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    2012 Yukon Denali XL with 6L80 and 6.2L. Oil leak at rear of engine?

    The way I look at is it will either stop the leaking or it won't. If it doesn't then I still have to fix it but for $20 it's worth the try.
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    2012 Yukon Denali XL with 6L80 and 6.2L. Oil leak at rear of engine?

    I have also read the rear cover gasket leaks more than the rear seal but the work is the same. Transmission has to come out to replace either. If you take it to a shop that's about $1200 to replace a $40 part. I'm going to try this stuff first "AT 205". I have seen lots of positive videos using...
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    2012 Yukon Denali XL with 6L80 and 6.2L. Oil leak at rear of engine?

    I looked again and it's bone dry. I wish it were that simple lol.
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    2012 Yukon Denali XL with 6L80 and 6.2L. Oil leak at rear of engine?

    I know the leak is not from the oil pressure sensor, the valve cover gaskets or the oil cooler gasket. All have been replaced less than 6 months ago and all have been inspected showing no leaking. As far as I know that leaves either the oil pan gasket, rear main seal or the rear cover gasket...
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    Well they drove it this morning and called to tell me it's fixed and come get it. They replaced the connector to the coolant temperature sensor. They found no other problems with this Yukon. Thank you very much for all of your inputs and guidance!
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    I hate newer cars with computers. So much simpler with a TH350 and a SBC.
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    @rdezs @Charlie207 @Doubeleive It's been at the shop all day and I just spoke to them. Thankfully they were able to recreate the problem while one guy drove and their diagnostic guy held the scan tool. While the problem was happening the coolant temp sensor showed -41 degrees. This is a brand...
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    I've tossed in the towel and took it to my local shop who's owner I've known for years. He says his diagnostic guy is very good. This truck sat all night and all day today until 630pm when I got in to drive it over and drop it off. Happened again with the same scenario: Get in and starts right...
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    this one is brand new
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    @Charlie207 , @rdezs I replaced New AC Delco fuel pump New Delphi MAF sensor New throttle body and did the relearn New crank sensor New coolant temp sensor New fuel injection sensor New battery negative cable set New spark plugs New coil packs New ground from engine block front to driver side...
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    I think the problem will be in this order either a bad: Original Fuel Pump Control Module Original Plastic Intake manifold and gaskets Original VVT solenoid and magnetic sensor
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    Did you use an AC Delco OEM fuel pump or an AMAZON fuel pump?
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    My Yukon has the FLEX engine and a few months ago I replaced my old fuel pump with a brand new AC Delco one. My fuel pressure under load is 43psi while driving. I checked with the scan tool and a gauge hooked up to the fuel rail taped to the windshield so I could see it (both 43psi). I've fired...
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    I let this truck sit overnight again and just started it and sprayed the intake manifold with carb cleaner to check for vacuum leaks. No leaks found. The problem with this truck happens while driving and while the engine is cold but does not throw a check engine light or DTC code. I can start...
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    2012 Denali with 6.2 engine shutting off while driving. Random

    2012 Yukon Denali XL with 6.2L and 6L80E at 172000 miles.The truck sat all night and today until 5pm when we got in it to drive up the road. Went two blocks at 15mph engine temp about 180. Foot on gas and in drive the engine starts surging and the RPMs run up to about 1500 and down to below 500...
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    I installed a brand new DELPHI MAF sensor yesterday and drove 80 miles round trip yesterday with engine warm at 210F. No problems. The truck sat all night and today until 5pm when we got in it to drive up the road. Went two blocks at 15mph engine temp about 180. Foot on gas and in drive the...
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    @Charlie207 At minute 3:14 (do not need to remove harness as he did). Disconnect the electrical plug and the line that runs to the EVAP canister. Start the truck and place your finger like he does and check for suction. Suction means it's bad.
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    The sensor I received in the Delphi box is a brand new Delphi sensor stamped DELPHI on the part. The best GM MAF sensor replacements are OEM parts from AC Delco or Delphi, ensuring precise calibration and preventing poor engine performance, stalling, or false codes common with aftermarket brands.
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    Just installed a brand new DELPHI OEM MAF sensor. Next will be all 4 O2 sensors (these are the factory originals now 14yrs old).
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    Purge solenoid takes about a minute to test. Unplug electrical and unplug the line to the canister. Start the car and if there is vacuum at the solenoid it's bad. Mine is brand new. Negative battery cable is brand new.
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    Would that mean you have a vacuum leak at your intake manifold?
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    I've already checked the fuel pressures and they are good. I'll change the 02 sensors next.
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    Usually we just get in and go but may have to let it warm up and see if that changes what happens
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    [SOLVED] 2012 6.2L Yukon Denali XL 172000 miles? Need help and cannot figure this very random problem out.

    TOPDON bidirectional scanner Already fired parts cannon because there is no information about this problem anywhere on the internet. Replaced within the last 6mos OEM fuel pump and sensor OEM crank sensor OEM fuel injector sensor OEM coolant temp sensor Throttle body MAF sensor Coil packs...
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    How reliable are the 2011 Yukon Denalis?

    I've got a 2012 Yukon Denali XL 2WD with all the bells and whistles I'm selling. We need a 4wd where we are going. 172000 miles in white diamond pearl paint.

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