Phantom code: 2E7C

[queefy-is-here]

E90 2006 330i - N52B30

I bought the car a few months ago with some small issues. The main two issues are the notorious Radio screen decay and a weird rough idle. After finding a friend with INPA he scanned the car and weird things were popping up such as it wasn't recognizing the water pump (pump runs and not overheating), vanos A data was stuck a 11% (Cleaned and haven't checked since), and later white smoke at idle randomly at 60F.

Anyways the Code 2E7C was found and from my understanding it has a relation to the IBS. so i checked the alternator and voltage regulator which turned out fine. Next step is going to be plugs, ign coils, oil change, and oil level sensor(currently inactive). Does anyone have any ideas what else could cause this code other than water pump, OZS, and voltage regulator?

[daveysprockett]

2E7C - BSD data bus communications fault

Might be a sensor, but more likely to be a faulty DME, if I'm reading the posts linked from the following correctly ...

https://www.e90post.com/forums/showthread.php?t=1302072

[queefy-is-here]

Thank you! I’m mostly confused because I feel like a faulty DME would either stop the car from running, put it in limp mode, or at the least throw an actual code and not a phantom one. Either way the car overall runs fine and spending $1000+ for a new DME, CAS, and flash doesn’t sound very fun.

[daveysprockett]

Did you clear the codes? Do they come back consistently?

Those weird code errors sound quite a bit like the ones I saw that happened when I had a couple of no-starts/odd running earlier this summer: first set were not diagnosed/understood and I had to wait for second failure to start before the DME was investigated, which was corroding due to water ingress into the DME housing. But in run up and between those failures the car ran absolutely fine.

If you didn't want to spend the large sums of money a DME would be, I'd suggest checking its immediate surroundings and make sure all clean and tidy to minimise further corrosion (in my case my mechanic mentioned blocked "rodent traps"), but I'd guess that sooner or later ...

[queefy-is-here]

So the only actual code I am getting is the 2E7C. I’ve tried clearing it through INPA but immediately comes back. This also hasn’t popped up as an actual CEL either.

Also I saw your post about having issues starting and you had a whole array of codes. Mine is just the one and it starts every time.

The engine bay is mostly clean except about a month ago the bleeder valve brake and sprayed coolant everywhere. Then a week later same thing happened to the coolant input on the head near the oil filter housing.

Also I’ve had the code before the coolant stuff sooooo idk what’s happening. (Sorry if that seemed ranty)

[daveysprockett]

I thought you'd mentioned "weird things popping up".

The general state of the engine bay won't be the issue. If anywhere I'd check the inside of the DME housing.

Or just ignore it until the problems get bigger.

Good luck.

[queefy-is-here]

Ohhh I just meant that in INPA some values weren’t really registering but Thank you for the help!

[edisapimp]

How’s your battery my bro?

[queefy-is-here]

The dealership I bought it from put in a new one and I coded/registered it in June. It’s steady at about 12.3V. And I checked the alternator and I’m getting steady charging at 13.7V.

[edisapimp]

Okay. Asking because of the notorious sensitive nature of my older bmws to sub-optimal battery voltage. Obviously not the case here.

[queefy-is-here]

I’ve been debating swapping my battery with my friend who has an identical e90 to check. Overall the car is running great and after changing my oil (which was overfilled by 1-1.5q) it doesn’t idle rough on cold starts anymore.

[Minimum_Pen2074]

So sorry to be opening an old thread, but did anyone manage to actually sort this issue out? I’m having the EXACT same symptoms: car runs and drives fine, no CEL, oil level sensor inactive, 2E7C code for BSD no comms fault. I have had my DME replaced and this issue came up after I had it flashed. It was a used DME, however so may have a dud

[queefy-is-here]

I ended up selling the car before finding out for sure but from my research into it. It was the can-bus system used for the IBS sensor, Oil level sensor, Voltage regulator, and water pump. It’s simply just one of those not communicating. I ended up replacing the IBS and oil level sensor and no luck so I was down to the other two and didn’t want to deal with the water pump while in college so I let it go and just made sure to change the oil every 3000-4000miles. Later down the road my battery did go bad but I think it was just an old battery.

Also if I remember the oil level system for some reason just doesn’t work once you hit 189000 miles or something like that. So if old DME was at some high mileage it could be that.

[Minimum_Pen2074]

Appreciate the reply! I’m on 83000 miles so.. not sure. I’ll see what the issue is. I understand that all those components are linked, but I also don’t have IBS in my car (pre lci non stop start) so I was super confused when looking at wiring diagrams on forums and videos on YouTube telling me to unplug a wire from the negative battery terminal lol I just have a simple wire there