[bl0wnb0xerbabie]

My car is otherwise stock besides MHD install and my car was running perfectly fine for weeks after the install however, one night I was driving the car somewhat aggressively and threw a cylinder 2 misfire.

I flashed back to stock, took it to BMW, and tech told me this: "Found fault codes #002FA3 (NO CODING IN DME), #002F4A (EWS-DMW INTERFACE FAULT), #002ACC (DME MASTER RELAY FAULT), #0030BA (BANK1 INJECTORS FAULT=DME INTERNAL FAULT) & #0030BB (BANK2 INJECTORS FAULT=DME INTERNAL FAULT). It was internally defective. The DME was replaced which is your engine module."

Even though I told the rep that I flashed, it doesn't seem like the tech know so luckily, they covered it under warranty. I want to go stage 2 but worried that the dme will fault again thereby putting my warranty in jeopardy.

[skyotee]

I am not sure what happened with your previous DME, but I am guessing it might not have had anything to do with MHD. You did flash back to stock (original), not stage 0, right? If so, you should have had all original DME programming, so nothing the dealer should have even detected.

I have been running MHD under warranty, and been in for service many times. Each time I go in, I flash back to stock (stock, not stage 0). And each time, they don't notice any DME issues.

Although, this can also cause a problem, in that flashing back to stock clears the codes. And the dealer wants to see a code before they will troubleshoot ANY issue. But I have always been worried that if they see MHD tune or loader software, they will blame the issue on that and deny warranty. So I always flash back to stock first, eliminating MHD tune & loader. Even if that means I have to drive for awhile at stock, and get the code to come back, before I go to the dealer for service...

[Silent9n54]

i had the same issue with my DME not too long ago and ive been using mhd for 6 months...stage 1 , 2, e maps... i noticed that a lot of 2007s had the same issue with dme80 but honestly i don't think it has anything to do with the mhd tune...

[bl0wnb0xerbabie]

Originally Posted by skyotee

I am not sure what happened with your previous DME, but I am guessing it might not have had anything to do with MHD. You did flash back to stock (original), not stage 0, right? If so, you should have had all original DME programming, so nothing the dealer should have even detected.

I have been running MHD under warranty, and been in for service many times. Each time I go in, I flash back to stock (stock, not stage 0). And each time, they don't notice any DME issues.

Although, this can also cause a problem, in that flashing back to stock clears the codes. And the dealer wants to see a code before they will troubleshoot ANY issue. But I have always been worried that if they see MHD tune or loader software, they will blame the issue on that and deny warranty. So I always flash back to stock first, eliminating MHD tune & loader. Even if that means I have to drive for awhile at stock, and get the code to come back, before I go to the dealer for service...

Yes, I really hope it isn't the MHD itself. Yes I did flash back to stock, not stage 0, I told the rep that I flashed. As for your strategy, I was told by others, that even if you flash back, they can still look back into the ECU and read previous parameters such as high boost level so they can still detect those higher values.

Has this specific situation with the DME happened to you? What problems did you bring it in for, or are you just saying in general when you bring it in for service, you flash back to stock?

[bl0wnb0xerbabie]

Originally Posted by shanker604

i had the same issue with my DME not too long ago and ive been using mhd for 6 months...stage 1 , 2, e maps... i noticed that a lot of 2007s had the same issue with dme80 but honestly i don't think it has anything to do with the mhd tune...

Wait so if you had then same issue, how did you fix it? What happened after? Why do you think it's not the MHD tune itself? I believe that as well. My car is a 2010 and I was running fine with MHD flash stage 1 for weeks without any problems.

[RSL]

I've never seen MHD corrupt a DME. Worst case scenario, do a long write and rewrite every byte. MSD80 specifically has some issues others don't, most notably injector MOSFETs that go bad, but are cheap to replace. Sounds like exactly what yours did looking at the codes.

[Silent9n54]

Originally Posted by bl0wnb0xerbabie

Wait so if you had then same issue, how did you fix it? What happened after? Why do you think it's not the MHD tune itself? I believe that as well. My car is a 2010 and I was running fine with MHD flash stage 1 for weeks without any problems.

took the dme to a local guy who replaced few mosfets on the dme

i had the 30BA code along with codes for o2 and catalitic missing

got the dme back in a day and worked fine since... still running e40 maps..

[MoserBMW]

I had flashed mhd stage 2+ on my 07 335i, and then 10 seconds down the road I got the same 30bb code. Pulled the DME, checked all my mosfets and they all checked out. Ended up being a power supply issue of some sorts on the old DME. Ended up upgrading to MSD81.

[TemjinX2]

are you using a battery charger when your flashing?. the dme acts weird on low battery.. i have the flash freeze before but i just reflashed it and car worked fine... i have a 2008

[Boland01]

MDS80 does have issues. On our 2007 the replacement mosfets lasted a year then the whole DME crashed. $3K later the stealership put in a new replacement MDS81. That was the only silver lining.

As others have said you need to make sure you keep your voltage up (battery charger) when flashing the MHD. There's a chance that was the issue.

