Engines & Platforms

6.7L Power Stroke: Strengths and the Spots to Watch

6 min readUpdated June 2026

Ford's in-house 6.7 "Scorpion" fixed the 6.0/6.4 reputation. It's strong and capable — here's what's great about it and the handful of things to keep an eye on.

Part of our Diesel Engine Guides →

The short version

The 6.7 Power Stroke is a clean-sheet Ford design — a big step up in reliability and towing tech.
Early trucks used a CP4 fuel pump that, if it fails, can contaminate the whole fuel system.
Watch the cooling system (dual radiators), and keep up with DEF/DPF emissions maintenance.
Serviced properly it's very reliable; neglected emissions and fuel-system care get expensive.

Why it's a strong engine

After the outsourced 6.0 and 6.4, Ford designed the 6.7 in-house. It uses a compacted-graphite-iron block, a strong rotating assembly, and modern towing integration, and it has steadily climbed in power across model years. Most owners get long, capable service from them.

The CP4 fuel pump

Early 6.7s (like several other modern diesels) use a Bosch CP4.2 high-pressure pump. When a CP4 fails it can send metal debris through the entire fuel system, turning a pump failure into injectors, lines, and rails — an expensive event. Clean, water-free fuel and on-time filter changes are the best defense, and many owners fit a disaster-prevention device or an upgraded pump.

This isn't unique to Ford — it's a CP4 trait — but it's the 6.7's most-discussed worry. See our CP4-vs-CP3 guide for the full picture.

Cooling and emissions

The 6.7 runs a primary and secondary radiator; keep the cooling system healthy, especially if you tow hard. Like all modern diesels it has a full emissions stack (EGR, DPF, SCR/DEF) — stay current on DEF, let it complete regens, and address warnings rather than ignoring them into a derate.

Ownership takeaway

A maintained 6.7 Power Stroke is a reliable, high-capability truck. The cost of ownership lives in fuel-system protection and emissions upkeep. If yours throws a fuel or emissions code, get it read and interpreted early — these are the systems where a small ignored fault becomes a big bill.

Frequently asked questions

Is the 6.7 Power Stroke reliable?

Yes — Ford's in-house 6.7 is a big step up from the 6.0/6.4 and is very reliable when serviced. The main concern is CP4 fuel-pump protection on the years that used it.

What is the CP4 problem on the 6.7 Power Stroke?

Early 6.7s use a Bosch CP4 pump that, if it fails, can send metal debris through the whole fuel system. Clean fuel, on-time filters, and a protection device reduce the risk.

How much power does the 6.7 Power Stroke make?

Output has climbed steadily across model years; later trucks make very high torque with strong factory towing integration. Exact figures depend on the model year.

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