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Got the P21DD error code yesterday
2015 2500HD Duramax --- 32000 miles
Emissions, probably something to do with DEF stuff. I have a 5 year extended warranty but being emiisions I hope I have no cost -- my $250 deductible.
Goes to dealer tomorrow.
Anyone else face a P21DD?
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T
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