# Service bulletin 23\-NA\-185

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: 11017255
- Published by NHTSA: 2025\-04\-28
- Manufacturer's number: 23\-NA\-185
- Manufacturer's date: 2025\-03\-25
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM; STEERING

## NHTSA's summary

This service bulletin helps diagnose/reduce possible CCND issues on Transfer Cases \- Service 4WD on DIC, Intermittent Failures, Noise Concerns, Driveline/Steering Vibration/Shudder, Intermittent DTCs/MIL Illuminated, Engagement/Disengagement/Ratcheting Concerns.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017255-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017255-9999.pdf)

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

## Components

Electrical system, Steering, Transmission and driveline

## Vehicles listed

- 2020 to 2025 CADILLAC ESCALADE
- 2020 to 2025 CADILLAC ESCALADE ESV
- 2023 to 2025 CHEVROLET COLORADO
- 2019 to 2025 CHEVROLET SILVERADO 1500
- 2020 to 2025 CHEVROLET SILVERADO 2500
- 2020 to 2025 CHEVROLET SILVERADO 3500
- 2020 to 2024 CHEVROLET SUBURBAN
- 2021 to 2025 CHEVROLET SUBURBAN 1500
- 2020 to 2025 CHEVROLET TAHOE
- 2023 to 2025 GMC CANYON
- 2019 to 2025 GMC SIERRA 1500
- 2020 to 2025 GMC SIERRA 2500
- 2020 to 2025 GMC SIERRA 3500
- 2020 to 2025 GMC YUKON
- 2020 to 2025 GMC YUKON XL
- 2023 GMC YUKON XL 1500

## Recalls for the same vehicles and component

- [26V289000](/recalls/nhtsa/26V289000.md), 2026-05-07: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)
- [26V085000](/recalls/nhtsa/26V085000.md), 2026-02-13: POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE
- [2026061](/recalls/tc/2026061.md), 2026-02-12: Powertrain
- [2026060](/recalls/tc/2026060.md), 2026-02-12: Powertrain
- [26V083000](/recalls/nhtsa/26V083000.md), 2026-02-12: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY
- [24V937000](/recalls/nhtsa/24V937000.md), 2024-12-18: FORWARD COLLISION AVOIDANCE: WARNINGS:EXTERNAL/PEDESTRIAN ALERT; ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM
- [2024637](/recalls/tc/2024637.md), 2024-10-24: Powertrain
- [24V797000](/recalls/nhtsa/24V797000.md), 2024-10-24: POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE
- [24V320000](/recalls/nhtsa/24V320000.md), 2024-05-09: ELECTRICAL SYSTEM:PROPULSION SYSTEM; ELECTRICAL SYSTEM:WIRING
- [24V133000](/recalls/nhtsa/24V133000.md), 2024-02-22: ELECTRICAL SYSTEM:ADAS:DRIVER MONITORING:CAMERA/SENSOR; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

## 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.
- [N252529080](/bulletins/11030439.md), 2026-04-01, Service campaign: ELECTRICAL SYSTEM. Service Update. Certain vehicles listed above may be missing a high voltage header plug on the RESS battery pack drive motor connector. Dealers are to inspect the RESS pack connectors and install the proper HV Header Plug if missing.
- [N252515590](/bulletins/11027795.md), 2026-01-27, Service campaign: ELECTRICAL SYSTEM. Certain vehicles listed above, may have a condition in which the body\-to\-chassis ground strap may be corroded. Dealers will replace the ground strap.
- [25\-NA\-080](/bulletins/11026044.md), 2025-12-03, Service bulletin: POWER TRAIN. This service bulletin provides a procedure to overhaul the control valve to replace a plate and worn down check ball to correct the customers concern of No Reverse, No Shift Past Third Gear \- DTC P2732 Set.
- [25\-NA\-021](/bulletins/11026043.md), 2025-12-03, Service bulletin: ELECTRICAL SYSTEM. This technical bulletin provides repair information to correct a customer concern of Radio Software Update W23E\-178.1.2\-M174\-SQBR6\-93.3.
- [24\-NA\-262](/bulletins/11026024.md), 2025-12-03, Service bulletin: POWER TRAIN. This bulletin helps aid the tech in possible 10L100 transmission noise that may be normal or abnormal depending on the concern noted.
- [N252528020](/bulletins/11025604.md), 2025-11-18, Service campaign: STEERING. Certain vehicles may have a condition in which the Upper Intermediate Steering Shaft Bolt is below torque specification. Dealers will torque the Upper Intermediate Steering Shaft Bolt to specification.
- [25\-NA\-121](/bulletins/11024501.md), 2025-10-27, Service bulletin: ELECTRICAL SYSTEM. This service bulletin provides information on the radio software related issues to update the radio to the latest software version Y177.
- [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\-108](/bulletins/11024499.md), 2025-10-27, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides a procedure to inspect and verify the drive shafts are over extending past the 5mm tolerance, causing the customers concern of a fluid leak under the vehicle.

JSON: [/v1/bulletins/11017255](/v1/bulletins/11017255)

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