The U1015 Code is related with the car engine and this code has an actual meaning what you need to use for solving the car engine problem. The meaning of the code is U for Network Code Problem is climate control system, lighting, airbags, etc. 1 for MFG – Manufacturer Specific. 0 for Fuel And Air Metering. 1 for Low Coolant Circuit and 5 for Park or Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit. The U1015 engine code airs a kind of network problem. You should use expensive information for solving the car engine and if you do not know how to fix the car engine, then do not try to solve the problem.