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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > Error 247500 - Rail Pressure too low at high revs and full throttle
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      10-26-2020, 11:32 AM   #1
Bero
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Question Error 247500 - Rail Pressure too low at high revs and full throttle

I'm having a drive train error message om my 318d 2014.

Error Code 247500 - Rail Pressure Plausibility Quantity Controlled, Rail Pressure Too Low/ Positive control deviation.

Triggers sometimes under heavy acceleration beyond 3000 revs.

When I check live data at full throttle above 3000 rpm the actual rail pressure deviates from the specified value,
The actual pressure is about 5-10% lower, only at full throttle and high revs.
The HPP, pressure regulator and sensor has been changed.

Fuel filter changed and pre pressure is the same (3.9) no matter what.

Any ideas? Pressure regulator or a remap maybe?

Last edited by Bero; 02-18-2021 at 10:29 AM..
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      10-26-2020, 03:48 PM   #2
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The pressure regulation valve on the rail sometimes causes this problem.

I would look at the metering unit on HPFP (if it's second hand) or the rail control valve.


A very poor remap can do that as well.
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      10-27-2020, 10:25 AM   #3
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I fitted a brand new genuine high pressure fuel pump including the quantity control valve that is on the HPFP.

Last edited by Bero; 02-18-2021 at 10:24 AM..
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      10-27-2020, 05:45 PM   #4
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Do you think the car has a remap right now?

There is a LOT of junk out there
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      10-28-2020, 02:31 AM   #5
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Yes, it is optimized and remapped at a tuning company to 190 hp.

Last edited by Bero; 02-18-2021 at 10:25 AM..
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      10-28-2020, 11:14 AM   #6
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Quote:
Originally Posted by Ronnie79 View Post
Yes, according to the previous owner it was "optimized" and remapped at a tuning company to have similar power as the 320d.

It has this error code since I bought it 6 months ago.
If possible, I would revert back to stock flash (use esys to overwrite or update the DDE), and then test for a while.
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      01-05-2021, 06:36 AM   #7
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Now I have also changed the fuel pressure regulator, still no luck. any other ideas?

What do I need to revert it back or modify the map my self? What kind of hardware and software do I need?

I have worked with a few different aftermarket fuel injections in the past mapping performance cars but I find it a bit confusing with this. All I find is how to remap etc but not how to actually get there, how to connect to the ecu etc.
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      02-15-2021, 08:16 AM   #8
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Could a leaking injector cause this problem?
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      02-16-2021, 02:13 AM   #9
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Red face

Any ideas, please?

Last edited by Bero; 02-18-2021 at 10:29 AM..
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      02-16-2021, 09:46 AM   #10
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I would go back to stock, unmodified tune. When the tune is tampered with, anything can happen.

Got a Windows laptop and an enet cable?
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      02-16-2021, 04:03 PM   #11
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Yes, maybe that's the way to go.

But I just had another idea, maybe it is the opposite way. Maybe a faulty DPF or sensor is causing the problem and the ECU lowers the rail pressure and triggers the 247500 Rail pressure too low fault? 🤔

Because of this theory I'm now thinking about doing a DPF delete instead to see if that helps first.

Previously I used an enet cable but now I use a more advanced cable, don't remember the name, combined with a delphi diagnostic software on a windows laptop.

Last edited by Bero; 02-18-2021 at 10:32 AM..
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      02-16-2021, 04:40 PM   #12
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Quote:
Originally Posted by Ronnie79 View Post
Because of this theory I'm now thinking about doing a DPF delete instead to see if that helps first.
This is a very poor way to go about diagnosing... Just go back to stock.
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      02-16-2021, 04:45 PM   #13
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Quote:
Originally Posted by Ronnie79 View Post
Yes, maybe that's the way to go.

But I just had another idea, maybe it is the opposite way. Maybe a faulty DPF or sensor that throws the codes other codes 258400 Exhaust temperature sensor and 260900 Unknown that is causing the problem and the ECU lowers the rail pressure and triggers the 247500 Rail pressure too low fault? 🤔

Because of this theory I'm now thinking about doing a DPF delete instead to see if that helps first.

Previously I used an enet cable but now I use a more advanced cable, don't remember the name, combined with a delphi diagnostic software on a windows laptop.
Don't do all that.

I had asked if you have an enet cable and a windows laptop, as we can schedule a time to remote in and take a look at it, revert to stock, etc. No advanced cables needed, no aftermarket programs needed.

ENET is *the* cable for these. It's basically a LAN cable to connect the car and the laptop, creating a network between the two. That's the factory way.
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      02-17-2021, 02:54 AM   #14
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Aha, okay. I misunderstood what an ENET cable is, I thought it was another kind of OBDII to USB cable that I previously had.

Alright! Time for me to buy an ENET cable then!
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      03-05-2022, 10:06 AM   #15
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Quote:
Originally Posted by Bero View Post
Aha, okay. I misunderstood what an ENET cable is, I thought it was another kind of OBDII to USB cable that I previously had.

Alright! Time for me to buy an ENET cable then!
Were you able to fix it? What was it?
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      04-11-2022, 02:17 PM   #16
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Bero, did you ever manage to fix this? Pretty much exact same situation
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      04-19-2022, 09:32 AM   #17
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Quote:
Originally Posted by Bero View Post
I'm having a drive train error message om my 318d 2014.

Error Code 247500 - Rail Pressure Plausibility Quantity Controlled, Rail Pressure Too Low/ Positive control deviation.

Triggers sometimes under heavy acceleration beyond 3000 revs.

When I check live data at full throttle above 3000 rpm the actual rail pressure deviates from the specified value,
The actual pressure is about 5-10% lower, only at full throttle and high revs.
The HPP, pressure regulator and sensor has been changed.

Fuel filter changed and pre pressure is the same (3.9) no matter what.

Any ideas? Pressure regulator or a remap maybe?



Problem solved ? I have the same problem.
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      09-11-2023, 10:48 PM   #18
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was anyone able to solve this? please do let me know. recently changed fuel feed line and fuel pressure regulator too.
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      02-05-2024, 02:09 PM   #19
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Did anyone manage to get this issue resolved? I have exactly the same issue that became apparent after a remap (unicorn motor developments so a 'good' remap!)

Am looking to get booked in for a new fuel pump but am scared that this will not resolve the issue
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      02-06-2024, 03:16 PM   #20
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Quote:
Originally Posted by Dan_430D View Post
Did anyone manage to get this issue resolved? I have exactly the same issue that became apparent after a remap (unicorn motor developments so a 'good' remap!)

Am looking to get booked in for a new fuel pump but am scared that this will not resolve the issue
Your first move should be to call Unicorn. Rick is well regarded, and knows BMW engines inside and out. I wouldn’t start replacing components ad-hoc.

If a problem only appears after changes have been made, i.e. a remap or significant hardware changes, it’s extremely likely that there’s a cause-effect link.
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