[BMWJU]

Originally Posted by GSB

Wow, that's crazy. Brand new plugs defective? What brand?

I got NGK STEP 1 Colder plugs I believe.? And my car runs perfect now

Until tonight.. I got a 30ED code super knocking CYL 1 I heard it’s do to over boost or timing or fuel octane ratings as well

[aj2011n55]

Hey guys relatively new to cars and bimmers in general and had some questions about some codes. Lately my car has been shutting off randomly not super often but every once in a while. At times the power will feel normal but other times i have to push the throttle all the way down to get to 4k rpms. The service engine light and half check engine light come and go usually after i turn off the car for a bit. Thought it was a vaccum line issue so i replaced one and I dont hear air leaking anymore but still has some of the same problems.

Codes:
- DME active codes -
2774 - Air volume, plausibility: Air volume too high.
2BC1 - Mixture control: Fuel-air mixture too rich.
2C01 - High pressure fuel, plausibility Pressure too low.
375C - DME, protection against tampering: Program or data manipulation detected.
387F - Power management: Standby current violation.

- DME shadow (inactive) codes -
2BDE Fuel high pressure on enabling of injection: pressure too low

Mods installed:
Catless dp
stage 1 tune
bms intake
vrsf chargepipe

Car-2011 335i n55

Any help helps!

[GSB]

Originally Posted by aj2011n55

Hey guys relatively new to cars and bimmers in general and had some questions about some codes. Lately my car has been shutting off randomly not super often but every once in a while. At times the power will feel normal but other times i have to push the throttle all the way down to get to 4k rpms. The service engine light and half check engine light come and go usually after i turn off the car for a bit. Thought it was a vaccum line issue so i replaced one and I dont hear air leaking anymore but still has some of the same problems.

Codes:
- DME active codes -
2774 - Air volume, plausibility: Air volume too high.
2BC1 - Mixture control: Fuel-air mixture too rich.
2C01 - High pressure fuel, plausibility Pressure too low.
375C - DME, protection against tampering: Program or data manipulation detected.
387F - Power management: Standby current violation.

- DME shadow (inactive) codes -
2BDE Fuel high pressure on enabling of injection: pressure too low

Mods installed:
Catless dp
stage 1 tune
bms intake
vrsf chargepipe

Car-2011 335i n55

Any help helps!

Yikes. Any number of things can cause the power reduction and half-engine light, and the number of possibilities go up when you have a tune.

2C01 - High pressure fuel, plausibility Pressure too low.
2BDE Fuel high pressure on enabling of injection: pressure too low

These two codes may indicate a High Pressure Fuel Pump beginning to fail. The pump often fails intermittently. For example, you might have full power until you hit a certain RPM or engine load. Then it conks out and throws codes until the next engine restart.

The rich mixture might be related to the pump, or the result of injectors sticking open, or fuel rail sensor failure, or a weakening battery, or your DME tune, etc.

You could preemptively replace the pump, but that's an expensive roll of the dice. To be sure, you need a scan tool to watch the low-pressure fuel vs high-pressure fuel as you drive (live data). The high-pressure fuel supply should be approximately 10x higher than low-pressure fuel supply at all times.

[aj2011n55]

Originally Posted by GSB

Yikes. Any number of things can cause the power reduction and half-engine light, and the number of possibilities go up when you have a tune.

2C01 - High pressure fuel, plausibility Pressure too low.
2BDE Fuel high pressure on enabling of injection: pressure too low

These two codes may indicate a High Pressure Fuel Pump beginning to fail. The pump often fails intermittently. For example, you might have full power until you hit a certain RPM or engine load. Then it conks out and throws codes until the next engine restart.

The rich mixture might be related to the pump, or the result of injectors sticking open, or fuel rail sensor failure, or a weakening battery, or your DME tune, etc.

You could preemptively replace the pump, but that's an expensive roll of the dice. To be sure, you need a scan tool to watch the low-pressure fuel vs high-pressure fuel as you drive (live data). The high-pressure fuel supply should be approximately 10x higher than low-pressure fuel supply at all times.

Ahh okay thank you, think im just going to buy the pump rather save myself the headache, sparkplugs are next cuz was already planning on buy new fuel injectors anyways seeing as the car has like 140,000 miles. Appreciate the help!

[GSB]

Originally Posted by aj2011n55

Ahh okay thank you, think im just going to buy the pump rather save myself the headache, sparkplugs are next cuz was already planning on buy new fuel injectors anyways seeing as the car has like 140,000 miles. Appreciate the help!

