1999-2025 Ford F-250 Super Duty Problems & Issues

The EGR (Exhaust Gas Recirculation) cooler on 2011-2019 6.7L Power Stroke diesel engines is prone to clogging with soot and eventually failing, particularly on trucks used for highway driving, light loads, or trucks that idle extensively. The EGR cooler recirculates cooled exhaust gas back into the intake to reduce NOx emissions. Over time, soot accumulates in the cooler's internal passages and restricts exhaust gas flow through the cooler core, and a cooler that overheats can fail. When it fails, exhaust gases enter the coolant system, causing overheating and "puking" coolant from the degas bottle. The 2011-2014 models are particularly susceptible due to narrow internal coolant passages. Ford TSB 13-6-5 (superseding 12-6-14) covers 2011-2012 6.7L trucks with DTC P0401 and P2457, calling for EGR cooler core replacement under normal New Vehicle Limited Warranty coverage. The EGR cooler for 2011-2016 is OEM part BC3Z-9V425-A; 2017+ is HC3Z-9V425.

The 2011-2016 6.7L Power Stroke uses a Bosch CP4.2 high-pressure fuel pump, which is lubricated by the diesel fuel passing through it. When the pump wears internally, it sheds metal particles. The pump feeds fuel to the injectors at very high pressure, so those particles can be carried into the injectors, fuel rails, high-pressure lines and the return side of the system. A diesel parts seller describes some early CP4 failures as sudden ("grenade") failures that send debris through the whole fuel system, and says flushing and cleaning will not restore it. Owners have sued Ford over the pump. The lawsuits claim the CP4 design is fragile and incompatible with U.S. diesel fuel, which they describe as low in lubricity, and that Ford knew this and did not disclose it. Ford disputes that the pump is defective. It says the pump was adequately designed and tested, and that failures can come from causes such as contaminated fuel. In Droesser v. Ford (E.D. Mich., No. 2:19-cv-12365), the court certified classes in California, Louisiana, Ohio, Pennsylvania and South Carolina on September 30, 2026. The classes cover owners of 2011-and-later 6.7L trucks who paid out of pocket for a CP4 repair. That ruling does not find Ford liable, and there is no settlement, payment amount or claim process yet. Once metal has spread, the repair usually means replacing the pump, injectors, rails and lines. One diesel shop reports that dealer bills for this job routinely run $8,000 to $12,000.

The 2011-2014 6.7L Power Stroke uses a Honeywell DualBoost variable geometry turbocharger with ceramic bearings that proved unreliable in real-world use. The ceramic bearings fail prematurely, especially under hard towing use or when oil change intervals are stretched. The variable geometry turbo's complex actuator mechanism also sticks or fails. When the turbo fails, it is unmistakable: a deafening screeching sound accompanied by smoke from the tailpipe as the engine burns oil through the failed turbo seals. Ford recognized the early turbo design was problematic and switched to a single-compressor-wheel variable geometry turbocharger in 2015, which is significantly more reliable. Retrofit kits for 2011-2014 trucks are available.

For the 2005 model year Ford revised the 6.0L's high-pressure oil pump and introduced a two-piece 'snap-to-connect' (STC) fitting on the HPOP branch tube. The two-piece fitting flexes with engine movement, wearing the internal seal and the locking ring until high-pressure oil leaks past it - or until the fitting separates outright. Because the HEUI injectors need roughly 500 psi of oil rail pressure to fire, the truck develops the classic pattern owners describe on the forums: it starts fine cold, then hot restarts get progressively longer, then one day it will not start at all after a fuel stop. It is one of the most common no-start causes on 2005-2007 trucks and is frequently misdiagnosed as injectors, a bad HPOP, or standpipes/dummy plugs (which fail with the same symptom set).

The early 2-valve Triton aluminum heads used in the gas Super Duty carry only about four threads in the spark plug bore. Combustion pressure and heat cycling gradually pull those few aluminum threads until the plug backs out and is ejected from the head, often taking the coil-on-plug boot with it. Owners describe a gunshot bang followed by an instant severe misfire and an exhaust-like roar from under the hood. It is the defining failure of the pre-3-valve Triton engines and affects the 6.8L V10 and the 5.4L V8 in the same way. Ford addressed it with a revised head design carrying substantially more thread engagement, so later trucks are not exposed.

