F3X Diagnosing faulty LPFP vs. EKP vs. HPFP

amerikanist

New Member
Feb 24, 2023
3
0
0
Hello fellow BMW enthusiasts!

I am running into an issue with my F32 randomly going into a limp mode and shutting down the engine shortly after. In the majority of cases, I am able to start the engine and drive after clearing the error memory.

These are all the errors from different incidents:

11A002: High fuel pressure, plausibility: pressure too low
110001: Cylinder injection shutdown: catalyst protection due to too low pressure in the fuel system
481B03: Motor current too low
11A401: High fuel pressure when injection is released: Pressure too low
11B401: High fuel pressure during or after the injection is released (2nd environmental condition sentence after time delay): Pressure too low
21A023: Combustion engine: false start or engine stopped without driver influence

After googling for a while, it was my understanding that the HPFP is the culprit and I started looking for alternatives to replace the stock one with figuring out stage 1 dorch engineering one would be the best starting point (considering I have bm3 license and will be able to code it).

Everything else in the 435i is currently OEM, no other upgrades.

Reached out to dorch engineering and they were very positive HPFP is not the reason (quote “HPFP issues are non-binary and do not get resolved by simply clearing the memory”) and that it was likely EKP or LPFP suggesting I diagnose them somehow and replace either of them.

Can anyone vouch on the best practice in this case? How do I figure out what’s causing it and what I should be looking at replacing first?

Taking the vehicle to the dealership did not result in any solution as they were not able to reproduce the issue (as dumb as this explanation is considering I have all logs saved for them).

Any help would be appreciated.
 

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mfractal

Specialist
Nov 10, 2017
80
27
0
Ride
E90 Sedan LCI 335i FBO MHD E40
just had a similar issue with a friend's car. ended up being LPFP, similar error messages too.
since these cars don't have a low pressure sensor, in this case we hooked up an external fuel pressure gauge to his fuel line and confirmed low pressure. Think this would be the best approach in your case as well. that way you'll know where the pressure drops, if your fuel line pressure is ok then you'll know for sure it's HPFP, if not then either lpfp or ekp.
 

mwade60

New Member
May 12, 2023
1
0
0
Hello fellow BMW enthusiasts!

I am running into an issue with my F32 randomly going into a limp mode and shutting down the engine shortly after. In the majority of cases, I am able to start the engine and drive after clearing the error memory.

These are all the errors from different incidents:

11A002: High fuel pressure, plausibility: pressure too low
110001: Cylinder injection shutdown: catalyst protection due to too low pressure in the fuel system
481B03: Motor current too low
11A401: High fuel pressure when injection is released: Pressure too low
11B401: High fuel pressure during or after the injection is released (2nd environmental condition sentence after time delay): Pressure too low
21A023: Combustion engine: false start or engine stopped without driver influence

After googling for a while, it was my understanding that the HPFP is the culprit and I started looking for alternatives to replace the stock one with figuring out stage 1 dorch engineering one would be the best starting point (considering I have bm3 license and will be able to code it).

Everything else in the 435i is currently OEM, no other upgrades.

Reached out to dorch engineering and they were very positive HPFP is not the reason (quote “HPFP issues are non-binary and do not get resolved by simply clearing the memory”) and that it was likely EKP or LPFP suggesting I diagnose them somehow and replace either of them.

Can anyone vouch on the best practice in this case? How do I figure out what’s causing it and what I should be looking at replacing first?

Taking the vehicle to the dealership did not result in any solution as they were not able to reproduce the issue (as dumb as this explanation is considering I have all logs saved for them).

Any help would be appreciated.
Another noob here with exactly the same problem and codes. My stalling seems to be temperature related and my Indy shop recommended replacing both lpfp and epkm. I was expecting it to be one or the other. Any update on your situation?