The code C1930 is a meaningful thing what is related with the car engine. Once the car engine is fixed, you do not need to know about this code but before that you have to find the real meaning of the code and use it. Do not allow wrong meaning of the code and if you use wrong meaning, it may make more terrible problem. You should verify all symptoms and find the real cause of the car engine problem. Then, you can take necessary step for solving the car engine problem. This problem is easy to solve.