This B1773 Code is associated with the engine and when the car engine is diagnosed and the B1773 test is not done successfully, then the code appears. The code means B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 7 for Vehicle Speed Output Circuit and 3 for Transmission Control Module Reprogrammable Memory. You need to get more information like manufacturer name and model number to getting the real meaning of the code. You have nothing to worry when you transfer this car to professional to solve the problem.