GM’s Wild New 8-Speed Transmission Fix: Dealers Must Ask Permission?!
This video was first publish on Pickup Truck Plus SUV Talk
GM has issued an unusual new repair procedure for eight-speed automatic transmission shudder in the Chevrolet Silverado, GMC Sierra, Chevy Colorado and GMC Canyon.
Preliminary information bulletin PIP6127 changes what dealerships must do before replacing a torque converter under warranty. The procedure begins with changing the transmission fluid. If the shudder returns, the truck may require an extended road test and additional testing in manual seventh gear.
If the problem remains, the technician can move toward replacing the torque converter—but first, the dealership must contact GM’s Product Quality Center and receive authorization.
The bulletin covers:
2019–2022 Chevrolet Silverado 1500 and GMC Sierra 1500 models with the 5.3-liter V8 or 2.7-liter Turbo
2023–2026 Silverado and Sierra models with the 2.7-liter Turbo
2023–2026 Chevrolet Colorado and GMC Canyon models equipped with the 2.7-liter engine and eight-speed automatic
Why is GM adding another approval step? One possible explanation is that the company wants technicians to complete the entire diagnostic process before replacing expensive torque converters that may not solve the underlying shudder.
This is not a recall, and replacing torque converters isn’t a new repair. What’s new is the expanded procedure and the requirement to obtain corporate authorization before completing the warranty replacement.
We also discuss GM’s diesel 10-speed transmission issues, the software used to monitor valve-body wear and the expected move away from the eight-speed transmission in the 2027 Silverado and Sierra 1500.
Read the complete story:
https://pickuptrucktalk.com/2026/08/gm-mandates-new-8-speed-transmission-repair-procedure-dealers-must-ask-permission/
Has your Silverado, Sierra, Colorado or Canyon experienced transmission shudder? Did changing the fluid fix it, or did your truck need a new torque converter? Let us know in the comments.
#ChevySilverado #GMCSierra #ChevyColorado #GMCCanyon #TransmissionProblems #GMTrucks
Chapters
0:00 GM’s New 8-Speed Transmission Procedure
1:11 Affected Silverado, Sierra, Colorado and Canyon Models
2:21 What Happens When the Fluid Change Doesn’t Work
3:05 Seventh-Gear Test and Torque Converter Replacement
3:38 Dealers Must Get GM’s Permission
3:58 Why GM Added Another Approval Step
5:02 What Owners Need to Know
5:59 GM’s Diesel 10-Speed Transmission Problems
6:33 The 8-Speed Is Going Away for 2027
7:09 Final Thoughts
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