years. Turbo, EGR cooler, and sensor issues are common.
- 2015–2019 (second generation): A meaningful step up. Ford addressed many early complaints.
- 2020–present (third generation): Widely considered the strongest version yet, with more power and refined components.
That’s the trend. But “later is better” isn’t the whole story — some specific years and components deserve closer attention no matter the generation.
Note for readers who want hard numbers: exact failure-rate percentages and warranty-claim data aren’t publicly published by Ford. If you want statistically rigorous figures, cross-reference J.D. Power vehicle dependability studies, Consumer Reports reliability data, and NHTSA complaint/recall databases (linked in the sources section below) rather than relying on forum impressions alone.
Ford F350 6.7 Power Stroke: Generation-by-Generation Breakdown
First Generation (2011–2014): Powerful but Rough Around the Edges
The first-gen 6.7 launched with 400 horsepower and 800 lb-ft of torque — strong numbers for 2011, and a real leap from the problem-riddled 6.4L it replaced. But being Ford’s first from-scratch diesel meant some growing pains.
Common first-gen issues:
- Turbocharger failure. The single variable-geometry turbo was capable but got stressed under heavy towing, especially with oil leaks or carbon buildup around the vanes. Some owners report turbo trouble as early as 80,000–100,000 miles.
- EGR cooler clogging. Carbon deposits build up over time, reducing flow and sometimes causing temperature spikes.
- NOx sensor failures, particularly common on 2011–2012 trucks.
- Factory radiator defects on some early production trucks.
- Glow plug issues on a subset of early chassis-cab models, which in rare cases contributed to more serious problems.
- CP4.2 high-pressure fuel pump. This Bosch pump, used across most of the lineup through 2020, is lubricated only by diesel fuel itself. Contaminated or low-quality fuel can cause it to fail — and when it does, metal shavings can circulate through the entire fuel system, from injectors to the tank.
None of these are considered catastrophic, block-killing failures on their own. The core engine architecture held up. The complaints center on accessories and support systems, not the bottom end.
Second Generation (2015–2019): The Sweet Spot
In 2015, Ford made real changes: a larger, more durable turbocharger, revised EGR components, and reinforced internals. Horsepower climbed to 440 and torque to 860 lb-ft.
Diesel technicians and long-time owners frequently point to 2017–2019 as some of the most dependable model years in the engine’s history. The core problems weren’t eliminated entirely — the CP4.2 fuel pump risk persisted through this whole window — but the frequency of early failures dropped noticeably.
What improved:
- Stronger turbo design with less premature wear
- Better EGR cooler durability
- Fewer NOx and EGT sensor complaints
- Overall tighter quality control from the factory
Third Generation (2020–present): The Most Refined Version Yet
Starting in 2020, Ford bumped output to 475 horsepower and 1,050 lb-ft of torque and further reinforced internal components. Some model configurations shifted to a CP3-style pump setup, which diesel mechanics generally regard as more fuel-tolerant than the CP4.2.
In 2023, Ford introduced a High Output version of the 6.7L, aimed squarely at heavy commercial and towing use. Early data on this variant is still limited simply because it hasn’t been on the road long enough to build a multi-year track record — treat any strong claims about its long-term reliability with some caution until more mileage accumulates in the field.
Ford 6.7 Power Stroke Engine Problems: The Full List
Here’s a consolidated view of what actually breaks, organized by system rather than by year, since some of these issues span multiple generations.
