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Reply To: Code DTC P1400 on a 2009 Yukon Denali 6.2

August 6, 2016 at 5:39 pm #135382
Cowboy5054
Participant

I got the same code. Along with 0171,1400, p0300 0301 p0306 p0599 2006 4.8.

Frustrating and it all started with an air filter replacement and fuel injector additive. A week before it ran better than when I bought it new.

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