Hi guys, I'm asking about an issue I encountered with my 2015 Suburban LTZ 4WD.
A month ago, all four parking lights (front + rear, driver side + passenger side) were gone at the same time, and after a few days, they all came back, and gone again, and back again, and today all the parking lights are suddenly gone again.
Over the past month, I brought the car to two local dealers, and they didn't find any problem with it (which is ridiculous). All the other lights, including the brake lights, headlamps, reverse, fog lights... are all functioning properly.
Except for the parking lights, there's no other issue with the car, and it drives smoothly.
So what could be the problem? Also wondering if anybody else encountered any similar issue like this? Thanks guys!

 

I would suspect a problem with the lighting control module.

Replacement most likely required.

 

I'd try replacing the PRK Lamp relay first. They are cheap enough.