The engine C1738 Code is important thing and real meaning is necessary to know. Do not use the general meaning or automobile dictionary meaning for solving the car engine problem. The general meaning of the code is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 3 for Cruise Control Servo Indicates Low and 8 for PCM Stack Overrun. Do not follow this meaning. Because this meaning of the code may open more problem for the car. Do not drive the car until the car engine is fixed properly.