The Ford 6.7L Power Stroke diesel was introduced in 2011 Super Duty trucks as Ford's first in-house diesel V8, replacing the outsourced 6.4L. It has matured into one of the most capable towing engines on the road, but every generation of the 6.7L has a few well-known weak points that show up with age, mileage, and hard work.

Owners commonly report high-pressure fuel pump (CP4) failures, turbocharger wear, EGR cooler problems, and emissions system trouble. At Deer Park Diesel in Clayton, WA, we've spent over two decades working on light-duty diesel pickups, and we diagnose, repair, and upgrade the 6.7L Power Stroke to keep it working as hard as you do.

Common Ford 6.7L Power Stroke Problems & Symptoms

1. CP4 High-Pressure Fuel Pump Failure (2011–2019)

Symptoms:

• Sudden crank/no-start or stalling
• Loss of power with fuel system codes (e.g., P0087 – low fuel rail pressure)
• Metal shavings found in the fuel filter or fuel system

Causes:

• The Bosch CP4.2 pump is sensitive to poor fuel quality, water contamination, and low-lubricity diesel
• A single lean-fuel event can score the pump internals and send metal debris through the injectors, rails, and lines

Fixes:

• Install a CP4 bypass/disaster prevention kit to protect the fuel system before failure
• Convert to the updated DCR-style pump used on 2020+ trucks
• If the pump has already failed, complete fuel system replacement (pump, injectors, rails, lines) to remove all debris
• Shorten fuel filter intervals and use a quality lubricity additive

2. Turbocharger Problems (Especially 2011–2014)

Symptoms:

• Loss of power or slow spool
• Whining, whistling, or grinding from the turbo
• Excess smoke or turbo-related fault codes

Causes:

• Early trucks used a dual-compressor-wheel turbo with ceramic ball bearings that don't hold up to hard use
• Oil contamination and extended oil change intervals accelerate bearing wear

Fixes:

• Upgrade early trucks to the stronger 2015+ style turbocharger or a proven aftermarket drop-in
• Address oil feed/drain issues and stay on top of oil service
• Full inspection of the charge air system while the turbo is out

3. EGR Cooler Clogging & Leaks

Symptoms:

• Unexplained coolant loss with no visible leak
• White smoke from the exhaust
• Running hot under load

Causes:

• Soot and carbon buildup restrict the cooler over time
• Thermal stress cracks the cooler core, letting coolant into the exhaust stream

Fixes:

• Replace with an updated or upgraded EGR cooler
• Clean the EGR valve and intake tract while the system is apart
• Cooling system service to protect the new cooler

4. DPF / DEF Emissions System Trouble

Symptoms:

• Frequent or incomplete regens
• “Exhaust Filter Full” messages or reduced-power derates
• NOx sensor, EGT sensor, or DEF system fault codes

Causes:

• Short trips and idle time load the DPF with soot faster than it can regenerate
• Failed sensors, a clogged DPF, or DEF system faults trigger limp mode
• Upstream problems (injectors, turbo, EGR) often overload the aftertreatment system

Fixes:

• Proper diagnosis of the root cause before replacing parts
• Forced regeneration or professional DPF cleaning/replacement
• Replace failed NOx/EGT sensors and DEF components with quality parts
• Fix upstream engine issues so the new parts last

5. Coolant Leaks & Cooling System Wear

Symptoms:

• Low coolant warnings or frequent top-offs
• Coolant smell or visible weeping at the radiator
• Overheating while towing

Causes:

• Primary radiators on these trucks are known to develop leaks with age
• Degas bottles, hoses, and water pumps wear out under heavy-duty cycles

Fixes:

• Pressure-test the system to pinpoint the leak
• Replace the radiator with an updated unit
• Complete cooling system service so the truck is ready to tow

How Deer Park Diesel Fixes the 6.7L Power Stroke

We keep 6.7L Power Strokes strong  for towing, work, and daily driving in the Pacific Northwest:

• CP4 bypass kits and DCR pump conversions
• Complete fuel system replacements after pump failure
• Turbocharger upgrades for early trucks
• EGR cooler replacement and intake cleaning
• DPF/DEF diagnosis, cleaning, and repair done right the first time
• Cooling system repairs and radiator upgrades
• Trusted aftermarket parts from the performance brands we carry
• Repairs backed by the DPD Warranty

Schedule Your 6.7L Power Stroke Diagnostic in Clayton, WA

If your 6.7L Power Stroke is losing power, using coolant, or throwing fuel system or emissions codes, get it diagnosed before a small problem becomes catastrophic. Bring it to Deer Park Diesel for expert diagnostics, repair, and upgrade options.

Serving Clayton, Deer Park, Spokane, Nine Mile Falls, Loon Lake, Chewelah, and Colville.