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Service bulletin 21-NA-181

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 id10242106
Published by NHTSA2023-09-09
Manufacturer's number21-NA-181
Manufacturer's date2023-08-08
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, 2023, 2024
BUICK ENVISION2021, 2022, 2023, 2024
CADILLAC XT42019, 2020, 2021, 2022, 2023, 2024
CADILLAC XT52020, 2021, 2022, 2023, 2024
CADILLAC XT62020, 2021, 2022, 2023, 2024
CHEVROLET BLAZER2020, 2021, 2022, 2023, 2024
CHEVROLET TRAILBLAZER2021, 2022, 2023, 2024
GMC ACADIA2020, 2021, 2022, 2023
GMC TERRAIN2018, 2019, 2020, 2021, 2022, 2023, 2024
GMC TERRAIN NA2022 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
20231422023-03-16. Powertrain
23V1720002023-03-16. POWER TRAIN:AUTOMATIC TRANSMISSION
23V0430002023-02-02. POWER TRAIN:DRIVELINE:DRIVESHAFT
23V0420002023-02-02. POWER TRAIN:DRIVELINE:DRIVESHAFT
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
N252502891-012026-08-20. Service campaign. Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will review the vehicles service history in IVH, and if necessary, replace the rear electric drive transmission module.
N252502890-012026-08-20. Service campaign. Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will review the vehicles service history in IVH, and if necessary, replace the front electric drive transmission module.
N242471460-012026-08-20. Service campaign. Certain vehicles may have been built with an Electric Drive Unit mounting bolt that is too long, causing damage to the Drive Unit case. Dealers will inspect and replace the Electrical Drive Unit if necessary.
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.
25-NA-0012025-04-14. Service bulletin. This service bulletin provides repair information to correct a customer concern of a transmission fluid leak.
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
25-NA-0012025-03-14. Service bulletin. This service bulletin provides repair information to correct a customer concern of a transmission fluid leak.
PIP5981D2025-03-02. Service bulletin. This Preliminary information communicates ordering process for the front and rear drive units are on restriction for all listed EV vehicles for engineering review.