Information on 9TH Gear Operation – 2018-2023 Buick Cadillac Chevrolet GMC

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NHTSA ID Number: 10219391

Manufacturer Communication Number: 21-NA-181

Summary

This service bulletin provides 9th gear operation information to respond to customers that may comment on transmission shift operation.

 


Condition

Some customers may comment that the transmission doesn’t shift into 9th gear or
maintain 9th gear operation to customer expectations.

 

Information

The GM 9-speed transmission does use all 9 gears when most efficient to do so. The vehicle’s control system senses the operating conditions and chooses the correct gear to deliver optimum performance and fuel economy. The control calibration is also tailored for each vehicle application and engine type. On the highway for example, optimal fuel economy may actually be achieved in 8th gear rather than 9th gear depending on a number of factors including vehicle speed, engine load, and throttle input. 9th gear is engaged when appropriate.

Note: Replacing transmission components or complete assemblies will not change the condition. To ensure 9th gear is operating, verify 9th gear is not being commanded on a test drive. Then with GDS2, manually command 9th gear. If achieved, the vehicle system is operating correctly.

 


32 Affected Products

Vehicles

MAKE MODEL YEAR
BUICK ENCORE GX 2020-2022
BUICK ENVISION 2021-2022
CADILLAC XT4 2019-2022
CADILLAC XT5 2020-2023
CADILLAC XT6 2020-2023
CHEVROLET BLAZER 2020-2023
CHEVROLET TRAILBLAZER 2021-2022
GMC ACADIA 2020-2023
GMC TERRAIN 2018-2022

 


1 Associated Document

Manufacturer Communications

Bulletin No.: 21-NA-181
Date: September, 2022

https://www.nhtsa.gov/recalls?nhtsaId=10219391

MC-10219391-0001.pdf 70.727KB

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ACDelco GM Original Equipment 10-4107 Dexron ULV Automatic Transmission Fluid - 1 qt
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Valvoline DEXRON VI/MERCON LV (ATF) Full Synthetic Automatic Transmission Fluid 1 GA (883572-EA)
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ACDelco GM Original Equipment 10-9244 Dexron VI Full Synthetic Automatic Transmission Fluid - 1 gal
  • Backward compatible with previous DEXRON automatic transmission fluids and can be used as a much-improved replacement for older vehicles/transmissions originally using previous DEXRON fluids
  • Improved performance over previous DEXRON fluids in: friction durability, viscosity stability, aeration and foam control, and oxidation resistance.
  • Designed for anti-wear protection and shear stability
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
Bestseller No. 10
ACDelco GM Original Equipment 10-9394 Dexron VI Automatic Transmission Fluid - 1 qt
  • Backward compatible with previous DEXRON automatic transmission fluids and can be used as a much-improved replacement for older vehicles/transmissions originally using previous DEXRON fluids
  • Improved performance over previous DEXRON fluids in: friction durability, viscosity stability, aeration and foam control, and oxidation resistance
  • Potential to enable improved fuel economy and longer transmission life
  • Provides for extended drain intervals

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