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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
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- Helps enhance transmission cooling function
- Designed to protect metal surfaces from wea
- Formulated to condition gaskets
- 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.
- TRIAX ULV ATF is a 100% synthetic product designed for the late generation high-speed automatic electronically controlled transmissions found in a variety of newer vehicles
- Fully compliant with OEM requirements for applications requiring / compatible with Mercon ULV, Dexron ULV, WSS-M2C949-A or MB 2236.17, and other ULV applications in European and US cars, trucks and SUVs
- High shear and oxidation stability for uncompromised long term shifting performance; excellent load bearing capacity for heavy duty applications
- Very low pour point for outstanding performance and fuel economy during cold weather, down to -50 F
- Prevents shudder, gear wear, sticking, and vibration; maintains optimal frictional stability for the full duration of its life; exceptionally smooth shifting and efficient torque transfer, even under severe loads such a towing or hauling
- Meets the demands of high-speed automatic transmissions
- High-performance conditioners protect seals and prevent leaks
- Advanced anti-wear technology improves durability to help extended the life your transmission
- Provides better oil flow in both low and high temperatures
- Full synthetic formula with advanced additives protects against transmission breakdown better than conventional fluids
- 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. Provides consistent shift performance, even in extreme conditions.
- Formulated with full-synthetic base stocks and advanced additive technology to meet the challenging demands of automatic transmissions
- Enhanced anti-shudder protection for smooth shifting and maximum power transfer
- Developed with anti-wear technology to help improve transmission durability
- Engineered with a proprietary blend of base oils and advanced additives to provide better oil flow at low temperatures and greater film protection at higher temperatures
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Copyright 2022 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 21-NA-181 Date: September, 2022 INFORMATION Subject: Information on 9TH Gear Operation Brand: Model: Model Year: VIN: Engine: Transmission: (9-Speed from to from to Automatic) Buick Encore GX 2020 2023 — — L3T M3F Envision 2021 LSY M3G, M3H Cadillac XT4 2019 LSY M3H XT5 2020 LSY M3G XT6 Chevrolet Blazer 2020 LSY M3T Trailblazer 2021 L3T M3F GMC Acadia 2020 LSY M3G Terrain 2018 LYX M3U Involved Region or Country North America, Europe, Middle East, Israel, Cadillac Korea (South Korea), China 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. Parts Information No parts are required for this repair. Warranty Information For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation Description Labor Time 8486038* Confirm 9TH Gear Operation 0.3 hr *This is a unique Labor Operation for bulletin use only. Page 2 September, 2022 Bulletin No.: 21-NA-181 Version 4 Modified Released August 12, 2021 Revised December 21, 2021 – Added RPO M3H to Envision. Revised April 08, 2022 – Add 2022 Model Year to Terrain. Revised August 29, 2022 – Add 2023 Model Year. GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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