Transmission thump

[vanilla.j_]

Happy Friday folks,

Was at a ramp light and when I took off was gradually going higher in the revs, 2nd gear, then shifted, made a loud thump noise within the cabin and now transmission and engine feel laggy. Car says a "drivetrain malfunction".

What do we think this is?

UPDATE: Just drove it after a few hours to work, car turned on and shifted like normal while cruising. Did tell me the same malfunction code but went away after driving

[BeachM5nster]

no clue. whats the code?

i'd take it to the dealer

[dzm3]

Spark Plugs.

[M5Rick]

Doubt if it's spark plugs,would be a misfire then. Check your diff support for wear if ok see if your losing dct fluid.