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  1. W

    p1153 even with 2 OEM o2 sensors

    I don’t think the gas here in Utah is 80 ppm sulfur based on the article link found below, and this doesn’t seem to be a “small refinery” issue. The state has made significant efforts to clean up Salt Lake City’s winter air. From the sounds of the TSB, it seems the dealership just adjusted the...
  2. W

    p1153 even with 2 OEM o2 sensors

    TL;DR: The issue was the TSB reprogramming (not the O2 sensors). When I replaced the part a year ago, I likely installed "new old stock" that premature failed. The second replacement was maybe "new stock," which the ECU read differently? Maybe they aren't exactly the same? Either that or my car...
  3. W

    p1153 even with 2 OEM o2 sensors

    See attached data. Trims don't change much at 1500 or 2k rpm. Even though the sensors on bank 2 sensor 1 and 2 are either brand new, or replaced last year. I think I'm going to swap out the Upstream sensors this weekend and see if the code follows the sensor. And if that doesn't work I guess I'm...
  4. W

    p1153 even with 2 OEM o2 sensors

    Nope, bone stock. Yes the fuel system management is going into closed loop and staying there. Short term and long term fuel trims are lower on bank 2 versus bank 1...but I don't know why. Should I pull the fuel injectors out and test them one by one? Or at least ohm out? My next test I think...
  5. W

    p1153 even with 2 OEM o2 sensors

    Hoping to bump this for any feedback. Still not able to isolate the issue. Here is what I have done more since the last post: Connections: All clean and good. Fuel pressure: About 60-65 psi key on but not running, and 42 when running which seemed somewhat low...but within the low range of...
  6. W

    p1153 even with 2 OEM o2 sensors

    2008 Yukon XL Denali, 6.2L AWD - P1153 (Bank 2 Sensor 1) code even after replacing the o2 sensor. Replaced Sensors: About a year ago I replaced both the upstream and downstream sensors on that side with AC Delco ones of the same part numbers when it had codes, which worked well for about a...
  7. W

    GM 6L80 Transmission Information Thread

    I will inspect as suggested but this post makes me want to just suck it out from the top, refill, and then maybe still pump it out of the trans cooler return and call it a day. Dont want to mess with the filter/gasket/exhaust bolts. Especially when I don't think the exhaust bolts would come off...
  8. W

    GM 6L80 Transmission Information Thread

    Is it worth changing the trans filter with an AWD and only 30K on the trans and no towing? I have a 2008 Denali AWD. The previous owners put a crate trans in it about 30K miles ago. It is a people-mover and almost gets no towing. I am tempted to suck out the pan from the top, add fluid, and...
  9. W

    Would pulling a vacuum on the PCV side of the crankcase restore lost power from worn rings?

    Thanks for the info. Found another thread with the TBS and updated part numbers for the valve covers. I am the 3 or 4th owner so don't know if it's already been updated so I guess I have to find the part numbers before I tear it apart. As for the reasons for my thoughts of pulling a vacuum on...
  10. W

    Would pulling a vacuum on the PCV side of the crankcase restore lost power from worn rings?

    My 2008 GMC Yukon XL Denali (6.2L AWD) has 250K miles and has blowby and presumably worn rings and burns oil. I have read good things about "engine restore" additives, but not ready for that yet. I replaced the valley pan gasket this weekend and the intake had about 1/2 a cup of oil in it when...
  11. W

    Diagnosing the heated seats switch on the passenger front - no LCD and no backlighting

    Update: I pulled the switch apart, resoldered as many of the joints on the board as I could reach (and when I say resolder, I really just remelted the exiting solder by touching the contacts, no new solder was needed), plugged it in and the switch is working like normal. So before you spend $75...
  12. W

    Diagnosing the heated seats switch on the passenger front - no LCD and no backlighting

    There's a bunch of software you have to install in order to get the computerized version of the Tech 2 scanner working. On Amazon they're only about a hundred bucks, but they basically run on a software and it isn't working on the computer. I have to get it all reconnected. There's some videos...
  13. W

    Diagnosing the heated seats switch on the passenger front - no LCD and no backlighting

    I actually have a Tech 2 scanner that I bought on Amazon but it's gotten disconnected and I have to figure out how to get it all reconnected. I didn't even think about using that. I think I'm going to try soldering the wires first it's going to be quicker than trying to figure out how to get the...
  14. W

    Diagnosing the heated seats switch on the passenger front - no LCD and no backlighting

    Update: Just found this: Going to try this next. I will keep you all posted.
  15. W

    Diagnosing the heated seats switch on the passenger front - no LCD and no backlighting

    2008 GMC Yukon XL Denali, just the front passenger seat is not heating. The powered seat controls all work in the front on both sides, and the heated seat on the divers side works fine, just the passenger heated seat button is unresponsive, so not a main fuse issue. Looking at the wiring...
  16. W

    Short vs long term fix for low oil pressure on 6.2

    I think all in all it took me about 5 hours but over 2 days so not as bad. I just did it at home on my back no special tools or a lift. I wish... I did not have to end up dropping the entire front differential. I just unbolted one side and supported it with a jack and supported the rack and...
  17. W

    Short vs long term fix for low oil pressure on 6.2

    Update: Dropped the oil pan, replaced the pickup tube o-ring, which was not flexible at all, and cracked it into 10 pieces with any movement....and sure enough it fixed the oil pressure. Now the pressure is back up to about 20+ psi at a warm idle....of course now I have a bigger oil leak than...
  18. W

    Short vs long term fix for low oil pressure on 6.2

    Yes, I think I am going to do this first as its quicker and may save me the work on the bottom end.
  19. W

    Short vs long term fix for low oil pressure on 6.2

    Running a Wix XP filter...
  20. W

    Short vs long term fix for low oil pressure on 6.2

    Yes, I found a video that showed dropping it part of the way but not actually having to pull the entire differential. Still a big job but on my shortlist. No funny noises, just drop down to 5-10 psi on the gauge when idling at a light and warm. No warning lights or messages. I guess dropping...
  21. W

    Short vs long term fix for low oil pressure on 6.2

    Yes, I did a oil change today and I also did a engine flush at the same time. I would say it helped the operating pressure when driving to be more like 30 or 40. But still the idle pressure when it's idling it like 700 RPM seems like the oil pressure is only like 5 PSI. This is concerning to me...
  22. W

    Short vs long term fix for low oil pressure on 6.2

    I have a 6.2 on a 2008 Denali. Pretty sure it has VVT. Trying to diagnose a low oil pressure on 232,000 mi . No knocks no check engine oil light. I've installed AC Delco sending unit and screen. Still low. Using a wix gold filter and 5W30 high mileage synthetic. Warm Idle pressure is at maybe...

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