6.7 Powerstroke Repair for Fuel, Emissions and Cooling Faults
6.7 Powerstroke repair usually comes down to five systems: the CP4.2 fuel pump, the EGR cooler, the DPF, the DEF and SCR side, and two separate cooling loops. Faults on one system often set codes on another, so we find which one is actually failing before a part gets ordered.
What Ford changed when the 6.7 showed up
The 6.7 replaced the 6.4 for the 2011 Super Duty and was the first Powerstroke Ford designed and built in-house instead of buying from Navistar. It moved to a Bosch CP4.2 pump, put the turbo in the valley between the heads, and added DEF and SCR to the EGR and DPF the 6.4 already carried.
That hardware, not the bottom end, is what brings most 6.7 trucks in.
| System | What the 6.7 runs |
|---|---|
| Years | 2011 Super Duty and newer |
| High-pressure fuel | Bosch CP4.2 common rail, 2011 and newer |
| Turbo | Mounted in the valley between the cylinder heads |
| Cooling | Main engine loop plus a separate low-temperature loop |
| Emissions | EGR cooler, DPF, SCR with DEF, NOx sensors |
| Transmission | 6R140 six-speed 2011 to 2019, 10R140 ten-speed 2020 and newer |
Where the 6.7 Powerstroke gives trouble, system by system
Pick a system to see what fails and what you notice from the driver's seat.
The pump that can take the injectors with it
The CP4.2 needs clean diesel with enough lubricity to protect itself. Water, air or poor fuel wears it, and a worn pump sheds metal toward the rails and injectors. See diesel fuel system repair.
- Hard start or crank, no start
- Dying under load
- Glitter in the fuel filter
Coolant where coolant should not be
The EGR cooler runs hot exhaust through a coolant jacket. When it leaks inside, coolant leaves through the tailpipe and the bottle drops with no puddle. A plugged cooler sets flow codes instead. See EGR cooler replacement.
- Coolant dropping, no outside leak
- Sweet-smelling white smoke
- EGR flow codes
A filter that tells on the rest of the engine
The DPF traps soot and burns it off in regens. Short trips, idling or an engine making extra soot fill it faster than it cleans, so a plugged DPF often points to an injector, EGR or turbo problem upstream. See DPF repair.
- Exhaust filter messages
- Regens that never finish
- Low power and poor mileage
The part of the 6.7 that counts down
The 6.7 has carried DEF and SCR since 2011. Bad fluid, a failed heater or pump, a crusted doser or a lazy NOx sensor all end in a countdown toward reduced speed. DEF freezes near 12 degrees Fahrenheit, so heater faults arrive with the first cold snap. See DEF system repair.
- DEF quality messages
- A speed-limit countdown
- NOx sensor codes
Two loops, two places to run hot
Besides the main engine loop, the 6.7 runs a separate low-temperature loop that cools the charge air and fuel coolers. Either loop can leak or lose flow, and a weak low-temp loop often shows up as lost power before the gauge moves. See truck overheating repair.
- Temperature climbing on a pull
- Coolant loss from one reservoir
- Coolant smell after a hard run
What your 6.7 is doing, and whether to keep driving it
Some can wait a few days. One ends the drive right there.
| What you notice | Keep driving? | Where we start |
|---|---|---|
| Dies under load, will not restart, rail pressure codes | No. Tow it in. More cranking can spread pump debris. | The fuel filter for metal, then rail pressure. |
| Coolant dropping, white smoke at startup | No. Park it and call us. Coolant in the intake can damage the engine. | A pressure test and an EGR cooler check. |
| Countdown to a speed limit | Yes, straight to the shop. | DEF quality, then the NOx sensors and the SCR. |
| Regens all the time, low power | Yes, gently, and skip the trailer. | Soot load, then what upstream makes the soot. |
| Temperature rising on grades | Not on the grade. Pull over and let it cool; if the gauge keeps rising, shut it off. | Both cooling loops and the fan. |
| Flashing tow/haul light or harsh shifts | Easy driving only, no towing. | Transmission codes and fluid. |
Symptom not listed? Our diesel diagnostics start from what the truck is doing.
A pump failure on a 6.7 is a fuel system job
A failed CP4.2 rarely stays a pump problem. Its metal can sit in the rails, lines and injectors, and a new pump on a dirty system can fail the same way. We find how far the metal went before we price anything. More on our diesel injection pump repair page.
- Inspect the fuel filters for metal
- Check the tank for water or wrong fuel
- Compare actual and commanded rail pressure
How these pumps fail and how to protect one: Ford 6.7 Powerstroke CP4 failure.
The 6.7 work that comes through our bays
What we fix most often on this engine.
CP4.2 pump and DCR conversion
A failed CP4.2 replaced with a more reliable DCR pump conversion, plus rails, lines and injectors when debris reached them.
Injectors and fuel delivery
Testing and replacement when an injector leaks or sticks.
EGR valve and cooler
Leak tests, cooler replacement and soot cleanup.
DPF and regen faults
Sensor checks, forced regens, cleaning or replacement.
Cooling system work
Leaks, pumps and thermostats on both loops.
We do not do delete work. Every 6.7 emissions repair leaves the system working as Ford built it.
A towing company that keeps coming back
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- Customer
- Woody Boyd
- Job
- Work before a towing trip
I was under time pressure to get some work done on my truck prior to leaving for a trip. They did a fine job getting the work done (and reworking a bunch of problems that another shop didn’t solve or created) and the truck ran very well pulling my boat to Tennessee. I will continue using them because they give me confidence the truck will run right.5 STARS
How a 6.7 Powerstroke job moves through the shop
Same order on every truck.
Hear the whole story
When it started, what you were pulling and what was already replaced.
Scan and test
OEM factory scan tools, pressure tests and a road test.
Look at the rest
Soot and coolant problems on this engine often have a partner.
Call you first
What needs attention now, what can wait. Nothing starts without your approval.
How Colorado driving shows up on a 6.7
Plenty of 6.7 trucks here pull campers and equipment up I-70. That work exposes a tired cooling loop or hot transmission fluid fast, and cold mornings test the DEF heaters.
- Long grades with a load: watch the gauges
- Below-freezing nights: DEF heater faults appear
- Short trips: the DPF fills faster than it cleans
Most 6.7 work is drop-off, and we call you once we know what failed.
Tell us what your 6.7 Powerstroke is doing
Send the year, the engine and what you are seeing, and we'll get back to you as quickly as we can.
- Year, make and engine
- What it is doing, and when it started
- Any codes or recent repairs
Rather talk it through? Call (303) 808-1563
6.7 Powerstroke questions from owners
What people ask before they bring a 6.7 in.
Not necessarily. Many run a long time on clean fuel and regular filter changes. Water, air and poor fuel are what hurt it. If you are worried about it, we can replace your CP4 with a more reliable DCR pump.
An internal leak, often the EGR cooler, sends coolant out the exhaust. A pressure test usually finds it. Do not keep topping it off and driving.
No. We do not do delete work. We repair the EGR, DPF and SCR systems and leave them in place.
Trucks from 2011 to 2019 use the 6R140 six-speed. 2020 and newer trucks use the 10R140 ten-speed. We work on both, and we scan for codes and check the fluid before recommending a repair.
Diagnosis typically takes 24 to 72 hours depending on workload. Repair time depends on what we find and on parts.
6.7 throwing codes or losing coolant?
Call with the year, the mileage and what the dash says, or use Request Service to send the details. Or drop us a line right here from the website and we'll get back to you as quickly as we can.