Hey Scotty, I have a 2016 Buick Enclave and still have a little bit of the powertrain warranty left (at 57k miles) I notice the transmission would slip from second to third gear. But it only happens if I leave the engine on idle for 15-30+ minutes. The transmission oil has been done before to see if it would stop. But it didn’t obviously. Took it to the dealer for warranty work, but they can’t find the problem. So was wondering if I should dig deeper and make the dealer fix the vehicle as it’s still under the vehicle powertrain warranty? Or should I just leave it alone and baby it? Thanks!
It will not get better and you'll never be able to baby it enough. Call or take it to a good transmission shop for an independent evaluation. You should also call Buick to make a complaint so it will be on file for coverage consideration if there's trouble after the warranty expires. Don't just trust that the dealer has filed any paperwork
@darindux
But the thing is that the dealer couldn’t even find a problem. First went to the Buick dealer. Then they were able to at first, then the technician decides to quit. Brought back again, they couldn’t find the problem. Then went on to the Chevy dealer, they heard of the problem, but weren’t able to duplicate it
9T65 transmissions that GM uses have been problematic for years. They have a history of mechanical (internal parts) , electrical (solenoids), and software issues.
Low mileage failures are common and GM knows all about it.
Your problem could be resolved with as simple as a software re-flash or a multi-thousand dollar rebuild or replacement.
Ask around your neighborhood and find a competent independent transmission shop. Dealerships typically only replace complete transmissions.
@heyinway
I believe this is the 6T70 series not the 9T65
Same problems with both transmissions. Aftermarket has redesigned on remanufactured units to eliminate the original engineering flaws.