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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, 12:32 PM   #1
Ronnie79
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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 F31 318d 2013.

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

Triggers under heavy acceleration beyond 3000 revs, happens every time apart from when the engine hasn't fully reached normal temperature.

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.
This made me think it was the high pressure pump, I therefore changed the HPP but still the same error.
Also changed the rail pressure sensor, no luck.
Fuel filter changed and pre pressure is the same (3.9) no matter what.

Any ideas? Pressure regulator or a remap maybe?
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      10-26-2020, 04:48 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, 11:25 AM   #3
Ronnie79
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I fitted a brand new Bosch high pressure fuel pump including the quantity control valve that is on the HPFP.

The only thing I haven't changed is the rail pressure regulator that is on the fuel rail itself. Would you start with a remap or change the rail pressure regulator?

Last edited by Ronnie79; 10-27-2020 at 03:32 PM..
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      10-27-2020, 06:45 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, 03:31 AM   #5
Ronnie79
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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.
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      10-28-2020, 12:14 PM   #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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