General Motors has issued a technical service bulletin (TSB) for certain examples of the 2021 model-year Chevrolet Trailblazer subcompact crossover equipped with the available GM nine-speed automatic transmission for a problem related to the clutch spring retaining ring.
The problem: the clutch spring retaining ring may not be fully seated on certain vehicles equipped with the 9T4X nine-speed automatic transmission. In vehicles with this problem, a warning light indicating a transmission malfunction will appear on the gauge cluster/instrument panel, alerting the driver of the issue. This warning light will appear when the vehicle still shows low mileage on the odometer.
A TSB has also been issued for a similar problem in other GM crossovers equipped with the nine-speed automatic transmission, including the Buick Encore GX, GMC Terrain, Chevy Blazer and Chevy Equinox.
The hazards: GM’s service bulletin for this issue does not indicate what problems the transmission clutch spring retaining ring issue may lead to, although as noted above, the problem will produce a malfunction indicator warning light on the gauge cluster/instrument panel. Additionally, this problem will produce a diagnostic trouble code (or DTC) of P0747.
The fix: Chevy dealers will be instructed to inspect the transmission clutch spring retaining ring in affected vehicles. GM’s TSB indicates this particular service update “involves vehicles in dealer inventory only and will expire on February 22nd, 2022.”
Affected component: transmission clutch spring retaining ring.
Affected vehicles:
- 2021 Chevrolet Trailblazer equipped with 9T4X nine-speed automatic transmission
Contacts:
- General Motors TSB number: A202321841
- Chevy customer service number: 1-800-222-1020
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Comments
Looking for a day when there are no GM recalls or TSB’s.
Nothing new here
So will this affect the engaging of transmission? Reason asking, 307 miles on new Trailblazer and the transmission will not work. Car goes in gears but nothin happens. Started out forward movement then just dropped off like if foot slipped off oedal. Then RPMs ran up to 4000 without dropping down at 55 mph. Until I got car off turnpike and parked waiting on tow truck no thing now happens when car is put in any gear. Not too impressed with performance at 300 miles. Should have kept my Subaru.
Transmission problems 1047km..they said the reverse gear failed..going to overhaul transmission 1 part on back order no time limit as to when it will come in .I think they should replace who know what damage was done when it failed.Still having to make payments on vehicle less than 1 month old . Still happening 9months after first post
Good luck my Trailblazer left me sit on the turnpike last January with 300 miles on it. The entire transmission was replaced. It took 3 weeks to get the new one in. Garage was told to replace entire thing and not investigate to see what failed. The signs something was wrong, RPMs would climb up to 4000+ but never drop down to grab the next gear. I gad to creep off the turnpike at 10 m.p.h. in order to get picked up on roll back. By the time the roll back came vehicle wouldn’t move in any gear.
With my vehicle the rpm went from 2-5 down and back up again rapidly I was going up hill and it was really acting weird thought maybe some kind of hill assist but dash light came on so I knew something was wrong.I did make it to a near by dealer it was there I discovered I had no reverse.Dealer took Transmission apart reported to G.M and they will overhaul .I hope this is all that will happen .It takes the joy out of getting a new vehicle and feeling safe to go any distance .
I just got a trailblazer only had 2 months and there are issues with transmission. truck in shop already and I have a loaner. what is anyone doing about this. this truck was not free and I have to make payments on it. what should I do. is there an attorney already set up for this known issues that noone is providing to customers before buying the vehicle.