[Dmoney]

Just got my Car back today, Had to have injector #5 mosfet replaced, and coil on injector #5. Back on the road for a fraction of what it would have cost to replace the DME.

[thatg]

Originally Posted by Dmoney

Just got my Car back today, Had to have injector #5 mosfet replaced, and coil on injector #5. Back on the road for a fraction of what it would have cost to replace the DME.

Hey guys i just got all the same codes as OP. Was doing a valve cover gasket replacement and starter the engine without one of the coil grounds attached. This might have fried the ECU. Is there a way for me to confirm that I’ve done damage to the ecu by looking at it?

My p30bb code is accompanied by a “error injector, power level 2”

Edit: just saw the very helpful video posted on the previous page, thank you for making that! Are the msd80/msd81 plug and play? Is there an advantage to the 81? I see them going for $100-150 on ebay. Do these require programming?

[vncung]

Do I need to use soldering paste before applying the new mosfet?

[bl0wnb0xerbabie]

After I flashed MHD stage 1, I got the internal fault codes mentioned here. Under warranty, the dealer replaced the dme to msd81.

After hard driving, the same cylinder 2 misfire came on again. Could it be the coil that is still messing up here or if it was just the MOSFET, shouldn't it have been fixed since the dme was fully replaced?

[vncung]

Its the coil. Many others including me needed to replace both the mosfet and the coil on same cylinder to fix the misfire. If you want to be sure, Swap cylinder 2 coil to another cylinder to confirm.

Originally Posted by vncung

Many others including me needed to replace both the mosfet and the coil

...and the injector in some cases. Start small before working your way up though, of course.

[bluemonstr]

Originally Posted by FCobra94

...and the injector in some cases. Start small before working your way up though, of course.

Yep - I just went through a complete DME overhaul this weekend. Replaced ALL mosfets and needed to replace the Coil and Injector - IN ANOTHER cylinder. I don't know why but my #1 mosfet was out and what the car 'told' me was out...but I needed to replace the injector and coil from cylinder #3. So there is that. Do what ya need to do to fix the misfire.

I think by now - most of us have spares of all these things. Its funny how that works out.

[bluemonstr]

Hey all - I just went through this issue and appear to be in the thick of it again. I'm just looking for any ideas/possible assist.

I had the 30BA code come up last week (about a week ago). I ordered the mosfets and received them last friday. My buddy and I replaced (all 6) - the code was ONLY for cylinder 1 and when we TESTED using the beep method (from youtube)...only cylinder 1 tested bad. BUT I ordered 8 new mosfets (figuring I'd replace all of them). Long story short - changing out injectors and plugs and coils - I am AGAIN getting the same 30BA code...however before the code popped up - I just received a 29CD - misfire to cyl 1. I cleared it hoping maybe it was just a plug, but now 30BA popped up and won't clear (just like last week). It is only telling me injectors 1,2 or 3 - not specific to any one at this point. I'm going to pull the DME - again and test the mosfets again - but is it possible that after driving for about 50 miles the solder or some type of connection failed? Is it possible that a previous O2 sensor code is causing an issue (a 2C3B code that popped up) last week when the 30BA came up, I figured it was because of the DME though...now I'm wondering if the 2C3B code is the root cause??? I'm going batty trying to figure out this...the car was running great yesterday and this morning until it just pooped on me.

Any ideas/thoughts appreciated.

[feuer]

Originally Posted by bluemonstr

Any ideas/thoughts appreciated.

How about you replace the Mosfet for inj#1 and you replace the injector itself. Is possible that the injector is internally damaged causing the Mosfet to short out. Since you are DIYer you can do this on the cheap. Just source one good used injector.
Maybe you will find this useful http://www.bmwtis.com/tsb/bulletins/...hic_temp/B1202
I replaced one Mosfet (the injector too) and it dint't fix the issue with the DME

[bluemonstr]

Originally Posted by feuer

How about you replace the Mosfet for inj#1 and you replace the injector itself. Is possible that the injector is internally damaged causing the Mosfet to short out. Since you are DIYer you can do this on the cheap. Just source one good used injector.
Maybe you will find this useful http://www.bmwtis.com/tsb/bulletins/...hic_temp/B1202
I replaced one Mosfet (the injector too) and it dint't fix the issue with the DME

I was wondering that exact thing (if the injector can cause the mosfet to blow). By you saying this, it relieves a little worry on my part. I've just removed the DME again and am going to be testing the mosfets again tonight. I have a 'spare' injector if I have to use something in a pinch. And yes, I tinker a bit. I have the INPA tools for the injectors. I was just worried thinking about having to try and figure out how to clone a DME or code another to my car...that seems a little involved. I have very basic coding abilities (changed my angel eyes, windows and battery).

