The 9-speed transmission in our 2017 Premier 2.0T with 13500 miles slipped for a second when starting out from a stop and then "grabbed" and took off.
Our problem seems to be resolved: The Check Engine light came on due to the the slipping when starting out from a stop. The dealer found codes P0700 and p2820 which relate to the transmission and transmission solenoid and also bulletin 18-na-081 which called for a TCM reprogram. That was 6 days ago and it has been running correctly since.To the question about the "check engine" light coming on - Yes the transmission will get to the point that the check engine light comes on. Mine stayed on for a couple of days and went out again. But that is what is helpful at the dealer as they can still retrieve the codes. There are two codes that show up ( I don't have them memorized)
UPDATE: To the other poster about the 9 speed starting in 2017. Yes it was the 2017 Premier that had the 9 speed transmission. That might explain the First Year Glitches.
With the dealer finding the two codes P0700 and P2820 relating to the transmission solenoids and the dealer only reprogramed the computer? Was the transmission worked on or the solenoid pack changed out ?
Let us know what happens. Had the car been in for service recently? (I'm always suspicious that something was done such as updates applied to the computer. We had another GM in the 2000s that had something like 8 re-programs applied over the 3 years trying to solve a stalling problem.My 9-speed has started recently to shift hard into what I think is 3rd gear... Of course no codes and dealer will never replicate because they don't know how smooth this trans shifts normally.....25K miles
As others have stated, unless the Canadian warranty is different than the US one (unlikely), then that dealer is robbing you. Any powertrain issues are covered 100% by the extended powertrain warranty including any diagnostics. Go back to your documentation (owner's manual and/or warranty booklet) and read it for any caveats that exempt diagnostic charges, it's likely not in there.Update:
Was just the software update for the transmission, like the TSB says.
Only cost the price of the diagnose fee ~$135 CAD. Not covered under powertrain
I've heard of this problem & now I'm a victim. 10K on '17 Premier. I think the precipitating factor was when I had to accelerate & then brake quickly. Trans got confused & next thing I've got the engine light & couldn't accelerate without high RPMs (4K at 40 mph like you). Was on vacation & got lucky with Chevy dealer who took pity. Two hrs. later & a reprogramming got me fixed (P2820 error code). Hope the fix sticks but GM should recall the 9 speed for a reprogram at least before somebody gets killed. It could have been hairy in my case & maybe others were not so lucky.Update: The transmission slipping happened again today and the Check Engine light came on. I immediately started for the dealer. Something new: When I got on the freeway, it wouldn't shift into higher gears and it was showing roughly 4000 rpm at 40 mph. When I got off the freeway a couple miles later, everything was back to normal as far as the shifting goes. The light stayed on. When I got to the dealer, their transmission guy was gone so I left it and they'll check it out tomorrow.
Not too happy about all this. :frown: