Is the circuit grounding out? Bare, broken, corroded, rubbed though wire?
Fuse for parking lights probably blown.
Blown fuse? Damaged buss board?
The headlights work on a totally different relay than the parking and fog lights. The headlight relay or headlight fuse is usually blown when only the parking and fog lights work.
blown fuse
The GMC dash tail and parking lights are on a different fuse from the brake lights. Check the fuses for a possible blown fuse.
Im 99% sure you have a fuse blown, its the parking lamps fuse. a fuse may be blown
Your parking lights may not be working due to a blown bulb or fuse. If you have checked both you may need to see a mechanic to make sure there is not any electrical problems.
tailight/parking/dash lights - look for blown fuse
Probably a blown fuse. What you need to find out is why the fuse blew.
you may have blown the computer chip that regulates your lights its usually your hazard lights button that's the chip.
If you have multiple lights that do not work it's probably caused by an electrical problem such as one or more fuses blown or a faulty connection somewhere.
Sounds like a blown fuse in the dash, no biggie, just take it in and it should be a quick fix Wiring harness has come loose, blown bulbs, or bad wire.