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Service bulletin 23-NA-021

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 id10245570
Published by NHTSA2023-11-29
Manufacturer's number23-NA-021
Manufacturer's date2023-11-16
NHTSA componentPOWER TRAIN; ELECTRICAL SYSTEM

NHTSA's summary

This service bulletin advises the tech that the rotational Clicking Noise Heard After Engine Shut Down may be normal characteristics of the vehicle.

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 ENCLAVE2018, 2019, 2020, 2021, 2022, 2023, 2024
BUICK ENCORE GX2020, 2021, 2022, 2023, 2024
BUICK ENVISION2018, 2019, 2020, 2021, 2022, 2023, 2024
BUICK LACROSSE2018, 2019
BUICK REGAL2018, 2019, 2020
CADILLAC XT42019, 2020, 2021, 2022, 2023, 2024
CADILLAC XT52020, 2021, 2022, 2023, 2024
CADILLAC XT62020, 2021, 2022, 2023, 2024
CHEVROLET BLAZER2019, 2020, 2021, 2022, 2023, 2024
CHEVROLET CRUZE2017, 2018, 2019
CHEVROLET EQUINOX2018, 2019, 2020
CHEVROLET MALIBU2017, 2018, 2019, 2020, 2021, 2022
CHEVROLET TRAILBLAZER2021, 2022, 2023, 2024
CHEVROLET TRAVERSE2018, 2019, 2020, 2021, 2022, 2023
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
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
21V8170002021-10-18. POWER TRAIN:AUTOMATIC TRANSMISSION
21V4210002021-06-10. AIR BAGS:SRS MALFUNCTION WARNING LAMP/LIGHT; ELECTRICAL SYSTEM:SOFTWARE
20205202020-10-29. Powertrain

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.
22-NA-0072025-11-15. Service bulletin. This service bulletin provides procedures to correct customer concerns of Poor Engine Performance in Extremely Cold Weather Conditions, Charge Air Cooler (CAC) Icing - Malfunction Indicator Lamp (MIL) Illuminated with DTCs P0299, P0234, P0236, P2227, P00C7 Set.
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.