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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  • Lorenzo They won't be sold just in Beverly Hills - there's a Nieman-Marcus in nearly every big city. When they're finally junked, the transfer case will be first to be salvaged, since it'll be unused.
  • Ltcmgm78 Just what we need to do: add more EVs that require a charging station! We own a Volt. We charge at home. We bought the Volt off-lease. We're retired and can do all our daily errands without burning any gasoline. For us this works, but we no longer have a work commute.
  • Michael S6 Given the choice between the Hornet R/T and the Alfa, I'd pick an Uber.
  • Michael S6 Nissan seems to be doing well at the low end of the market with their small cars and cuv. Competitiveness evaporates as you move up to larger size cars and suvs.
  • Cprescott As long as they infest their products with CVT's, there is no reason to buy their products. Nissan's execution of CVT's is lackluster on a good day - not dependable and bad in experience of use. The brand has become like Mitsubishi - will sell to anyone with a pulse to get financed.