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Now I have a CEL flashing along with my TCS lights. My guess is a missfire in one of the cylinders.
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Body control module , I'm telling you look into it I remember hearing multiple times that the avalanche has bcm problems.
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Check how many times it flashes then goggle that
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It's definitely not the BCM, even though I know it is prone to problems. Truck ides really stupid so I took to a buddy who has a cheap scanner and pulled a P0307 which is a misfire in the #7 cylinder.