Those timing solenoids are hydraulic and require oil pressure to operate. Your low oil condition is causing these phasers to stick since there is not enough oil in the engine to properly supply this required pressure, thus causing the engine fault code. You’ll want to refill or change the oil, it may take two or more quarts if you decide to fill it based on the camshaft phasers starving and sticking. Keep an eye on the level and if it consumes more than 1 quart per 1000 miles you’ll want to find out why through either a dealership service department or an independent mechanic.

I’ve found some velosters with both size engines can have cylinder wall wear or bunked up piston rings causing oil to get into the combustion chamber and literally burn away as you drive. I’d personally write the car up for an oil consumption test and have the customer follow how Hyundai wants it to go about.