# Service bulletin 23\-NA\-135

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.

- Type: Service bulletin
- NHTSA id: 10240364
- Published by NHTSA: 2023\-08\-03
- Manufacturer's number: 23\-NA\-135
- Manufacturer's date: 2023\-07\-31
- NHTSA component: ELECTRICAL SYSTEM; POWER TRAIN

## NHTSA's summary

This informational bulletin advises the changes to some of the 9\-speed oil control changes from previous years.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10240364-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10240364-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Transmission and driveline

## Vehicles listed

- 2023 BUICK ENCLAVE
- 2024 BUICK ENVISION
- 2024 CADILLAC XT4
- 2024 CADILLAC XT5
- 2024 CADILLAC XT6
- 2024 CHEVROLET BLAZER
- 2024 CHEVROLET TRAILBLAZER
- 2023 CHEVROLET TRAVERSE
- 2024 GMC TERRAIN

## Recalls for the same vehicles and component

- [24V459000](/recalls/nhtsa/24V459000.md), 2024-06-20: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
- [24V320000](/recalls/nhtsa/24V320000.md), 2024-05-09: ELECTRICAL SYSTEM:PROPULSION SYSTEM; ELECTRICAL SYSTEM:WIRING
- [2023142](/recalls/tc/2023142.md), 2023-03-16: Powertrain
- [23V172000](/recalls/nhtsa/23V172000.md), 2023-03-16: POWER TRAIN:AUTOMATIC TRANSMISSION
- [23V042000](/recalls/nhtsa/23V042000.md), 2023-02-02: POWER TRAIN:DRIVELINE:DRIVESHAFT

## Other bulletins for the same vehicles and component

- [N252502891\-01](/bulletins/11036308.md), 2026-08-20, Service campaign: POWER TRAIN. 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\-01](/bulletins/11036307.md), 2026-08-20, Service campaign: POWER TRAIN. 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\-01](/bulletins/11036306.md), 2026-08-20, Service campaign: POWER TRAIN. 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\-02](/bulletins/11032963.md), 2026-05-28, Service campaign: ELECTRICAL SYSTEM. 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.
- [PIE0831A](/bulletins/11030340.md), 2026-03-31, Service bulletin: ELECTRICAL SYSTEM; ENGINE. 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.
- [25\-NA\-119](/bulletins/11024500.md), 2025-10-27, Service bulletin: AIR BAGS; ELECTRICAL SYSTEM. This service bulletin provides information on the Service Safety Restraint Message displayed on the DIC Airbag malfunction indicator illuminated.
- [25\-NA\-044](/bulletins/11024498.md), 2025-10-27, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This service bulletin provides information for dealers/technicians on SPS2 Hybrid/EV Battery Data Retrieval for Service High Voltage DTCs.
- [24\-NA\-202](/bulletins/11024496.md), 2025-10-27, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This service bulletin provides dealers with Warranty Administration information on North American Charging Standard \(NACS\) DC Adapter Warranty Claim Information.
- [25\-NA\-249](/bulletins/11024386.md), 2025-10-21, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This service bulletin provides the correction to the condition of the Malfunction Indicator Lamp being illuminated and/or the DTC P149E set.
- [18\-NA\-180](/bulletins/11024324.md), 2025-10-16, Service bulletin: ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM. This Warranty Administration service bulletin provides Lithium\-Ion battery Exchange Process and Transaction Submission information.

JSON: [/v1/bulletins/10240364](/v1/bulletins/10240364)

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