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I'm guessing this is a simple fix but I still don't know where to start.

None of the brake lights work when pressing on brake but they come on when the park light switch is on.

I highly doubt all the bulbs are partially blown if that's a possibility.

Check the fuse

I assumed it was a fuse, not sure which one

check the bcm fuses

The little button by the brakes pedal Is either damaged or unjacked. Take a look and see. Can't miss it

sound boy 64 wrote:The little button by the brakes pedal Is either damaged or unjacked. Take a look and see. Can't miss it

Ok thanks a lot, will do !!!

I have a similar problem, my brake lights are working good but the park light not coming on, I tried changing the socket, the bulb but the park light still won't come on.
The problem only exist on the left tail light though, any suggestions?

the jacks from the harness to the taillight socket are properly cleaned?
its possible its the ground for the light.

I'll check the jacks, but, would the ground affect only the park light?

Some of them use individual grounds per bulb and others use one ground.
If it's one ground well then irs not that. Get a tester and see the problem. Test light if no access to a dvom