The B2170 Code explicates the real problem of the car engine and it is required thing if you want the car engine problem to solve. Do not use car engine dictionary meaning for solving the problem. The general or the dictionary meaning of the code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 2 for MFG – Manufacturer Specific. 1 for Transmission. 7 for Vehicle Speed Output Circuit. 0 for Transmission Engaged at High Throttle Angle. The basic meaning of the code is no so important thing for solving the issue from the car engine.