4 codes not sure the issue

[Wagner88]

I was driving to work and did a pull on the highway and the car gave me the half full engine light and from what I've found that means it went into limp mode. Luckily my good buddy lived near and came with his scanner and these four codes came up

2dec
30ba
30bb
30fc

I've looked through out the different threads but I haven't found anyone who had any mixture of these codes so I'm curious if anyone has any insight into what could be causing these. I ended up replacing the main ground wire as someone mentioned that could be the issue and I also tightened the brackets holding the intercooling tubes on to fix the air leak but I took it out after replacing the ground and it’s still throwing the codes, it only seems to be when I hit max boost because I did a small pull putting the pedal down about 3/4 of the way no codes, did another, pedal all the way down and it threw the codes again anyone have any idea what I’m dealing with here ?

[swellengear]

What car/year etc?

30BA and 30BB point towards a defective DME. If you have the MSD80 DME, this is a common fault. Your 2DEC code, MAY be the cause of the other codes. Start by checking all your battery and + connections.

[Wagner88]

It’s a 2010 135i

[Wagner88]

Also what connections do you mean besides the actual battery terminal?

[ShocknAwe]

2DEC may be your IBS, usually built into the negative lead I believe.

Is your battery full charge?