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  1. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    Oh, the vin number on the door sticker clearly states 2008 and the manufacture month as 10/08. There is absolutely no chance that they could have gotten it wrong except for negligence on their part or their computer system has the wrong information. Either way it is clear negligence and/or...
  2. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    I went directly to the OEM manufacturer site and looked up what vehicles the pumps the dealership was giving me went to - they were the pump designed for a 2007 and earlier Yukon which is not compatible with the 2008 and later. The 2008 and later Yukon with the 6.2 motor use a different pump...
  3. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    OH! I just figured out what is wrong here! I looked up the part number for the pump to see which vehicles use this particular pump. They have been giving me the pump for a 2007 and earlier Yukon. The 2008 Yukon use different pump and the ones for the 2007 are not compatible.
  4. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    Nope. It's not a flex fuel and I didn't put E85 in it. The vehicle is just a piece of junk from the get go.
  5. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    All that has been checked and there is nothing wrong with evap system. P0191 abd P069E are the only codes being thrown simultaneously after simultaneous provisional codes for the same thing are thrown. Those are the only codes. Then performance deteriorates and the only thing that can be done to...
  6. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

  7. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    Nope. Everything is as it should be. It started when I replaced a fuel pump that was leaking out the top and pouring gasoline all over the ground. All I did was switch out the original OEM pump for a brand new OEM pump. Nothing changed except the pump which turned out to be bad right out of the...
  8. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    No, this Yuke uses a returnless system. The evap system has absolutely no faults. In fact, everything is within specs except the fuel pump pressure (and I keep getting defective OEM pumps right out of the box one after the other). I ordered yet another fuel pump that is claimed to have been...
  9. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    I replaced the sensor a couple of hours ago to see if that was the problem and it was not. In fact, it made it worse. I put the old sensor back in and it got even more worse. All the live data confirms the sensor is working correctly, the ECM, BCM, FPCM, etc., etc., etc., have literally been...
  10. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    I switched out three (3) new pumps today and each one was in varying states of non-functionality. Can you imagine dropping the same fuel tank and replacing the pump three (s) times in one day and replacing all the modules that appear to be fine with brand new ones and get the same exact results...
  11. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    The only problem with that is that the required volume of the fuel being delivered at that pressure is controlled by the FPCM driving the speed of the fuel pump and it will cause a lot of other issues that won't be able to fixed.
  12. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    I tried that. The fuel pressure key on is 40 - 48 psi and fluctuates with every key turn. One time it will be 30, the next will be 48, then all random pressures with each key on test. The live data coincides with mechanical gauges exactly. Pressure drops even lower when the motor is running. The...
  13. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    I've had it with this 2008 Yukon There's no fixing it at all. I'm stripping out all the new parts I put into this issue, returning them all for my money back and sending off the crusher at this point. I have gone through a total of 7 defective out of the box GM OEM fuel pumps from the...
  14. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    It started after I replaced the rusted out pump. It turns out that it isn't the pump. It was an ECM error (I'll explain at the bottom of the post). P0191 code. Mechanical data identical to the live data. And the pump was not up to specs, but it wasn't the pump. (see bottom for...
  15. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    I figured out what is happening - Detailed description at the bottom of the post. I discovered the issue upon watching the live date (see end of this post). It's a P0171 that is up and triggering the ECM to query the FPCM - it's the brand new pump - defective. I did another diagnosis today...
  16. G

    2008 Yukon Denali - $3000 dollars in repairs and I still have P0171 and P069E DTCs.

    This is getting insanely frustrating. 2008 Yuke with 6.2L. Replaced rotted out leaking fuel pump, now I have unending p0171 and p069e codes that only occur on a cold start-up or if the motor is off while hot for more than 15 minutes. The codes pop up exactly 30 seconds after startup (a...
  17. G

    2008 Yukon Denali - New Fuel Pump issues (P069E and P0191 codes)

    That's the documentation I was also provided by the GMC Service department at the dealership. So, I decided to do a little test just to see if the pressure sensor was functioning properly. I rigged up a proper power supply and used my multi tester to see how the pressure sensor was behaving. To...
  18. G

    2008 Yukon Denali - New Fuel Pump issues (P069E and P0191 codes)

    That is a distinct possibility. I went through three brand new OEM GM pumps and the 4th one is racking up the same codes. The dealership checked the FPCM and the pressure on the fuel rail, etc., and said the FPCM was good. So, for a number of reasons, I think the fuel pressure sensor is...
  19. G

    2008 Yukon Denali - New Fuel Pump issues (P069E and P0191 codes)

    Installed new OEM fuel pump and I am now getting the P069E and P0191 fault codes. Occurrence: These coded light up the CEL about 2 minutes after a cold start. If I clear the code after the engine reaches operating temperatures, the codes do not appear until the next cold start. Checked the...
  20. G

    Rear window washer fluid line leak - 2008 Yukon Denali

    I've got a leak in the washer fluid delivery line to the rear window. The line has split, so, when you put fluid in the main reservoir and try to get washer fluid to the rear wiper, no fluid is delivered, I get a big puddle on the ground at the rear driver's side right at the corner of the back...
  21. G

    Mystery Oil Loss - Where is the oil going? 2008 Yukon Denali

    Interesting points. The oil level drops over night by a quart while the vehicle is sitting. Let me do a deeper dive into the phenomenon. I drove from North Carolina to my new house in Arkansas while pulling a trailer using the trailer/tow mode as per the owner's manual. This alone would...
  22. G

    Mystery Oil Loss - Where is the oil going? 2008 Yukon Denali

    I thought of that exact possibility. The plastic gallery for the intake has a catch can, but it's dry as a whistle, but that's not the only path oil can be sucked up into the intake manifold and leave no oil in the catch can. There is an after market catch can you can add if you don't already...
  23. G

    Mystery Oil Loss - Where is the oil going? 2008 Yukon Denali

    Funny you should mention the RPM issue. I was talking to a friend in Tennessee who said that his '08 Puke started doing this after the first time he used the 'trailer/tow' feature to pull a trailer and never quit after that until he literally flooded a solvent (he used MAF sensor cleaner) into...
  24. G

    Mystery Oil Loss - Where is the oil going? 2008 Yukon Denali

    I thought about that updated valve cover issue and I'm going to look into it.
  25. G

    Mystery Oil Loss - Where is the oil going? 2008 Yukon Denali

    This one is baffling. I mean, truly baffling. The issue: Intermittent oil loss of at least one quart of oil. I had the oil uptake O ring and oil pump on my Denali for the usual reasons. Now the problem is even worse and has become absolutely bizarre. OK, so if I drive 1000 miles at highway...

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