| Problem Area | Most Affected Years | Typical Symptoms | Approx. Repair Cost* |
| CP4.2 high-pressure fuel pump | 2011–2020 | Hard starts, rail pressure codes, metal debris in fuel system | $2,500–$8,000+ (if contamination spreads) |
| Turbocharger | 2011–2014 (more isolated after) | Loss of power, whining noise, boost codes | $1,500–$3,500 |
| EGR cooler | 2011–2016 | Coolant loss, white smoke, temperature spikes | $800–$1,800 |
| Fuel injectors | All years, wear-related | Rough idle, misfires, fuel smell | $300–$600 per injector |
| DEF system (dosing module, tank heater, NOx sensors) | All years | Reduced power mode, DEF warning lights | $400–$2,000 |
| DPF (diesel particulate filter) | All years, worse with short trips/light towing | Frequent regen cycles, power derate | $1,500–$3,500 to replace |
| NOx sensors | 2011–2012 especially | Check engine light, derate | $300–$700 per sensor |
| Radiator (early defects) | 2011 mainly | Coolant leaks, overheating | $800–$1,500 |
*Repair cost ranges are general estimates based on common shop-rate reporting and parts pricing trends; get a quote from a diesel specialist in your area for an accurate number, since labor rates vary significantly by region.
Ford 6.7 Power Stroke Injector Problems
Injectors on any high-pressure common-rail diesel wear over time — that’s normal. What pushes injector problems from “expected maintenance” into “expensive repair” is usually fuel contamination, most often from a failing CP4.2 pump. If a pump fails and isn’t caught quickly, metal debris can score the injectors and force a full fuel-system replacement rather than a single-component fix. This is the single most expensive failure mode owners report on this engine.
Ford F350 Turbo Problems
Turbo failure is heavily concentrated in the 2011–2014 trucks. Oil leaks past the turbo seals, carbon buildup on the variable-geometry vanes, and general wear under heavy towing loads are the usual causes. A whining or grinding sound under acceleration, sluggish power delivery, or a boost-related trouble code are the early warning signs. Catching it early is far cheaper than driving on a failing turbo until it lets go completely.
Ford F350 DEF System and DPF Problems
The DEF (diesel exhaust fluid) and DPF (diesel particulate filter) systems exist to meet emissions regulations, and they’re a known pain point across nearly every modern diesel truck, not just Ford’s. Common complaints include:
- DEF dosing module failures
- Tank heater element failures in cold climates
- Frequent, inconvenient regeneration cycles on trucks used mostly for short trips or light-duty driving
- Power derate (the truck intentionally limits speed/power) when the DPF gets too full or a sensor faults
Expert tip: Trucks that mostly do short, low-load city driving are more prone to DPF regen issues than trucks that regularly tow or drive highway miles, because the exhaust doesn’t get hot enough often enough to burn off soot naturally. If you buy a 6.7 Power Stroke for light-duty use, expect more frequent regens — it’s not a defect, it’s how the system is designed to behave under that duty cycle.
How Long Does a Ford F350 6.7 Power Stroke Last?
With consistent maintenance, 300,000 miles is a realistic target, and many owners report the core engine going well beyond that — 400,000 to 500,000 miles isn’t unheard of among high-mileage commercial and fleet trucks. The CGI block and reverse-flow head design were built for heavy-duty longevity, and the fundamental architecture has proven durable across more than a decade on the road.
The catch: “the engine lasting” and “the truck being cheap to own” are two different things. Long before the block wears out, you’ll likely replace a turbo, an EGR cooler, injectors, DEF components, or the fuel pump — probably more than once over 300,000 miles. Lifespan and maintenance cost are two separate questions, and both matter.
Ford F350 6.7 Power Stroke Maintenance Cost: What to Budget For
Diesel trucks cost more to maintain than gas trucks, full stop. Here’s a general sense of what routine and semi-routine maintenance runs, so you can budget realistically:
| Service | Typical Interval | Approx. Cost |
| Oil and filter change | 7,500–10,000 miles | $150–$250 |
| Fuel filter replacement | 10,000–15,000 miles | $100–$200 |
| DEF fluid top-off | As needed | $15–$25 per gallon |
| Transmission fluid service | 30,000–60,000 miles | $300–$500 |
| Coolant flush | 60,000–100,000 miles | $150–$300 |
| Turbocharger replacement (if needed) | Varies | $1,500–$3,500 |
| CP4.2 fuel pump replacement (preventive) | Varies | $1,500–$3,000 |
Annual maintenance for a well-cared-for 6.7 Power Stroke commonly lands somewhere in the $1,000–$2,000 range for routine items alone, before factoring in any unexpected repairs. That number climbs fast if a major component fails outside of normal service.
