HomeAll RepliesRe: I Got a Code DTC P1400 on a 2009 Yukon Denali 6.2 Re: I Got a Code DTC P1400 on a 2009 Yukon Denali 6.2 Sponsored August 26, 2012 at 12:26 pm #40536 RjIONParticipant I’ll let the person that deleted double, triple, quadruple post explain. I guess you didn’t see it. Someone did … besides me. Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored