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2020 sierra 3.0l emission fault

Gwat1988
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Gwat1988 New Member

Gwat1988

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I have a 2020 3.0l with 14000 miles. Service emission system came on. Dealership checked wiring harness and put on a new ecm that didn't fix it. Egr and turbo code came on and they replaced turbo that also didn't fix it. Now they are ordering a new egr valve. They have had the truck for 1 month so far. And no end in sight so far for me. Anyone have this issue. 

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