Long story short I had the coil ground wire disconnected, and connected it while the engine is running. It arced, then the car died. I tightened the ground wire, started the car right back up, but had a check engine light for codes 2bd4 and 2848. Codes won't clear, and it doesn't run very good (random stuttering on accel). I tested all fuses in engine bay and in passenger footwell and all are good. Am I looking at a fried DME? Anyone have any experience with similar? Car is a 2009 2 door 1.6l turbo mini Cooper S.

 

Looks like the 2bd4 code is an internal DME error indicating a voltage reference fault, translation: your DME is down for the count. You might want to see if there is anyone who can repair it as opposed to replacing.

 

ecu can be cloned but you need to find the exact same part number/revision to do it, and it has to be bench flashed. I did one, was not fun, also did immobilizer delete at the same time