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Service bulletin 21-NA-169

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 id11000363
Published by NHTSA2024-05-24
Manufacturer's number21-NA-169
Manufacturer's date2024-05-03
NHTSA componentPOWER TRAIN; ELECTRICAL SYSTEM

NHTSA's summary

This service bulletin provides diagnostic information/procedures to aid the service technician in diagnosing 9T45/50/60 automatic transmissions with low mileage and DTCs current or history related to the control solenoids and valves.

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

Electrical system, Transmission and driveline

Vehicles listed
BUICK ENCORE GX2021, 2022, 2023, 2024
BUICK ENVISION2021, 2022, 2023, 2024
CADILLAC XT42021, 2022, 2023, 2024
CADILLAC XT52021, 2022, 2023, 2024
CADILLAC XT62021, 2022, 2023, 2024
CHEVROLET BLAZER2021, 2022, 2023, 2024
CHEVROLET MALIBU2021, 2022, 2023
CHEVROLET TRAILBLAZER2021, 2022, 2023, 2024
GMC ACADIA2021, 2022, 2023, 2024
GMC TERRAIN2021, 2022, 2023, 2024

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

Recalls for the same vehicles and component
24V4590002024-06-20. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
24V3200002024-05-09. ELECTRICAL SYSTEM:PROPULSION SYSTEM; ELECTRICAL SYSTEM:WIRING
23V7440002023-11-06. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
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
21V4210002021-06-10. AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT; ELECTRICAL SYSTEM:SOFTWARE

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.
N242468490-022026-05-28. Service campaign. Certain vehicles may have missing cavity plugs from the rear chassis harness electrical connector. Dealers are to inspect the rear chassis harness and replace missing harness plugs as necessary.
PIE0831A2026-03-31. Service bulletin. This engineering information (EI) closure ends the need for gathering further information from technicians in regard to the Malfunction Indicator Lamp (MIL) illuminated on Driver Information Center (DIC), DTC P0299 Set.
24-NA-1662025-12-02. Service bulletin. This technical bulletin provides repair information to correct a customer concern of DTC C1171 C1172 C1173 C1174 Tire Pressure Monitor Sensor Unable to Relearn Ethernet Cable Overlay for TCP OnStar Module.
25-NA-1192025-10-27. Service bulletin. This service bulletin provides information on the Service Safety Restraint Message displayed on the DIC Airbag malfunction indicator illuminated.
25-NA-0442025-10-27. Service bulletin. This service bulletin provides information for dealers/technicians on SPS2 Hybrid/EV Battery Data Retrieval for Service High Voltage DTCs.
24-NA-2022025-10-27. Service bulletin. This service bulletin provides dealers with Warranty Administration information on North American Charging Standard (NACS) DC Adapter Warranty Claim Information.
25-NA-2492025-10-21. Service bulletin. This service bulletin provides the correction to the condition of the Malfunction Indicator Lamp being illuminated and/or the DTC P149E set.