The general meaning of the C1238 Code is available and meaning of the code is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 3 for Cruise Control Servo Indicates Low and 8 for PCM Stack Overrun. When you want to fix the car engine, then real meaning of the code is necessary but you will get general information from the automobile meaning. Meaning of the code is necessary to solve all problems. Do not drive the car if the car engine problem is not solved.