The engine code U1009 is related with the car engine and this dictionary 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. 0 for IC Circuit High Voltage and 9 for Kick-Down Switch Failed Short. The code is related with the network of the engine and it is necessary to get the manufacturer meaning for solving the car engine. Do not drive the car if you have faced any problem. However, you can easily fix the this problem with less amount of money.