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The 2003 Solverado did not come with a 5.5L Vortec. The 4.3 V-6 and 4.8, 5.3, 6.0, and 8.1 were the coices fer the Silverado. The common spots are passenger fenderwell or behind the glove box. Good luck and happy hunting!

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Q: Where is the ecm located on 2003 vortec 5.5 Chevy silverado?
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