Sounds good. No problem.

[GSB]

Originally Posted by Mia Katulla

Very helpful, thank you all for sharing and contributing.

Yes, this forum has saved me many times! Thanks for posting your appreciation, all the way from China!

[lambo911]

Hi All,

I am going to have a go at repairing my HPFP before buying another one. It looks like the issue was an oil leak past the seal on the drive wheel. So I'll top it up with oil and put in a new seal.

Has anyone found supplier in the UK for this seal please ?

It is a KACO seal made of rubber with what looks like a metal band on the outer and radius and a spring on the inner one. The size is 22mm outer diameter, 11mm inner diameter and the thickness is 7mm.
The car is a 2008 330i with 131k miles on the clock.

Cheers
Richard

[lambo911]

Can anyone help with sourcing a seal please ?

[GSB]

Originally Posted by lambo911

Can anyone help with sourcing a seal please ?

You may be in the wrong thread. This thread is about the HPFP for the 335i turbo-charged direct-injection engine. No seal kit is available for this pump.

[swellengear]

Originally Posted by lambo911

Can anyone help with sourcing a seal please ?

Can't help you with a UK source, but I have done this repair to 2 hpfps, and it certainly works. Here in South Africa, I found the seal from a hydraulics shop.

I did run into an issue, where the new seals were being pushed out by the internal pump pressure. Had a machine shop cut a groove for me, inserted a circlip, and problem solved!

[GSB]

Originally Posted by Michealj

Great overview of the HPFP issues! I’ve had similar experiences with my BMW, particularly the long crank times and intermittent 1/2 engine light. It seems like a common problem that many of us have faced. I also noticed that even though the replacement pumps are supposedly improved, I’ve heard mixed results about their effectiveness.

One thing I’d like to add is that while BMW has extended the warranty to 120k miles, it’s still frustrating dealing with repeated failures. For those of us who love our cars and aren’t ready to trade them in, staying on top of diagnostics and timely replacements is crucial. As you mentioned, getting a BT scanner might help catch issues early, but it’s still a gamble whether the dealership will replace the pump under warranty if no HPFP code is found.

It’s interesting to see that the new pumps, now made by Continental instead of Bosch, are generating some hope. Hopefully, they address the issues more effectively. In the meantime, for anyone dealing with HPFP problems, it’s worth pushing for prompt dealer action and keeping an eye out for any updates from BMW or class action lawsuits that might offer additional remedies.

Let’s keep each other updated on any new developments or fixes that come along. Thanks for sharing this comprehensive info!

Agreed. The trouble is that we'll never truly know whether people are installing the latest Continental pumps or older Bosch pumps or even Chinese refurbished pumps. There seem to be several mystery variations being sold by unscrupulous vendors. The prices on brand new pumps is pure extortion. It's no wonder that this is attracting posers who want to cash in!

Furthermore, I have little confidence in Continental because they manufacture that disgustingly unreliable N54 water pump with a plastic impeller housing that cracks. I complained after my 5th pump cracked and I was told that they have no intention of upgrading it because it only has a 1% failure rate. Lies! Outside of their pathetic warrantee, that thing has a 100% failure rate.

[GSB]

Originally Posted by swellengear

Can't help you with a UK source, but I have done this repair to 2 hpfps, and it certainly works. Here in South Africa, I found the seal from a hydraulics shop.

I did run into an issue, where the new seals were being pushed out by the internal pump pressure. Had a machine shop cut a groove for me, inserted a circlip, and problem solved!

Creative! How long has this fix lasted? Unfortunately, that seal isn't the only thing that fails in this HPFP.

[swellengear]

Originally Posted by GSB

Creative! How long has this fix lasted? Unfortunately, that seal isn't the only thing that fails in this HPFP.

Its been more than a year now, and still going. And yup, you are indeed correct. Plenty of bits that can go wrong. Bellows splitting, bellow o-rings going bad, solenoid failing and so on. All the seals can be replaced, but replacement bellows are to my knowledge, not available. Although these could be scavenged from another pump. Where there's a will, there's (usually) a way!

[GSB]

Originally Posted by swellengear

Its been more than a year now, and still going. And yup, you are indeed correct. Plenty of bits that can go wrong. Bellows splitting, bellow o-rings going bad, solenoid failing and so on. All the seals can be replaced, but replacement bellows are to my knowledge, not available. Although these could be scavenged from another pump. Where there's a will, there's (usually) a way!

