The engine B1720 Code should remove from the car code reader and until you fix the issue from the car engine, the code does not go away. You should know the meaning of the code and you can get the meaning of the code if you have all necessary information and tools for solving the problem. The dictionary meaning of the code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 2 for Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 0 means Transmission Engaged At High Throttle Angle.