The meaning of the U0104 Code must be related with the engine and general meaning of the code is found online. This code is available online and the general meaning of the code is U for Network Code Problem is climate control system, lighting, airbags, etc. 0 for SAE Generic. 1 for Transmission. 0 for IC Circuit High Voltage and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. You need to fix the car engine if you want to drive the car without any problem from the car engine. It is very easy to use general information but you need to get manufacturer information.