A true African! You make us proud! I was born and raised in S.A. too.

[Xramses]

I had with 180k km also the HPFP failure. The large one which is placed underneath the alternator. I ordered 2 cheap ones from ebay. had no luck. then I discovered a self repair DIY video showing how to refill with hydraulic oil inside at the 3 pistons. I did, then for a certain time I was ok.
I decided to buy after the 100€ or 200€ ebay pump, the BMW authorised dealer leebmann24.com here in Germany for 950€. Since then that issue did not happen again. I have from my entrepreneurship here in Berlin best hydraulic shop for seals and oil for manufacturing machines or construction/transporters. But for a HPFP in a BMW (sexy heat machine!!) needs for me in Central Europe a working temperature range from -20 (cold start in extreme winter) to approx. 60 degrees Celsius of HPFP working temperature in Summer with warm motor. That's why and due to injectors protection, I decided for the "proper" HPFP.

[GSB]

Originally Posted by Xramses

I had with 180k km also the HPFP failure. The large one which is placed underneath the alternator. I ordered 2 cheap ones from ebay. had no luck. then I discovered a self repair DIY video showing how to refill with hydraulic oil inside at the 3 pistons. I did, then for a certain time I was ok.
I decided to buy after the 100€ or 200€ ebay pump, the BMW authorised dealer leebmann24.com here in Germany for 950€. Since then that issue did not happen again. I have from my entrepreneurship here in Berlin best hydraulic shop for seals and oil for manufacturing machines or construction/transporters. But for a HPFP in a BMW (sexy heat machine!!) needs for me in Central Europe a working temperature range from -20 (cold start in extreme winter) to approx. 60 degrees Celsius of HPFP working temperature in Summer with warm motor. That's why and due to injectors protection, I decided for the "proper" HPFP.

Very wise.

[Canuck335]

It looks like my HPFP is on its way out.
Long cranks, stalls when idling, throwing 2C01 and related codes, reduced power light intermittent, etc.

I understand it will drop into limp home mode when the HPFP can’t create the pressure and the LPFP provides fuel to the injectors.

Is this true for the N55 as well, and how long can it operate on just the LPFP?

[GSB]

Originally Posted by Canuck335

It looks like my HPFP is on its way out.
Long cranks, stalls when idling, throwing 2C01 and related codes, reduced power light intermittent, etc.

I understand it will drop into limp home mode when the HPFP can’t create the pressure and the LPFP provides fuel to the injectors.

Is this true for the N55 as well, and how long can it operate on just the LPFP?

Same pump, same problems.
Mine ran for a few months with this failure because it was still developing enough low pressure. If the car ever went into limp mode, I'd just shut off the engine and restart, driving more carefully to prevent high pressure demand. But every case could be different.

[Canuck335]

Originally Posted by GSB

Same pump, same problems.
Mine ran for a few months with this failure because it was still developing enough low pressure. If the car ever went into limp mode, I'd just shut off the engine and restart, driving more carefully to prevent high pressure demand. But every case could be different.

Did you go on long drives, say 100 miles or so in limp mode?
I have an appointment to replace the pump in a couple weeks and I’m wondering if I should just stop driving the car until then.

[gn240z]

i have no fuel to the rail/injectors. replaced hpfp, thinking this was the problem.car runs on starting fluid, low pressure reading is 87 psi. there is 1 wire to the hpfp, does this open? from the dme? is there a fuse or relay that controls this hpfp? not sure why i dont have fuel after the hpfp. any insight appreciated.

[Canuck335]

Originally Posted by gn240z

i have no fuel to the rail/injectors. replaced hpfp, thinking this was the problem.car runs on starting fluid, low pressure reading is 87 psi. there is 1 wire to the hpfp, does this open? from the dme? is there a fuse or relay that controls this hpfp? not sure why i dont have fuel after the hpfp. any insight appreciated.

Did you pull the codes?
Also your profile says you have a 335 diesel. Is that true?

[gn240z]

problem solved, the low pressure was 87, hi was 26. who would ever think the outlet of the lpfp was cracked off,.. when i primed it made noise, made pressure according to bimmergeeks. but i guess the lpfp is measured before the outlet.. what i found was the injector line was dry, then i went to the line at the hpfp, it was dry too.. so it had to be before this... inspected the lpfp, and heard it running, but it wasn't going anywhere, i saw bubbles, and then , there it was, a cracked top... swapped it out, car instantly started. problem solved... and yes,i have diesels too.. but this is a gas car.. my first one.