The 2003-2007 6.0L Power Stroke uses only four torque-to-yield head bolts per cylinder to clamp the cylinder heads to the block. Under high cylinder pressure - towing, hot ambient temperatures, a stuck VGT turbo, or any power tuning - the TTY bolts stretch, clamping load falls off, and the head momentarily lifts off the block. Combustion gases are pushed into the cooling system and coolant is pushed into the cylinders. This is the failure that defines the 6.0's reputation and it is very often a downstream consequence of a plugged oil cooler and a failed EGR cooler rather than a standalone defect - the cooling system is already compromised by the time the gasket goes. Owners see the degas bottle pressurize and overflow, white sweet-smelling steam at the tailpipe, and coolant level dropping with no external leak.

Internal EGR-cooler leakage can cause coolant loss, white exhaust and exhaust gas entering the cooling system on a 6.0L Power Stroke. Coolant ingestion may cause hydrolock. Similar symptoms can arise from other cooling faults, so symptom matching alone is insufficient.

The Selective Catalytic Reduction (SCR) system on 2015-2022 6.7L Power Stroke trucks - which uses Diesel Exhaust Fluid (DEF) to reduce NOx emissions - is prone to failure, most commonly triggering DTC codes P207F (Reductant Quality Performance) and P20EE (SCR NOx Catalyst Efficiency Below Threshold). Causes include degraded or crystallized DEF fluid (DEF has a shelf life of 1-2 years and degrades faster in heat), a failed DEF injector, SCR catalyst failure, DEF quality sensor failure, or NOx sensor failure. In limp mode, the truck's performance is severely limited. The system is complex and diagnosis requires a professional scan tool. The DEF injector is a particularly common failure point on 2017+ trucks.

Certain early-build three-valve engines can retain part of a spark plug in the head during removal. This differs from plug ejection. Identify the installed engine, head and plug design before service; vehicle model year alone is insufficient.

The 6.0L's engine oil cooler is a coolant-to-oil plate cooler with extremely narrow coolant passages, and it sits first in the coolant path ahead of the EGR cooler. Casting sand, silicate dropout from the factory gold coolant, and general debris pack those passages solid. Once restricted, oil temperature climbs away from coolant temperature and, critically, coolant flow to the EGR cooler is starved - which is why the EGR cooler and then the head gaskets fail next. The diagnostic that owners and shops use is the delta between EOT and ECT: an oil temperature consistently more than about 15-20 degrees F above coolant temperature during unloaded highway cruising indicates the cooler is plugging (a larger spread under heavy towing load can be normal). This is a maintenance-driven failure on nearly every high-mileage 6.0 and is the single most important item to address before anything else on the engine.

The factory radiator on the 2008-2010 6.4L Power Stroke uses plastic end tanks crimped to an aluminum core. The crimps work loose and the tank-to-core seal separates, so the radiator begins seeping and then dumping coolant - typically down the driver's side. It is one of the most reported non-engine failures on this truck and it frequently strikes well inside 100,000 miles; forum threads document dealers confirming failed tank seals at around 60,000 miles with no warranty assistance and quoting the owner four figures. Because the 6.4 already runs two separate cooling circuits and is heat-sensitive, ignoring it risks overheating and piston damage.

On the 1999-2003 7.3L Power Stroke the camshaft position sensor is the PCM's only engine-position input. When it fails the PCM no longer knows when to fire the injectors and the engine simply shuts off - often at speed, with no warning and no check engine light. It may restart after cooling and then die again, or it may not restart at all. The classic confirmation on 1999-2001 trucks is a tachometer that stays dead while cranking. Forum consensus on ford-trucks.com and the diesel boards treats a spare CPS in the glovebox as standard equipment on these trucks, which tells you how routine the failure is. It does not always set a code, which is why it is so often misdiagnosed as a fuel or IDM problem.

The Fuel Injection Control Module on the 2003-2007 6.0L steps 12 volts up to the roughly 48 volts the HEUI injector solenoids need. The module is mounted on the driver's side valve cover where it lives in constant heat and vibration, and its power-supply section degrades - almost always accelerated by weak or mismatched batteries, which the module hates. As FICM output sags the injector solenoids fire late and unevenly. Healthy output measured at the module is 47-49 volts; anything in the 36-45 volt range is a failing module, and below about 45 volts the truck typically will not start cold. Owners describe long cranking overnight, a shaking lopey idle that cleans up as the engine warms, and white smoke on startup - symptoms that are commonly and expensively misdiagnosed as injectors.

