10-26-2020, 11:32 AM | #1 |
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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.. |
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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10-28-2020, 11:14 AM | #6 |
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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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02-16-2021, 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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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:
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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-2019 M2 Competition MT, Alpine White. Self-tuned 560hp -2016 Mini Cooper S, MT. Many plans. Others: -E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe. |
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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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04-19-2022, 09:32 AM | #17 | |
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Quote:
Problem solved ? I have the same problem. |
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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:
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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247500, high revs, n47, rail pressure |
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