The common meaning of the U1019 Code is automobile dictionary meaning what is obtainable online and it is not very helping thing for you’re the car engineer for solving the car engine. You need to collect the real automobile dictionary meaning from the automobile manufacturer. The automobile meaning of the code is common and you should not use this meaning. The general meaning 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 9 for Kick-Down Switch Failed Short.