2009 LTZ Trailer Brake System

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mhoff1993

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My 2009 LTZ had the "Service Trailer Brake System" light came on. I find an article which advised to replace the trailer brake system relay which I did. However the light is still on. Does anyone have any other suggestions?
 

mhoff1993

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And here I thought this was a Tahoe site where someone could get some advise? Boy I was apparently mistaken about this site.
 
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