Piston Slap: 6L80E…eeeeeek?

Leather is better. (photo courtesy: image.automotive.com)

Nathaniel writes:

Sajeev,

Long time listener, first-time caller. I’m responding to your plea for new Piston Slap questions. I purchased a gently-used 2008 GMC Yukon Denali AWD a couple of months ago. Other than its appetite for fuel, the only negative is that it has 141,000 miles. I believe the previous owner changed the transmission fluid at 100,000 miles (Carfax shows that the transfer case fluid was changed at this point, and I can’t imagine doing that and not doing the transmission). The fluid was relatively clean but I changed out several quarts via the dipstick tube using a fluid extractor after I purchased the vehicle, replacing them with the specified Dexron-VI. I believe the fluid level is correct but it’s difficult to read.

On a recent road trip, the 6-speed automatic (6L80E) transmission stumbled during the 2-3 shift while driving through the mountains and went into a failsafe mode. The check engine light came on. I pulled over, turned the ignition off and on again, and the truck operated normally. The CEL remained on for the next several ignition cycles. When I called OnStar to obtain the fault code, they could not retrieve it because the CEL was no longer on.

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  • Tassos Jong-iL Not all martyrs see divinity, but at least you tried.
  • ChristianWimmer My girlfriend has a BMW i3S. She has no garage. Her car parks on the street in front of her apartment throughout the year. The closest charging station in her neighborhood is about 1 kilometer away. She has no EV-charging at work.When her charge is low and she’s on the way home, she will visit that closest 1 km away charger (which can charge two cars) , park her car there (if it’s not occupied) and then she has two hours time to charge her car before she is by law required to move. After hooking up her car to the charger, she has to walk that 1 km home and go back in 2 hours. It’s not practical for sure and she does find it annoying.Her daily trip to work is about 8 km. The 225 km range of her BMW i3S will last her for a week or two and that’s fine for her. I would never be able to handle this “stress”. I prefer pulling up to a gas station, spend barely 2 minutes filling up my small 53 liter fuel tank, pay for the gas and then manage almost 720 km range in my 25-35% thermal efficient internal combustion engine vehicle.
  • Tassos Jong-iL Here in North Korea we are lucky to have any tires.
  • Drnoose Tim, perhaps you should prepare for a conversation like that BEFORE you go on. The reality is, range and charging is everything, and you know that. Better luck next time!
  • Buickman burn that oil!