# Service bulletin N202321840

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: 10187228
- Published by NHTSA: 2021\-02\-16
- Manufacturer's number: N202321840
- Manufacturer's date: 2021\-01\-14
- NHTSA component: AIR BAGS; POWER TRAIN; EXTERIOR LIGHTING

## NHTSA's summary

Service Update. On certain vehicles equipped with automatic transmissions, the clutch spring retaining ring may not be fully seated. Vehicles with this condition may set DTC Code P0747 and the MIL light \(malfunction indicator light\) will illuminate. This typically occurs at low mileage. Dealers will inspect the transmission by following the procedure and if it fails, the transmission will be replaced.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187228-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187228-9999.pdf)

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

## Components

Air bags, Lighting, Transmission and driveline

## Trouble codes named

P0747

## Vehicles listed

- 2020 to 2021 CHEVROLET BLAZER
- 2020 CHEVROLET EQUINOX
- 2020 to 2021 GMC TERRAIN

## Recalls for the same vehicles and component

- [2023591](/recalls/tc/2023591.md), 2023-11-02: Lights And Instruments
- [2020520](/recalls/tc/2020520.md), 2020-10-29: Powertrain
- [20V668000](/recalls/nhtsa/20V668000.md), 2020-10-29: POWER TRAIN:AUTOMATIC TRANSMISSION
- [2020350](/recalls/tc/2020350.md), 2020-07-30: Airbag
- [20V446000](/recalls/nhtsa/20V446000.md), 2020-07-30: AIR BAGS:SIDE/WINDOW:CURTAIN:INFLATOR

## Other bulletins for the same vehicles and component

- [PI0281L](/bulletins/11019516.md), 2025-06-12, Service bulletin: STEERING; POWER TRAIN; SUSPENSION. This preliminary informational \(PI\) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
- [01\-08\-42\-001Q](/bulletins/11014170.md), 2025-02-11, Service bulletin: EXTERIOR LIGHTING. This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines.
- [09\-06\-04\-026Z](/bulletins/11013069.md), 2025-01-23, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides information on identifying Non\-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- [08\-07\-30\-035I](/bulletins/11011989.md), 2024-12-19, Service bulletin: POWER TRAIN. This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid.
- [21\-NA\-181](/bulletins/11011904.md), 2024-12-18, Service bulletin: POWER TRAIN. This service bulletin provides 9th gear operation information to respond to customers that may comment on transmission shift operation.
- [23\-NA\-021](/bulletins/11011225.md), 2024-12-04, Service bulletin: ENGINE; POWER TRAIN. This service bulletin advises the tech that the rotational Clicking Noise Heard After Engine Shut Down may be normal characteristics of the vehicle.
- [04\-06\-01\-029K](/bulletins/11011205.md), 2024-12-04, Service bulletin: POWER TRAIN; STEERING; ENGINE. This informational bulletin explains Unscheduled Supplemental Services and the importance of GM Simplified Maintenance Schedules.
- [24\-NA\-223](/bulletins/11010651.md), 2024-11-19, Service bulletin: POWER TRAIN. This service bulletin informs the technician of an alternate lift procedure that has been developed when the lift plate does not fit the top of the transmission case for 6T30, 6T35, 6T40, 6T45, and 6T50 Transmissions.
- [20\-NA\-138](/bulletins/11009756.md), 2024-11-05, Service bulletin: POWER TRAIN; ENGINE. This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and information on Submission of Warranty Transaction in Global Warranty Management.
- [23\-NA\-072](/bulletins/11009466.md), 2024-10-30, Service bulletin: POWER TRAIN. This service bulletin provides a procedure to correct a customer concern of Shudders or Shakes at Low Speeds.

JSON: [/v1/bulletins/10187228](/v1/bulletins/10187228)

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