The 6.7 Powerstroke is a strong engine whose most common problems are EGR cooler failure, turbo wear, CP4 pump risk on 2011 to 2022 models, and DEF system faults. The 2015 to 2019 model years have the fewest complaints in the shop.
- EGR cooler failure is the most common expensive repair, watch for unexplained coolant loss
- CP4 pump affects 2011 to 2022 models, Ford redesigned the pump for 2023
- DEF system sensors and heaters cause frustrating limp mode events
- 2015 to 2019 is the sweet spot for reliability and value
- Buy on maintenance history, not mileage
The 6.7 Powerstroke has been Ford's in-house diesel since 2011, and it is a fundamentally good engine. But "good engine" and "no problems" are different things. Here is what I see in the shop, ranked by frequency.
1. EGR cooler failure
The most common expensive repair I do on 6.7 Powerstrokes. The EGR cooler cracks internally, coolant leaks into the intake, and you get white smoke and coolant loss with no external leak. On 2011 to 2014 trucks especially. If your coolant keeps dropping and you cannot find a drip, this is suspect number one.
2. Turbocharger issues
The single sequential turbo on the 6.7 is a clever design and a known wear item. Symptoms: loss of power, whistle that was not there before, or a P0299 underboost code. The 2011 to 2012 turbos were the worst. Later years are better but turbos still do not last forever, especially on trucks that idle for hours.
3. Fuel system (CP4)
Like the Cummins and Duramax of the same era, the 2011 to 2022 Powerstroke runs a CP4 high pressure pump. Same story: when it fails, metal contaminates the whole system. Use a lubricity additive, change fuel filters on time, and never run the tank dry. Ford switched to a different pump design for 2023, which was overdue.
4. DEF system faults
NOx sensors, DEF pump, heater. The DEF system throws codes that put the truck in limp mode, which always seems to happen on a Friday before a long weekend. Most DEF faults I see are sensor or heater related, not the fluid itself. Keep a spare NOx sensor in mind if you tow far from civilization.
5. Radiator and cooling
The 6.7 runs two cooling systems (high temp and low temp loops). The primary radiator and the secondary system both develop leaks with age. Watch your coolant levels. Overheating a 6.7 gets expensive fast.
The years to know
- 2011–2012: First years. Turbo and valve issues. Cheapest to buy, most likely to need work.
- 2013–2014: Better, but EGR cooler problems peak here.
- 2015–2019: The sweet spot in my opinion. Proven, most early issues sorted.
- 2020–2022: More power, 10-speed auto. Solid, but CP4 still present.
- 2023+: New pump design, most powerful version yet. Too new for long-term verdicts from my bay.
Bottom line
A maintained 6.7 Powerstroke is a 400,000 km engine. The problems above are real but they are known quantities — every one of them has a known fix and a known cost. Buy on maintenance history, not mileage. A 250,000 km truck with full service records beats a 120,000 km truck with none, every time.
Frequently asked questions
Is the 6.7 Powerstroke reliable?
Yes, with maintenance. It is a fundamentally good engine. The problems are known quantities with known fixes, which is actually reassuring compared to surprise failures.
Should I buy a used 6.7 Powerstroke?
Yes if the service history is complete. Prioritize 2015 to 2019 models. Get a pre purchase inspection that includes checking for coolant loss and reading stored fault codes.
6.7 Powerstroke vs 6.7 Cummins, which is better?
The Powerstroke makes more power and tows bigger numbers. The Cummins is simpler and cheaper to work on. For pure reliability with basic maintenance, the Cummins has the edge. For maximum capability, the Powerstroke wins.