P0013 code is a diagnostic trouble code and it is related with OBD-II equipped vehicles, with but not limited to Hyundai, VW, Honda, Toyota, Chevrolet, Audi, Acura, etc. There are some symptoms included like rough running, damaged computer and Faulty oil control valve. There are some causes faulty oil control valve, open or short in the OCV or solenoid valve and damaged computer. Preferably you will want to mention to a factory service manual for model specific and make phases and conditions. You should utilize a digital volt ohm meter and measure the resistance power of the point on the camshaft oil control valve.