(if your able to...)Go into dash and check the accell sensor... Make sure it has signal on both A and B. Make sure sensor has voltage to it. Check to see it has a consistant sweep as you push accelerator. You can do the same at the sensor if needed.
This code is saying your accel sensor and throttle sensor aren't tracking within 15%. Hope it helps. (If I had to guess I would say you have to replace the accel sensor on pedal.)