The meaning of the U1011 Code is easy to know if you read the car and car engine manual. Do not use automobile information for solving the car engine problem. The automobile dictionary meaning is not helpful for solving the car engine problem. Every manufacturer of the car ha a specific meaning and that they set for those car engine. You need to use that meaning if you wish to solve the car engine problem. You can read the general meaning or automobile meaning of the code to know about the problem. You should keep studying the actual information what your car manufacturer has provided.