The general meaning of the engine C1890 Code is found online and the automobile meaning of the code is called general meaning. The general meaning of the engine code is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 8 for Ignition System Or Misfire. 7 for Vehicle Speed Output Circuit and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. Do not use this meaning for fixing the car engine but you can read it for learning the car engine problem about. It helps you to solve the car engine problem.