The C1174 Code is related with the car engine and it is important thing if the car engine is necessary to solve. C1174 OBD2 specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illumined and the code will be set. Gasoline engines usage spark plugs to source an explosion of fuel within the cylinder. In a correctly timed engine, this burst happens at the proper instant to send the piston to the bottom of the cylinder and offer power to the drive shaft. If the plug wires are out of arrangement, the detonation happens at the incorrect time.