Explanation of this car engine P2654 Code tells about the car engine problem. You can easily solve the car engine problem fast if the real meaning of the code is found fast. The powertrain is here faulty and this problem should be fixed if you do not want to add any other problem. This engine problem is general and it is not very difficult to solve. A service of the car engine quickly lamp will be illumined since a code is stored in the PCM. Roughness at idle, poor engine act, and choppy hurrying may also attend the service engine soon lamp.