The accelerator pedal sensor (APS) indicates the position of the accelerator on vehicle models with electronic throttle control. The APS is basically a throttle position sensor (TPS) with a pedal attached.

If your sensor goes bad, then the car's computer will receive inaccurate readings about the position of the accelerator pedal. This can cause your car to be sluggish, start jerking, have trouble shifting gears, or even stall in some cases.

To recalibrate the ECM and accelerator pedal, the ignition switch must be in the ON position and then the accelerator pedal must be slowly and fully depressed from idle to full throttle. Repeat the procedure three times.