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Code DTC P1400 on a 2009 Yukon Denali 6.2

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    • #38320
      C6RAPTOR
      Participant

      I have a 2009 Yukon Denali 6.2L. A few days ago it started to rough start in the morning when it was cold. The engine RPM would go from 0 to 1000 RPM and skip and sputter or even stall . After it started it ran great. SIS light came on. I had GMC dealer service look at it .
      They got Code PIP4693D: Intermittent SES light on cold start due to DTC P1400 – Due to Low Fuel Volatility.
      Was told to switch brand of fuel and switch to 87 octain. I have been using premium because I get better gas mileage with premium ,especially when towing. Has anyone else had this problem? I do not like the answer. I do not want to get spark knock that 87 octain gas could give me when towing.

    • #40510
      Vic1212
      Participant

      Hey C6RAPTOR, I just found this site and I hope this helps: http://www.cargurus.com/Cars/Discussion-t38450_ds499762

    • #40511
      Vic1212
      Participant

      and also maybe look at the brand of the oil too!

    • #40519
      carguy1701
      Participant

      Doesn’t sound right. Last time I checked, P14XX codes were manufacturer-specific EVAP codes.

    • #40521
      C6RAPTOR
      Participant

      The dealer gave me Document ID: 2519009 # PIP4693D for DTC P1400- Due To Low Fuel Volatility.
      Condition : Cold rough running/SES light when cold starting
      Recommendation: change fuel brand or switch to 87octane.
      It notes that: Slight spark knock may be noticed with 87 octane. This is not a good answer from GM.
      It also notes that this PI superseded to include results of the previously mentioned investigation Please discard PIP4693C

    • #40523
      Vic1212
      Participant

      So what are they going to have you do or what are they going to do?

    • #40526
      C6RAPTOR
      Participant

      I will change fuel brand first before I go to 87 octane. Like I said I did not like the fix. It sound like GM screwed up the works with this Flexfuel engine that should run n high test but does not want to start with high test. Maybe that was the idea for calling it FlexFuel. Start on 87 octane and then run on high test. I need to think about how to do that.
      I was dumbfounded when the service tech said i needed to change fuel brand or go to 87 octane. The GMC has over 22K on it burning mostly high test of the same brand.

    • #40527
      RjION
      Participant

      It would be good to see the 74 other times you got that code deleted.

    • #40534
      C6RAPTOR
      Participant

      RjION
      Please explain your comment.
      C6RAPTOR

    • #40536
      RjION
      Participant

      I’ll let the person that deleted double, triple, quadruple post explain. I guess you didn’t see it.

      Someone did … besides me.

    • #40537
      Alex Luft
      Keymaster

      @RjION that was me.


      @C6RAPTOR
      @RjION is referring to the multiple instances of this same thread in the Forum. Not a problem, I took care of it.

    • #40539
      RjION
      Participant

      OMG Alex …………….. I wudda neber guest

    • #40540
      C6RAPTOR
      Participant

      alex,
      thanks, my mistake. The Post did not seem to take the first 74 times i clicked.

    • #40541
      Alex Luft
      Keymaster

      Not a problem, @C6Raptor.

      Glad we can always count on @RjION to bring a healthy amount of sarcasm to the discussion.

    • #40543
      RjION
      Participant

      Always …………………

    • #40544
      Vic1212
      Participant

      wait but then what about that one subject that started with 2012 Traverse No bluetooth, that one has already 2

    • #40545
      Alex Luft
      Keymaster

      @vic1212 Took care of that one; thanks for the heads-up bud.

    • #40561
      Z15
      Participant

      Were you using Shell gas by chance? On another forum in section dedicated to 6.2L engines several owners were having cold start problems. Turns out once they shifted away from Shell premium to another brand, no more problem. I don’t have any problems with Shell in my 6.2L Sierra Denali but then gasoline is not the same in all parts of the country.

    • #40562
      C6RAPTOR
      Participant

      Z15,
      What forum had the section dedicated to 6.2L

    • #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.

    • #135394
      Alex Luft
      Keymaster

      I wonder if it has anything to do with that fuel injector additive, @Cowboy5054

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