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Service bulletin 21NA181

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10207910
Published by NHTSA2022-02-14
Manufacturer's number21NA181
Manufacturer's date2021-12-21
NHTSA componentPOWER TRAIN

NHTSA's summary

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

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Transmission and driveline

Vehicles listed
BUICK ENCORE GX2020, 2021, 2022
BUICK ENVISION2021, 2022
CADILLAC XT42019, 2020, 2021, 2022
CADILLAC XT52020, 2021, 2022
CADILLAC XT62020, 2021, 2022
CHEVROLET BLAZER2020, 2021, 2022
GMC ACADIA2020, 2021, 2022
GMC TERRAIN2018, 2019, 2020, 2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
23V1720002023-03-16. POWER TRAIN:AUTOMATIC TRANSMISSION
20205202020-10-29. Powertrain
20V6680002020-10-29. POWER TRAIN:AUTOMATIC TRANSMISSION
17V5160002017-08-22. POWER TRAIN:DRIVELINE:DRIVESHAFT

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
23-NA-1192025-10-16. Service bulletin. This service bulletin provides service procedure information to correct a customer concern of Shift to Park Displayed on DIC When Vehicle is in- Park, No Start - DTC B000A Set.
PI0281L2025-06-12. Service bulletin. This preliminary informational (PI) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
19-NA-2002025-04-10. Service bulletin. This service bulletin provides a repair procedure to correct a customer concern of start/stop inoperative, MIL illuminated w/DTC P2797.
PIP6036A2025-04-07. Service bulletin. This Preliminary information communicates diagnostic aids for a surge or fishbite concern
PIP5975A2025-03-02. Service bulletin. This Preliminary information communicates information on what dealer technicians should due if they encounter a broken chain on a CVT transmission
PIP6032A2025-02-03. Service bulletin. This Preliminary Information communication advises the technician on possible sources of transmission fluid leaks from the transmission oil filter or cooler line seals .
21-NA-2932025-01-30. Service bulletin. This technical bulletin provides repair information to correct a customer concern of Poor Engine Performance in Extremely Cold Weather Conditions, Charge Air Cooler Icing - Malfunction Indicator Lamp (MIL) Illuminated, DTC P0299, P0234, P0236, P00C7 Set.
09-06-04-026Z2025-01-23. Service bulletin. This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
PIP60362025-01-20. Service bulletin. This Preliminary information communicates diagnostic aids for a surge or fishbite concern
08-07-30-035I2024-12-19. Service bulletin. This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid.