'03 1500HD Engine Code

My truck threw an engine code earlier this week.

It was a P0220 throttle/pedal position sensor/Sw B circuit malfunction.

Of course, the message came up about reduced engine power.

I turned the truck off for a couple of minutes, started it back up, and the malfunction was cleared up - for now.

What should I try and look for?

Thank you for any input.