The meaning of the engine P0681 Code can be found from the right source and the source should be car manufacturer. Do not use any other meaning of the code for solving the car engine. Do not use false meaning of the code for solving the car engine problem. You must not drive the car if the car engine is not fixed. If you do not know how to solve the car engine, you should not try to solve the car engine. Expertise is necessary for solving the car engine properly. You have to use some hand tools. Find the real cause of the problem and take step for solving the car engine properly.