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Hello, I recently bought a 2011 f350 6.7. It had a code p228f which read “exceeding learning limits too high”. To my understanding it was the fuel rail pressure sensor on the back side of the rail closest to the drivers seat. I replaced it and cleared the code on my mini maxx. As soon as I started the truck the p228f code came back along with another code p0191 “fuel rail pressure sensor circuit range/performance”. The other day the truck went into power reduced mode. I limped it home then the truck started loping so I put it in neutral and revved it and it went away and I parked it. I don’t know if another sensor went bad or what. Any advice will help. Thanks
Not to be the bearer of bad news but, You might want to pull the return lines from the fuel pump and check to see if there is any debris. The CP4 pump is an open system which supplies fuel to the pump heads via the fuel in the crankcase of the pump. If the cam starts to wear it will push fine metal particles into the fuel rails and destroy the injectors. Usually these codes can be a precursor to complete failure.
Since you have a sensor out, check it real close to see if there is any metal in it, it will be dust fine.
Not to be the bearer of bad news but, You might want to pull the return lines from the fuel pump and check to see if there is any debris. The CP4 pump is an open system which supplies fuel to the pump heads via the fuel in the crankcase of the pump. If the cam starts to wear it will push fine metal particles into the fuel rails and destroy the injectors. Usually these codes can be a precursor to complete failure.
Since you have a sensor out, check it real close to see if there is any metal in it, it will be dust fine.
I checked the sensor. It was a Bosch, I replaced it with motor craft. The tip of it was brown. Looked rusty. Maybe I should change the fuel filters as well and see how they look
I checked the sensor. It was a Bosch, I replaced it with motor craft. The tip of it was brown. Looked rusty. Maybe I should change the fuel filters as well and see how they look
That does not sound good, the part the fuel touches should be clean as the day it was installed. Double check that its not a plastic part that goes in the rail and just aged brown. I don't know what the sensor looks like, but I assume it has a hole in it. See if you can get a cotton swab in it or something that can clean inside it and see if there is any junk. The HPFR should be pristine.
That does not sound good, the part the fuel touches should be clean as the day it was installed. Double check that its not a plastic part that goes in the rail and just aged brown. I don't know what the sensor looks like, but I assume it has a hole in it. See if you can get a cotton swab in it or something that can clean inside it and see if there is any junk. The HPFR should be pristine.
it’s similar to the ipr sensor for the 7.3. It is the plug that has the threaded part and the tip is a nipple with holes if that makes sense
Try this doc, I think the part you are referring to is the one pictured troubleshooting doc It might pop an error as unsafe, open it in your browser, it's a PDF that opened OK for me.
Try this doc, I think the part you are referring to is the one pictured troubleshooting doc It might pop an error as unsafe, open it in your browser, it's a PDF that opened OK for me.
Yes. Figure 3 A is the part I replaced it was the same rust color and everything.
the truck is also deleted and the egr is unplugged but not removed. Has the minimaxx tuner as well that is in the stock tune. Maybe that has something to do with it. I was thinking maybe the icp sensor is bad because that is the sensor that comes up when I google the code p0191
Last edited by joeshack991; Aug 8, 2022 at 10:23 AM.
That right there is the scary part about owning these diesel today. First thing I will do when I get a replacement truck is install the fuel pump bypass so if the pump does take a schiznit from water, at least it wont get into the HP fuel system.
First I would drain the DFCM ( the frame primary pump/filter) and see if you get any water. I would pull off the intake manifold to get to the HPFP. That first pic is the fuel pressure control valve. If you see on the valve and in the fuel pump body what you see in these pics, you have problems.
Hello, I recently bought a 2011 f350 6.7. It had a code p228f which read “exceeding learning limits too high”. To my understanding it was the fuel rail pressure sensor on the back side of the rail closest to the drivers seat. I replaced it and cleared the code on my mini maxx. As soon as I started the truck the p228f code came back along with another code p0191 “fuel rail pressure sensor circuit range/performance”. The other day the truck went into power reduced mode. I limped it home then the truck started loping so I put it in neutral and revved it and it went away and I parked it. I don’t know if another sensor went bad or what. Any advice will help. Thanks
recentrly bought? from a used car dealer? any "30 day warranties" or the like. try to transfer this problem to the dealer if there is a dealer.
this is going to be a lot of work and analisys.....
recentrly bought? from a used car dealer? any "30 day warranties" or the like. try to transfer this problem to the dealer if there is a dealer.
this is going to be a lot of work and analisys.....
i bought the truck on Facebook marketplace for $15,000. It ran good until the check engine light came on. It stalled at a low speed after driving around for a while then started up and drove fine again. After I changed the sensor on the rail the other code came up “p0191” and then the code p228f came up again but says unknown dtc instead of control flow high. I’m thinking it’s the sensor on one of the filter lines going towards the engine that is bad. I took it out and it had very little rust on it. The sensor on the rail was brown but none of it had flakes or anything. I’m gonna try to get that sensor out under the manifold to see if there are any flakes and if there is the truck is going for sale unfortunately
After I changed the sensor on the rail the other code came up “p0191” and then the code p228f came up again but says unknown dtc instead of control flow high. I’m thinking it’s the sensor on one of the filter lines going towards the engine that is bad. I took it out and it had very little rust on it. The sensor on the rail was brown but none of it had flakes or anything.
The sensors you are referring to are your low pressure side fuel pressure sensor and your fuel temperature sensor, both of which have pretty specific codes and you'd know if they were the problem.
"very little rust" is still rust. Which means youve had water go through your system which ultimately could mean your CP4 is the culprit. That metering valve will serve as your black box I guess.
Depending on miles and trim, you might be able to sell your mechanics special for close to what you paid for it
That right there is the scary part about owning these diesel today. First thing I will do when I get a replacement truck is install the fuel pump bypass so if the pump does take a schiznit from water, at least it wont get into the HP fuel system.
Fixed that for you. They are the only ones to stick with the CP4 in their HD pickups.
diesel today. First thing I will do when I get a replacement truck is install the fuel pump bypass so if the pump does take a schiznit from water, at least it wont get into the HP fuel system.