GX550 Luxury + at the dealer for a new transmission (5k miles)
- Thread starter RAVEN550
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Could you provide additional details on the issue you were experiencing? When I come to slow stop, it feel a double bump. Kind of like a hard downshift just before I come to a complete stop. It happens about 25% of the time, I cant figure out what conditions trigger it and why sometimes it comes to smooth stop with no thump.
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- #4
That was my exact issue. It occurred for me at least 50% of the time.
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- #5
I'm not sure, but they just called back and said it needs a new transmission, which is on back order. The expected delivery date is currently the second week of November.
The truck's automatic transmission drops into 1st gear at about 3 mph. Sometimes it's more noticeable than other times.
Even when you have the transmission in "manual" mode, you can watch it automatically downshift as you slow down. If you watch the manual gear display in the heads-up display you'll see M1, M2, M3, etc. displayed. If you're up to speed on a typical road at about 45 mph and you're in M6 or M7 for example, then you slow down for a stop light but you don't manually downshift, you can see the transmission downshift on it's own as you slow down. M6, M5, M4, M3, then M2 as you get below about 10 mph, then it snaps into M1 at about 3 mph.
The downshifting is too aggressive on this truck, in my opinion. This truck doesn't "coast" well at all. It's always dragging itself to a stop with the over-aggressive downshifts, even in Eco mode. I understand that the downshifting prevents the transmission from hunting for gear and lagging in acceleration, but you'd think they'd let it sail along in a tall gear when you take your foot off the gas in Eco mode.
Mine in OT model
I've been paying more attention. It only happens after I've been driving about 30 minutes or so. The transmission stays in 2cnd or 3rd while I slow down for a stop, and then right when I stop (well below 3 miles) it bumps, sometimes twice, with a hard downshift to 1st. When the vehicle has been driven less than 30 minutes, the downshifts at very low speed just prior to stop are smooth and occur at higher speed not right when I stop.
I'm starting to think what I'm noticing is normal downshift behavior/programming to first gear. I tried pushing the tow/haul button next to the driver mode dial and it definitely makes that downshift thump when coming to slow stop but even more aggressively and reproducibly than when the tow/haul button is off.
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