Hpfp low pressure error code at idle

Supr3me · 08-12-2021, 04:59 PM

Also posted in the X3M /X4M FB group.

To recap:
Been struggling with some weird fueling codes at idle. No issues under load but at idle the rail pressure oscillates and then drops below the ECU parameters and throws a drivetrain error. Clear DTCs resolves the issue, even without restarting the car.
Catless DP, E50 custom tune, ~7K miles.

Flashed back to stock and filled with 93, issue remains as seen here.
Obviously could be hpfp, but again, there are no issues under load.
Seems like it could be a sensor. Could an exhaust leak or other airflow issue cause an issue at idle but not under load?

2kaccordocoupe · 08-14-2021, 07:58 AM

HPFP problems reminds me of my N54. Flashback.

Supr3me · 08-22-2021, 11:25 AM

Bump. Anyone else with hpfp low pressure codes?

heavyD^2 · 08-22-2021, 11:59 AM

These cars have two fuel pumps in parallel and it's possible one is not working properly.

Supr3me · 08-22-2021, 12:02 PM

Quote:

Originally Posted by heavyD^2

These cars have two fuel pumps in parallel and it's possible one is not working properly.

Agreed. Just curious if anyone else has run into any hardware issues with the pumps. My understanding is it's two B58TU pumps and those are reasonably high flow pumps. I'm shocked that I have 7K miles on the vehicle and would be running into issues with them on a moderate E50 tune.

The issue isn't tune related because when I flash back to stock and put 93 in it the issue is actually worse.

FSociety · 09-03-2021, 09:33 PM

How do you know if your moderate tune wasn't the cause of it?

I've never seen that code but everyone I know is on BM3 platform and custom tune for over 10k miles.

Not saying it was 100% your tune, but over 50 ppl i know in whatsapp X3M/X4M chat with the same platform means it's either isolated issue to your modifications.

We run from E30 to Full E85 daily btw.

Supr3me · 09-16-2021, 09:15 AM

Quote:

Originally Posted by FSociety

How do you know if your moderate tune wasn't the cause of it?

I've never seen that code but everyone I know is on BM3 platform and custom tune for over 10k miles.

Not saying it was 100% your tune, but over 50 ppl i know in whatsapp X3M/X4M chat with the same platform means it's either isolated issue to your modifications.

We run from E30 to Full E85 daily btw.

I can't be certain that the tune didn't cause it, it's definitely possible. But whatever the cause, the issue remains after flashing back to stock and putting premium in. So some system or component is involved, beyond the tune.

Supr3me · 09-16-2021, 09:16 AM

Update: BMW dealership testing condemned both HPFPs. Still working through the warranty claim, adviser thinks that they will cover it. We'll see what happens.

Supr3me · 10-24-2021, 05:25 PM

Update:
BMW denied the warranty claim due to tune. Quoted me $3400 to replace both pumps. I laughed out loud in person. They came back later and offered to provide one of the pumps at no cost.
I sourced both the pumps myself for $1100 shipped and had them in in less than 25 minutes, mostly to pull the trim, air box and strut bar.
Resolved the issue.
I'm pretty sure both pumps weren't bad but for the price just did both. Nuke it and forget it.

08-12-2021, 04:59 PM	#1
Supr3me Captain 551 Rep 684 Posts Drives: Your mom crazy Join Date: Feb 2015 Location: Sioux Falls SD iTrader: (0) Garage List 2020 BMW X3M CURRENT [0.00] 2016 BMW 340i BEAST [0.00] 2011 BMW 335i RIP [0.00] 2003 BMW 330i SOLD [0.00]	Hpfp low pressure error code at idle Also posted in the X3M /X4M FB group. To recap: Been struggling with some weird fueling codes at idle. No issues under load but at idle the rail pressure oscillates and then drops below the ECU parameters and throws a drivetrain error. Clear DTCs resolves the issue, even without restarting the car. Catless DP, E50 custom tune, ~7K miles. Flashed back to stock and filled with 93, issue remains as seen here. Obviously could be hpfp, but again, there are no issues under load. Seems like it could be a sensor. Could an exhaust leak or other airflow issue cause an issue at idle but not under load? Attached Images __________________ 2020 X3M MG Flasher; Wedge Performance E50 tune MSS Urban; Rohana RFX11
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08-14-2021, 07:58 AM	#2
2kaccordocoupe Brigadier General 1272 Rep 4,703 Posts Drives: Former ///M Driver Join Date: Nov 2008 Location: The 6ix iTrader: (2)	HPFP problems reminds me of my N54. Flashback.
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08-22-2021, 11:25 AM	#3
Supr3me Captain 551 Rep 684 Posts Drives: Your mom crazy Join Date: Feb 2015 Location: Sioux Falls SD iTrader: (0) Garage List 2020 BMW X3M CURRENT [0.00] 2016 BMW 340i BEAST [0.00] 2011 BMW 335i RIP [0.00] 2003 BMW 330i SOLD [0.00]	Bump. Anyone else with hpfp low pressure codes?
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08-22-2021, 11:59 AM	#4
heavyD^2 Colonel 3689 Rep 2,956 Posts Drives: X3M Competition Join Date: Apr 2018 Location: Too close to Santa iTrader: (0)	These cars have two fuel pumps in parallel and it's possible one is not working properly.
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09-03-2021, 09:33 PM	#6
FSociety IG @bmwF9xG80 3813 Rep 7,593 Posts Drives: G80 M3, X4M, G07 X7m50 Join Date: Apr 2012 Location: NYC to NJ to Orlando FL iTrader: (3) Garage List 2023 BMW G80 M3 [0.00] 2020 BMW X4MC [0.00] 16' BMW X4 M40i [10.00] 06 Cadillac STS [0.00]	How do you know if your moderate tune wasn't the cause of it? I've never seen that code but everyone I know is on BM3 platform and custom tune for over 10k miles. Not saying it was 100% your tune, but over 50 ppl i know in whatsapp X3M/X4M chat with the same platform means it's either isolated issue to your modifications. We run from E30 to Full E85 daily btw. __________________ 60-130mph 6.5s X4M #HCP 60-130mph 5.0s G80 M3 #OrlandoAutowerks Sauce IG: @bmwF9XG80
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09-16-2021, 09:16 AM	#8
Supr3me Captain 551 Rep 684 Posts Drives: Your mom crazy Join Date: Feb 2015 Location: Sioux Falls SD iTrader: (0) Garage List 2020 BMW X3M CURRENT [0.00] 2016 BMW 340i BEAST [0.00] 2011 BMW 335i RIP [0.00] 2003 BMW 330i SOLD [0.00]	Update: BMW dealership testing condemned both HPFPs. Still working through the warranty claim, adviser thinks that they will cover it. We'll see what happens.
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10-24-2021, 05:25 PM	#9
Supr3me Captain 551 Rep 684 Posts Drives: Your mom crazy Join Date: Feb 2015 Location: Sioux Falls SD iTrader: (0) Garage List 2020 BMW X3M CURRENT [0.00] 2016 BMW 340i BEAST [0.00] 2011 BMW 335i RIP [0.00] 2003 BMW 330i SOLD [0.00]	Update: BMW denied the warranty claim due to tune. Quoted me $3400 to replace both pumps. I laughed out loud in person. They came back later and offered to provide one of the pumps at no cost. I sourced both the pumps myself for $1100 shipped and had them in in less than 25 minutes, mostly to pull the trim, air box and strut bar. Resolved the issue. I'm pretty sure both pumps weren't bad but for the price just did both. Nuke it and forget it.
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