[mj6234]

$3K!!!!! Buy an eBay MSD81 and pay someone to code it. EBay DME I got for $100 and just had shipping and coding fees. No issues since then.

https://www.facebook.com/Bimecu/

[skyotee]

Originally Posted by bl0wnb0xerbabie

Has this specific situation with the DME happened to you? What problems did you bring it in for, or are you just saying in general when you bring it in for service, you flash back to stock?

Sorry, no I have not had a similar situation to yours. I was just saying that generally, I have had a few reasons to go in for service while I was running the MHD tune. And that I flash back to stock, and maybe drive stock for awhile until the codes come back, and then go in for service. And they never mention anything about the DME after they scan it and troubleshoot whatever my problems were. That just makes me think your DME problems are unrelated to the tune, and if it were me I would not be worried about loading the tune on the new DME.

[bl0wnb0xerbabie]

Originally Posted by RSL

I've never seen MHD corrupt a DME. Worst case scenario, do a long write and rewrite every byte. MSD80 specifically has some issues others don't, most notably injector MOSFETs that go bad, but are cheap to replace. Sounds like exactly what yours did looking at the codes.

Newb question but are MOSFETS just electrical parts that can go bad in the DME? And if it's just the MOSFETS, why would dealership replace the whole DME?

[bl0wnb0xerbabie]

Originally Posted by MoserBMW

I had flashed mhd stage 2+ on my 07 335i, and then 10 seconds down the road I got the same 30bb code. Pulled the DME, checked all my mosfets and they all checked out. Ended up being a power supply issue of some sorts on the old DME. Ended up upgrading to MSD81.

Is MSD81 the DME model? How do I know if the dealership replaced it with MSD81 or not?

[bl0wnb0xerbabie]

Originally Posted by TemjinX2

are you using a battery charger when your flashing?. the dme acts weird on low battery.. i have the flash freeze before but i just reflashed it and car worked fine... i have a 2008

Well after the initial CEL, I flashed back to stock before I took to dealership and I drained my battery because I didn't use the charger.

[RSL]

Originally Posted by bl0wnb0xerbabie

Newb question but are MOSFETS just electrical parts that can go bad in the DME? And if it's just the MOSFETS, why would dealership replace the whole DME?

Yes, they control the voltage and current to whatever component they are powering. They are soldered on a PCB, dealership isn't performing that kind of work and I wouldn't trust them if they did. MOSFETs are relatively cheap and any competent solderer with the right tools could knock out the replacement quickly. Most people seem to hit TV and electronics repair places for the work, but some members/tuners/vendors do it too.

Originally Posted by bl0wnb0xerbabie

Is MSD81 the DME model? How do I know if the dealership replaced it with MSD81 or not?

Pretty sure MSD80 is I8A0S roms only. If you have IJE0S or anything later, should be MSD81. I believe a few other modules need to be replaced going from MSD80 to MSD81 too (CAS, etc.), but you could always pull the DME and look. It will be labelled on the outside of the case.

[RocketSurgeon]

The MSD80 and MSD81 are interchangeable, no other parts need to be swapped. Your CAS does need to be synced to the new DME though.

[bl0wnb0xerbabie]

Ok, so the consensus is that despite the fact that the fault codes came up post MHD flash, the problem might have just been the dme's electronic connections or the battery being drained when I flashed back to stock before I took it in correct?

[Momir@MHD]

Blown MOSFETS are a known issue on the MSD80 DME, they fail on stock cars too - one reason why BMW replaced the MSD80 with the MSD81.

(Codes: 30BB, 30BA)

Repair the DME (new MOSFETS) or upgrade to the newer MSD81 (recommended).

Blown MOSFETS could be caused by a bad coil pack or a bad injector, check them after repairing the DME...

[RSL]

Originally Posted by bl0wnb0xerbabie

Ok, so the consensus is that despite the fact that the fault codes came up post MHD flash, the problem might have just been the dme's electronic connections or the battery being drained when I flashed back to stock before I took it in correct?

That would be my assumption. MOSFETs were already on their way out, adding load/boost raised the demand on the injectors (and work for MOSFETs) and the weakness showed itself. Kinda like old coils on a first tuned car. Might be OK puttering around stock, but turn up the wick a little bit and good chance they'll cause misfires until refreshed.

The MHD flash process itself seems very safe. Even if the battery completely died in the middle of a flash, the next the time the flash process is started, MHD will either give you an option to do a full write or make you do a full write depending at what point it was interrupted. Either way, can't imagine any scenario it was the flash operation itself and you've got a new DME, so MOSFETs should be good another 7-10 years.

[bl0wnb0xerbabie]

So the dealer replaced the dme to msd81 under warranty and had no issues while driving on the stock base map. Once I reflashed back to stage 1, I was still throwing cylinder 2 misfire code.

Could it be the coil or something mechanical still even though the dme was fully replaced?

[335e92tx]

Originally Posted by bl0wnb0xerbabie

Could it be the coil or something mechanical still even though the dme was fully replaced?

yep
Try moving coil and plug to different cyl.