My 2023 Colorado automatic transmission has an occasional slip when shifting from 1st. to 2nd gear. I have taken it back to the dealer for this problem. They gave me a printout that states Chevrolet does not consider this to be a problem and the slip will not affect to performance and durability of the truck, so they are doing nothing to correct this problem. I have been reading on the internet and it seems this problem is widespread. I have been driving mostly General Motors vehicles for the last 50 years and have never been told that a transmission slipping is considered normal. If this is the way GM quality is going, the next vehicle I purchase will certainly not be made by GM. I encourage everyone that is having this transmission problem to call Chevrolets consumer satisfaction number and voice your opinion. If most of us do this, surely, they will be intelligent enough to realize that this is hurting their reputation and will result in lower sales and most likely a class action lawsuit sooner or later. Good luck everyone and remember this the next time you go to purchase a new vehicle.
Chevrolet's response to transmission slips on 2023 Chevy Colorado's
Marty789
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When looking at buying a 3rd gen (in process) I noted that various internet sources listed different transmissions available. 8L45, 8L80 and one suggested 8L90. Which transmission are you guys talking about when mentioning the issues. Please correct what I've found if there's a single transmission used in all 3rd gens. Thanks
Kind of. For the 3rd gens it is a drain-back issue after shut down and only happens for most on the first 1->2 shift of the day. As long as you're gentle on the throttle for the first shift as you pull away from your driveway, it is hardly noticeable.
The transmission calibration definitely feels a bit awkward at times, but not necessarily in a bad way.
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1,690 Posts
Best way to tell 100% would be to check the RPO codes. Looks like Gherbert stated "There is a QR code either on the Driver Side Door Jam or in the Glove Box. Have to Scan that to get all the RPO Codes now "
C21964 wrote "From what I have read I believe the base WT gets the 8L45e (RPO M5N), then the HO versions get either the 8l80e (RPO code MFC) or possibly a variant of the 8l90e (RPO code M5U). " Which corresponds to the three variants I was finding and that led to my question.
My understanding is that its just the 8L45 and 8L90. Not seeing much out there on an 8L80.
https://en.wikipedia.org/wiki/GM_8L_transmission
I'm having no issues. Just replying to above posts questioning what transmissions were used.
Interesting, I wonder what the difference between the 8L80 and 8L90 is. Seems to be a lot of people out there that think/thought this truck has the 8L90 (myself included).
8L90 is what has been used in the Silverado/Sierra. I'm not sure of the differences myself.
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2,183 Posts
I think anybody who has bought a new vehicle ever, has had some kind of "it did something weird today" story to tell.
I know I sure do. The trick is finding a competent dealership who has competent employees who can properly diagnose and fix the problems while it is under warranty. That is like finding the Holy Grail, lol.
I know I sure do. The trick is finding a competent dealership who has competent employees who can properly diagnose and fix the problems while it is under warranty. That is like finding the Holy Grail, lol.
I just had this happen yesterday. 2023 TB with 1300 miles. I thought I was in neutral. It revved to like 4k rpm. I pulled over, put it in park and then back to drive. Hasn't done it again. But I see people are experiencing this sporadically.
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100 Posts
I've had it slip while cold, hadn't driven the truck for 2 days.
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