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    2012 Yukon Denali stock suspension, between 10 to 15 mph the front end sways

    Says it's PUBLIC
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    2012 Yukon Denali stock suspension, between 10 to 15 mph the front end sways

    I put it in the air and found nothing obvious. This is a rear wheel 2wd truck so no front CV axles. All ball joints look fine. There is a little play in the bearing when I move the tires side to side but it's very small. Here is a video of what is happening around 12mph and the truck starts...
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    2012 Yukon Denali stock suspension, between 10 to 15 mph the front end sways

    I can see the front end move while driving. Front end makes no noises while this happens. I have done no recent work to the suspension or tires. This happens while driving straight at 10mph to 15mph and is very noticeable like the front tire might come off. Once at higher speeds it does not do...
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    2012 Yukon 1500 XL Denali 6.2L while driving truck shudders, rpms run up and down until engine dies. Update at #44

    No answer ok. Thank you for everything else.
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    Truck stalled while leaving parking lot. What may have caused this?

    @kbuskill Thats what happened to mine and is the reason for installing a new one, installing a new canister and blowing the lines out when I also changed the fuel pump.
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    Truck stalled while leaving parking lot. What may have caused this?

    @j91z28d1 I'm actually hoping whatever is causing this has a hard failure or falls off the truck so I know what's causing it.
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    Truck stalled while leaving parking lot. What may have caused this?

    @rdezs On post #8 I mentioned replacing the purge solenoid and I did use an AC Delco one. I tested it two days ago and it tested SAT.
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    Truck stalled while leaving parking lot. What may have caused this?

    @Joseph Garcia Back on post #8 I mentioned replacing it along with other parts.
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    Truck stalled while leaving parking lot. What may have caused this?

    Is it normal for the fuel pressure sensor values to go up and down. I connected my scanner and recorded the pressure requested, pressure sensor voltage and pressure sensor pressure while driving. While cold 57 here this morning and before the truck was warm the values were up and down from...
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    Truck stalled while leaving parking lot. What may have caused this?

    @Doubeleive First we all have to remember this truck is my wife's 99.9% she is driving it and what she sees and tells me won't be as thorough as what we would see and look for. This time when this truck stalled on her in the parking lot it sounds very much like when my Dodge Ram 5.7 1500 stalls...
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    Truck stalled while leaving parking lot. What may have caused this?

    @Joseph Garcia I tested the pressure while sitting in my driveway and not driving around. The pressure in park and turn the key to on but not start is 58 (prime). The pressure when the key is turned to start in park goes up to 60 and then as idle drops to normal 600rpm the pressure is 43psi...
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    Truck stalled while leaving parking lot. What may have caused this?

    @SpareParts No Sir the problems with this truck started before I installed the AFM disable. The AFM disable install was an attempt to isolate this problem by preventing the engine from shifting back and forth from 8cyl to 4cyl at low speeds where I'm having this surging problem. But then it...
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    Truck stalled while leaving parking lot. What may have caused this?

    @Fless Yes Sir I used my scan tool to perform the relearn after replacing the crank sensor.
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    Truck stalled while leaving parking lot. What may have caused this?

    @j91z28d1 replying to your thoughts and thank you for the input. I installed a brand new OEM negative battery cable set and cleaned all connections. No issues filling the tank and I did replace the EVAP purge solenoid and tested it good. MAF sensor is bran new and looks to be working normally on...
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    Truck stalled while leaving parking lot. What may have caused this?

    I tested fuel pressure and fuel trim at idle and at 2000rpm: FUEL TRIMS: Look normal and so do the O2 sensors. IDLE STFT BK 1 0 to 6 STFT BK 2 0 to 6 LTFT BK 1 1 LTFT BK 2 1 2000 RPM STFT BK 1 -3 to 2 STFT BK 2 -3 to 2 LTFT BK 1 0 LTFT BK 2 1 Fuel...
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    Truck stalled while leaving parking lot. What may have caused this?

    I placed a fuel pressure gauge on this truck and it tested at 43psi at idle. I'm told that's normal for a FLEX fuel engine. All last week this truck drove just fine every day. Yesterday after sitting all night it was driven about 50 miles with no problem. My wife parked and went inside a store...
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    Truck stalled while leaving parking lot. What may have caused this?

    2012 Yukon Denali 6.2L 6L80E 171000 miles. I have been driving this truck for over a week with no problems at all. Wife drove it 40 miles one way with no problems. On her way back after driving about 10 miles she stopped at a store. She started the truck and backed out of the parking spot and...
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    2012 Yukon 1500 XL Denali 6.2L while driving truck shudders, rpms run up and down until engine dies. Update at #44

    @donjetman and @NickTransmissions Would the pressure test show the faults donjetman shows in his video link? If I had the same problem would my pressures have been different?
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    Transmission Codes P0842, P0872, P0877**UPDATE**

    @NickTransmissions and @donjetman Would the problem donjetman describes and provided great photos for show up while pressure testing the 6L80E transmission with a gauge?
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    2012 Yukon 1500 XL Denali 6.2L while driving truck shudders, rpms run up and down until engine dies. Update at #44

    @NickTransmissions I was going through TSBs for my truck and found one that describes what mine is doing but it says the TSB is for 5.3 engine instead of like mine which is 6.2. Vehicle owners may report a flare—an engine rpm increase during the shift—when the transmission shifts from 2nd to...
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    What is the best scan tool for diagnosing automatic transmissions?

    I'm looking for the best bidirectional scan tool under $1000 that offers the best diagnosing for transmissions as well as everything else?
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    2012 Yukon 1500 XL Denali 6.2L while driving truck shudders, rpms run up and down until engine dies. Update at #44

    I just pressure tested my 6L80E with a mechanical gauge screwed to the line pressure test port on the passenger side next to the bell housing. (7/16 bolt). Engine at normal temp of 210F. @NickTransmissions P R N D M M2 M3 M4 M5 M6 IDLE...
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    2012 Yukon 1500 XL Denali 6.2L while driving truck shudders, rpms run up and down until engine dies. Update at #44

    I'm in southeast GA. If somehow I were to need a 6L80E transmission or rebuilt one? I have rebuilt engines and TH350 transmissions. Is rebuilding the 6L80E something I can rebuild myself? What rebuild kit would you recommend as there are so many out there including EBAY and AMAZON etc? I know...
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    2012 Yukon 1500 XL Denali 6.2L while driving truck shudders, rpms run up and down until engine dies. Update at #44

    @NickTransmissions Good morning Sir! Subscribed to your YOUTUBE channel by the way and please don't get rid of it. I drove this truck again this morning and nothing happened as it drove normally and now that the engine is warm it will be fine. My problem happens at low speed randomly when the...
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    2007 - 2014 GMC 6.2L engine and 6L80E 6spd trans - random surging while accelerating at speeds under 45

    Looking for anyone else out there using this engine and transmission having similar problems. 170000 miles on mine. I have searched the internet and cannot find anything. This problem throws no codes or check engine and is random. For instance mine went 9 days without a problem and then one...

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