Common mistake: Skipping fuel filter changes to save money. This is one of the most preventable causes of premature fuel pump and injector failure. A $100–$200 filter change is dramatically cheaper than an $8,000 fuel system replacement.
Best Year Ford F350 6.7 Power Stroke to Buy
Based on the pattern of factory improvements and owner-reported reliability:
- 2017–2019 is frequently cited as the sweet spot — mature second-generation engineering with most early bugs resolved, and typically available at a more reasonable used price than 2020+ trucks.
- 2020 and newer offers the strongest factory reliability improvements and more power, but commands a premium and has a shorter track record for long-term ownership data.
Worst Year Ford F350 6.7 Diesel to Avoid
If you’re being selective, 2011 tends to draw the most caution from diesel mechanics and long-time owners. It was the debut year, carrying the highest concentration of turbo, radiator, glow plug, and sensor complaints. 2012–2014 improved somewhat but still sit in the “first generation” bucket with a higher issue rate than 2015+.
This doesn’t mean every 2011–2014 truck is a bad buy — a well-maintained one with documented repairs (especially a replaced or upgraded turbo and addressed EGR cooler) can still be a solid, affordable option. It just means you should budget for those repairs if they haven’t already happened, and inspect more carefully.
Ford F350 6.7 Power Stroke Towing Reliability
Towing is where any Super Duty either proves itself or exposes weaknesses. A few practical points:
- Exhaust gas temperatures (EGT) climb fast under heavy towing loads, especially in hot weather or at higher elevations. Sustained high EGTs stress the turbo and EGR system — the two most failure-prone components on early trucks.
- Transmission health matters as much as engine health. The 6-speed (and later 10-speed) automatics paired with the 6.7 work hard under load; fluid changes on schedule are non-negotiable if you tow regularly.
- The 2020+ trucks with more torque headroom tend to run cooler under equivalent loads compared to first-gen trucks pulling near their max rating, simply because they’re not working as close to their limits.
Expert tip: If you regularly tow near the truck’s max rating, consider an aftermarket EGT gauge if the truck doesn’t already display one prominently. Catching a temperature spike early can be the difference between a minor issue and a cracked EGR cooler.
Pros and Cons of the Ford F350 6.7 Power Stroke
Pros:
- Strong, class-competitive torque and towing capability
- Durable CGI block architecture with genuine high-mileage potential
- Significant factory improvements from 2015 onward
- Wide aftermarket and independent-shop support (parts are not hard to find)
- Reverse-flow head design aids turbo response and cooling
Cons:
- CP4.2 fuel pump remains a real risk factor through 2020 model years
- Emissions system (DEF/DPF/EGR) adds complexity and repair cost across all years
- First-generation (2011–2014) trucks carry a higher known-issue rate
- Diesel-specific maintenance costs more than a comparable gas truck
- Frequent regens if used mainly for short, low-load trips
Used Ford F350 6.7 Power Stroke Buying Guide
Buying used is where most of the risk — and most of the savings — lives. Here’s a practical checklist.
What to Ask the Seller
- Full maintenance records, especially fuel filter and oil change history
- Has the CP4.2 pump ever failed or been preventively replaced/upgraded?
- Has the EGR cooler or turbo ever been replaced?
- Any DEF system warning lights or derate events?
- Was the truck used for heavy, frequent towing, or mostly light-duty driving?
What to Physically Inspect or Have a Shop Check
- Compression and fuel rail pressure test if possible
- Turbo for play, oil residue, or unusual noise on start-up
- Coolant condition and any signs of past EGR cooler leaks
- Scan for stored or pending diagnostic trouble codes, even if no warning light is currently on
- DEF fluid quality and tank/heater function
Common Mistakes Buyers Make
- Skipping a pre-purchase inspection by a diesel specialist (not just a general mechanic) to save $150–$200 — a mistake that can cost thousands later.
- Assuming “runs fine” means “no stored codes.” A truck can drive normally while sensors or components are already degrading.