EDIT we removed the mosfet from the DME - we tested the mosfet and it was good. We tested the DME location and it 'beeped' at us. It turns out the solder flux was causing a 'short' or connection where there shouldn't be one. Making it appear as if the mosfet was blown (again). When in fact it was not. Sooooo, it would appear that you have to be careful with how much flux you use and what type. My buddy that helped me on this and used a bit too much and it would appear that the flux looked like the board itself was burned - turned out the flux (burned) and was easily removed by my finger. Once I did that the board is again testing a-okay. The mosfet is good and we are soldering it back on tonight. I will re-install tomorrow and hopefully all will be good again.

I just wanted to give as much info as possible for anyone else.

[BN244]

Wow thats great!

[BN244]

What map are you running ?

[shaginwagon13]

Hey guys,

So I got this problem last night. Got a BUNCH of the codes described in this thread and car went into limp mode. Tried to clear the codes with COBB...they cleared and came right back.

Anyone has a part number or link to where to get mosfet? COBB indicated the following codes:

30bb - DME digital motor electronics, internal failure
0305
0306
0304
0300
29d1 - Misfire Cyl 5
29d2 - Misfire Cyl 6
29d0 - Misfire Cyl 4
29d9 - something about misfiring with low fuel level
29cc - Misfire Multiple Cylinders

[shaginwagon13]

Originally Posted by feuer

I just did one this morning (not my car). Ordered 6 from DigiKEy . #5 mosfet wasn't completely shorted out so I check the board with the mofset removed just to make sure isn't anything else going on.

Mind posting the link to the exact mosfet you ordered? I need to order 6 and wanted to get the order right. Found this one, which I think will work, or is there a newer/better one?

https://www.digikey.com/product-deta...MCT-ND/1566830

Thanks in advance.

[feuer]

Originally Posted by shaginwagon13

Mind posting the link to the exact mosfet you ordered? I need to order 6 and wanted to get the order right. Found this one, which I think will work, or is there a newer/better one?

https://www.digikey.com/product-deta...MCT-ND/1566830

Thanks in advance.

I don't have the link. FDB14N30TMCT-ND is what I ordered.

[shadock59]

3 years and 6 months ago I installed FDB14N30TM (all the mosfet changed to be sure) and still going strong (jb4 and I also use map 5 with e85)
I recommand this reference.

[sigi77]

Did anyone change the 2 mosfets on the left side, along with the 6 in one block?

[bluemonstr]

Originally Posted by sigi77

Did anyone change the 2 mosfets on the left side, along with the 6 in one block?

I did not - even though I had 2 extras - I never once have heard of any problems with those two - have no idea what they are for...therefore I did not touch them. I just replaced ALL 6 at once I did NOT want to have to go through all this again - especially with the risk of losing an injector. I felt it was easy money to replace the 6.

[sigi77]

Thanks mate for the quick answer, changing the 6 today. Fingers crossed.

[zohaibrose]

What if you have a MSV80 for n52 what mosfet would you need then? Getting exact same codes as op except the 30bb code.

[WhoWhatNow]

Can anyone link to the correct MOSFET for an MSD80. The markings on the bad MOSFET are IRFW644B. There appear to be many chips with different specs. I want to get the correct one. Thanks!

[bluemonstr]

Originally Posted by WhoWhatNow

Can anyone link to the correct MOSFET for an MSD80. The markings on the bad MOSFET are IRFW644B. There appear to be many chips with different specs. I want to get the correct one. Thanks!

I purchased these direct:

https://www.mouser.com/ProductDetail...512-FDB14N30TM

From my research - they are an 'upgrade': FDB14N30TM

I had them in a couple days.

Also - you do realize - the part numbers are literally a couple posts above yours?