The speed control deactivation switch threads into the brake master cylinder and is electrically live at all times, even with the key out and the truck parked. Brake fluid migrates past the internal diaphragm into the electrical side of the switch, where it corrodes and short circuits the contacts. The switch overheats, smokes and can ignite an underhood fire on a parked, unattended vehicle. Ford recalled these switches across a very large family of vehicles built from the 1990s into the mid-2000s; for the Super Duty, NHTSA campaign 07V-078 (Ford 05S28, announced March 2007, about 155,584 vehicles) covers 2003 F-250/F-350/F-450/F-550 Super Duty trucks with gasoline or natural gas engines built 08/01/2002 to 01/06/2003, the earlier 05S28 campaign 06V-286 covers 1994-2002 F-250/F-350 and F-450/F-550 trucks with gasoline or natural gas engines, and campaign 09V-399 (Ford 09S09) covers 1999-2003 F-250 through F-550 Super Duty diesels. Coverage was assigned by VIN, not by model year alone.

To regenerate the diesel particulate filter, the 2008-2010 6.4L injects fuel late in the cylinder rather than through a downstream dosing injector. That post-injection fuel washes down the cylinder walls and ends up in the crankcase. On trucks used for short trips or lots of idling, where regens start but never complete, the oil level climbs above the full mark - owners routinely report draining an extra gallon at a normal oil change and oil that smells like diesel and feels thin. Diluted oil loses its film strength and takes out main and rod bearings, the turbochargers and the valvetrain, which is why this quiet problem is behind a large share of 6.4 engine failures. It is a design characteristic of this engine's emissions strategy, not a defect of any one truck.

Each 6.0L HEUI injector contains a spool valve that is shifted by two electric coils and controls the high-pressure engine oil that fires the injector. Oil varnish, coking and wear cause the spool to stick - 'stiction' - so the injector cannot respond to the FICM's command quickly enough. The signature is unmistakable to owners: a hard cold start followed by a shaking, misfiring, smoky idle for the first few minutes that disappears once the oil warms and thins. Cylinder contribution and injector on-time data will show one or more cylinders far out of range. Extended oil change intervals and the wrong oil grade accelerate it, and the 6.0's oil is doing double duty as hydraulic fluid, which is why oil quality matters far more here than on a conventional diesel.

The 5R110W TorqShift automatic behind the 6.0L and 6.4L Power Stroke diesels and the 6.8L V10 in Super Duty trucks is a strong unit, but its stamped-steel torque converter with a single-disc lockup clutch is the weak link. Heat from towing, added horsepower, or fluid that was never changed cooks the lockup clutch lining. When the converter fails it does not fail cleanly - it sends clutch material and steel debris through the entire transmission, contaminating the valve body, the shift solenoids and the cooler circuit, so a converter failure typically takes the transmission with it. Owners first notice a shudder or vibration at lockup speeds, then harsh or erratic 3-4 and 4-5 shifts, then slipping. Solenoid faults and hard shifts on these trucks are frequently the downstream symptom of debris rather than an independent problem.

The 6.7L Powerstroke diesel engine exhaust manifold studs are prone to breaking due to thermal cycling. The extreme heat cycles of the diesel exhaust cause the studs to fatigue and snap, creating an exhaust leak at the manifold-to-head junction. This produces a ticking noise on cold starts that may diminish when warm, exhaust smell in the cabin, and can trigger check engine lights for exhaust leaks. The driver side manifold is more commonly affected.

The 1999-2003 7.3L routes exhaust from each head to the turbo through two up-pipes sealed with crush-type 'donut' gaskets, one of which is buried under the engine in an awkward position. Constant heat cycling and expansion blow those gaskets out, so exhaust escapes before it reaches the turbine. The truck loses boost and power, exhaust gas temperatures climb, fuel economy falls off, and a distinct hissing or ticking appears under the cab that rises with load. The turbo pedestal O-rings and the exhaust back pressure valve in the pedestal leak in the same area and cause overlapping symptoms, so the two are usually addressed together.

The factory steering damper on the F-250 Super Duty wears out and fails, leading to increased steering shimmy, vibration at highway speeds, and reduced ability to dampen road imperfections. The single factory damper is often inadequate for the weight and solid front axle of the Super Duty. A worn damper does not cause death wobble directly but removes the last line of defense against oscillation. Most factory dampers are worn out by 50,000-80,000 miles.