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Hard to say. The BCM (Body Control Module) sends the power to the 3 lights separately. Maybe a BCM problem.

Have you verified the 2 normal brake light bulbs are OK? Some folks have reported both burning out essentially at the same time.

What year is your Traverse?
 

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Discussion Starter · #3 ·
I have not checked bulbs and assumed same time burn out wasn’t possible. Will try that first.

appreciate feedback
 

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Never say never. Once both my headlights on my firebird burnt out at the same time... I thought it was a curse because I hit a black cat seconds before that. Had to drive with my high beams on and the vehicles on the other side of the road were not happy.
 

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Discussion Starter · #5 ·
The 10amp fuse was issue and fixed the problem.
The “stop light” fuse controls left and right brake lights. Turns out the top brake light operates on a separate fuse and if that ever goes out, you’d have to read panel to find what controls it.

assumption was the same fuse controls all 3 lights but not the case.

hopefully it helps others along the way.
 

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Thanks for letting us know. Wonder why the fuse blew? I hope it was just a bad fuse and indication of a short somewhere. Keep an eye on it.
 

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Doesn
The 10amp fuse was issue and fixed the problem.
The “stop light” fuse controls left and right brake lights. Turns out the top brake light operates on a separate fuse and if that ever goes out, you’d have to read panel to find what controls it.

assumption was the same fuse controls all 3 lights but not the case.

hopefully it helps others along the way.
If both the taillight brake lights and the 3rd were all on the same fuse when that fuse goes out all brake lights would be out instead of just the taillights or 3rd.
 
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