Chevy Fault Code U0420

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What is the p0420 fault code and what are its causes?

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I'm getting error codes: p3055, u0420-71,c0800-03. 2017 malibu premierP0420 code gmc terrain 2004 chevy silverado 5.3 l check engine light code p0420 an p4030 bothP0420 chevy code gmc buick chevrolet engine light.

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Trouble code solution p0420: decoding, causes, resetting, meaning .