As far as the turn signals it could be the same ground issue.
2011 chevy silverado tail lights not working.
Faulty parking lights can be a common occurrence for any vehicle owner.
Duffy in modern automotive technology of course there is also the possibility of a hidden short.
All of the bulb sockets have their own ground wires and the ground wires on each side typically meet at a grounding screw which would be on the frame rail.
Rotted wiring connector on this 2016 chevy silverado.
If your 2011 chevy silverado came with a factory tow package or even if it did not there may be some connections that you will need to make under the hood to make everything fully functional.
Bad grounds were the cause of early 60 s passenger cars tail and brake lights acting this way.
Did a quick bypass to fix it.
Chances are the cause of the defective light or brake lights circuit on your chevy silverado is a simple problem.
Correct part replacements are 23295978 and 23295977.
Why won t my parking running lights work.
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Blown out light bulbs are the most common reason for why the brake lights not working but the tail lights are.
The possible reasons for brake lights not working but tail lights are.
You can take a look at the faq article i have linked at the finalizing connections for the brake controller section.