You can know the automobile meaning of the engine C1843 Code and do not use this general meaning. The automobile meaning of the engine 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. 3 for Cruise Control Servo Indicates Low and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. The car engine has the chassis and this code is related with the chassis and it is not difficult to fix the car engine problem. Do not drive the car with any engine problem.