[Ronnie79]

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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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.

[Ronnie79]

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?

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Do you think the car has a remap right now?

There is a LOT of junk out there

[Ronnie79]

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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Originally Posted by Ronnie79

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.

[Ronnie79]

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.