- Ignoring maintenance records because the truck “looks clean.” Cosmetic condition tells you nothing about fuel filter or DEF system history.
- Buying a 2011–2012 truck without budgeting for a turbo or EGR cooler repair, even if it hasn’t happened yet.
How the 6.7 Power Stroke Compares to Rivals
A quick, honest comparison for buyers cross-shopping heavy-duty diesels:
| Engine | Reputation | Known Weak Point | Typical Longevity |
| Ford 6.7 Power Stroke | Reliable from 2015+ | CP4.2 pump, EGR/turbo (early years) | 300,000+ miles with maintenance |
| GM/Chevy 6.6 Duramax | Reliable, similar profile | Injector and turbo wear over time | Comparable to Power Stroke |
| Ram 6.7 Cummins | Often cited as the longevity leader | Emissions system complexity, some transmission concerns | Frequently exceeds 300,000–400,000 miles |
This isn’t a knock on the Power Stroke — all three modern heavy-duty diesels are broadly capable of very high mileage. The differences show up more in specific failure points and repair costs than in a dramatic reliability gap.
FAQs: Ford F350 6.7 Power Stroke Reliability
Is the Ford F350 6.7 Power Stroke a good engine overall?
Yes. It’s widely regarded as a durable, capable heavy-duty diesel, particularly from 2015 onward. Like any diesel, it needs consistent maintenance to reach its full lifespan potential.
What is the most common problem with the 6.7 Power Stroke?
The CP4.2 high-pressure fuel pump is the most frequently cited serious issue, since its failure can contaminate the entire fuel system. Turbocharger and EGR cooler problems are the next most common, concentrated in 2011–2014 trucks.
How many miles will a 6.7 Power Stroke last?
300,000 miles is a realistic, well-supported expectation with regular maintenance. Many owners report significantly higher mileage on well-cared-for trucks.
What year should I avoid when buying a 6.7 Power Stroke?
2011 draws the most caution due to a higher concentration of early production issues. 2012–2014 are improved but still part of the more issue-prone first generation.
Is the 6.7 Power Stroke more reliable than the 6.7 Cummins?
Both are strong, modern heavy-duty diesels. The Cummins has a longer overall reputation for extreme high-mileage durability among diesel enthusiasts, but the gap has narrowed significantly since Ford’s 2015 and 2020 updates. Individual maintenance history matters more than the badge on the hood.
Does towing shorten the life of a 6.7 Power Stroke?
Not inherently — the engine is built for towing. But sustained towing near maximum capacity, especially in hot weather, raises exhaust gas temperatures and stresses the turbo and EGR system, which can accelerate wear on those specific components if the truck isn’t properly maintained.
Is it worth buying a high-mileage 6.7 Power Stroke?
Often, yes — if you can verify maintenance history and get a pre-purchase inspection from a diesel specialist. A well-maintained 200,000-mile truck with documented service is frequently a better buy than a low-mileage truck with no records.
Conclusion: What to Actually Do With This Information
The Ford F350 6.7 Power Stroke earns its reputation as a genuinely capable, long-lasting diesel — but “reliable” doesn’t mean “maintenance-free.” Here’s what to take away:
- If you’re buying new or 2020+: You’re getting the most refined version of this engine to date. Stick to the recommended service intervals and you should get excellent long-term reliability.
- If you’re buying 2015–2019: This is a well-regarded sweet spot for price versus reliability. Verify fuel filter and DEF system service history before you buy.
- If you’re buying 2011–2014: Budget for a turbo and/or EGR cooler repair if it hasn’t happened already, and get a diesel specialist’s inspection before you commit. It can still be a smart, affordable choice — just go in with clear eyes.
- No matter the year: Never skip fuel filter changes, keep an eye on DEF and DPF warning signs, and get pre-purchase inspections from someone who specializes in diesel trucks, not a generalist mechanic.
A 6.7 Power Stroke that’s been maintained on schedule can genuinely be a 300,000-mile-plus truck. One that’s been neglected can turn into an expensive lesson fast. The engine isn’t the gamble — the maintenance history is.
