The diagnosis engine U1218 Code works for solving the car engine problem and the engineer needs to solve the car using proper information. The automobile meaning of the code is U for Network Code Problem is climate control system, lighting, airbags, etc. 1 for MFG – Manufacturer Specific. 2 for BBV Sensor Circuit Low Voltage. 1 for BBV Sensor Circuit Low Voltage and 8 for Transmission. Once the car engine is solved, you can take the car for a test drive. Do not follow wrong meaning of the code for solving the car engine. You may add more problems in the car engine.