No signal or brake lights and dash display "System Stability Disabled"

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Joined
Dec 6, 2012
Posts
61
Reaction score
2
Location
LI NY
2005 Yukon XL SLT
Everything worked about a month ago when parked (waiting for replacement PCM) today i get in and notice the fast flashing signal and no brake lights Fuse is good.
Where to start?
Thanks for your help
 
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