The meaning of the code B2129 is necessary to know and if the real meaning of this code is unknown, it is impossible to fix the engine problem. Do not drive the car if you feel any problem in the car engine. An automobile engineer can fix the problem from the engine according to the model and manufacturer of the car engine. The automobile dictionary meaning for this code can give you basic information about the code. Do not worry if you have taken the car to automobile repairing center for test. The problem of the car may solved there easily.