[scug]

2008 335i FBO
87,XXX miles

Last week when I started my car in the morning it was severely misfiring and the SES light started flashing. Spark plugs and coils are all fresh. This was completely random, the car was driving normally the day before with no issues.

Im assuming my HPFP has finally failed. If this is the case, Im considering doing it DIY. However, it is undriveable so I cant take it to the shop to confirm.

These are the codes i'm getting:
-29CC Combustion misfires, several cylinders
-29CD Combustion misfires, cylinder 1
-29CE Combustion misfires, cylinder 2
-29CF Combustion misfires, cylinder 3
-29D9 Misfire at low tank fill level
-30BA Injectors 1,2,3 or DME, internal fault

-2FDB Fuel high pressure nach Freigabe der Einspritzung (shadow)

I was hoping someone could confirm my suspicion and I can get on with ordering the part. If not, I'm going to have the car towed to the shop and have my guy look at it.

Thanks!

[dpaul]

The key here is likely the 30BA error. That's a DME internal error, often associated with MOSFET failure at least in early (MSD80) DMEs (which you likely have) but could reflect a bad ground.

No reason to assume HPFP has anything to do with your issues. That shadow code could have quite a few explanations and failing HPFP usually (or at least often) give you some warning (i.e. long cranks to get started).

[MysticRob]

Originally Posted by dpaul

The key here is likely the 30BA error. That's a DME internal error, often associated with MOSFET failure at least in early (MSD80) DMEs (which you likely have) but could reflect a bad ground.

No reason to assume HPFP has anything to do with your issues. That shadow code could have quite a few explanations and failing HPFP usually (or at least often) give you some warning (i.e. long cranks to get started).

Agreed, the HPFP shadow code is ever-constant and really not indicative of anything wrong there.
OP, you say you're FBO, which I assume means no cats, right? I ask because the problem being across all 3 cylinders on Bank 1 makes me think you have a clogged cat or O2 sensor issue. Figured I'd ask just in case.

[scug]

Originally Posted by MysticRob

Agreed, the HPFP shadow code is ever-constant and really not indicative of anything wrong there.
OP, you say you're FBO, which I assume means no cats, right? I ask because the problem being across all 3 cylinders on Bank 1 makes me think you have a clogged cat or O2 sensor issue. Figured I'd ask just in case.

The car has VRSF Catless downpipes. You could be right on the o2 sensor. I flashed the car back to stock and started it up. Only got one code this time for injectors 1, 2, and 3. I am suspicious that it may be time to replace them. Appreciate the replies.

[scug]

Originally Posted by dpaul

The key here is likely the 30BA error. That's a DME internal error, often associated with MOSFET failure at least in early (MSD80) DMEs (which you likely have) but could reflect a bad ground.

No reason to assume HPFP has anything to do with your issues. That shadow code could have quite a few explanations and failing HPFP usually (or at least often) give you some warning (i.e. long cranks to get started).

You may be correct on the MOSFET failure. Will do some more research on that.

[catcher22]

30BA. MOSFETs fried. Replace em.

[dpaul]

Originally Posted by catcher22

30BA. MOSFETs fried. Replace em.

I admire the confidence in your diagnosis.

[catcher22]

Originally Posted by dpaul

I admire the confidence in your diagnosis.

Thank you

I had those exact same codes, to the T, back in March 2018.

I sense sarcasm, and yeah, it could be anything, but folks will learn that on this platform the vast majority of owners have the same exact major problems, over and over again. Odd things happen now and then where it is difficult to diagnose, but if it looks exactly like a common problem almost every N54 encounters, that's usually a good place to begin troubleshooting.

[dpaul]

Agreed. However, having experienced a number of issues where the standard patterns did not apply, I am cautious.

[scug]

Originally Posted by catcher22

30BA. MOSFETs fried. Replace em.

Big thanks to everyone who replied. Pulled the DME, tested continuity of mosfets, and you were correct. Injector #1 mosfet was fried. Took it to the local TV repair shop and got it taken care of. Car is back to normal

[Bimmer_Engineer]

Originally Posted by scug

Big thanks to everyone who replied. Pulled the DME, tested continuity of mosfets, and you were correct. Injector #1 mosfet was fried. Took it to the local TV repair shop and got it taken care of. Car is back to normal

I never woulda guessed there were still TV repair shops around...

[mardaozo]

any updates, ? im having the same issues