# Service bulletin 20NA165

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: 10181697
- Published by NHTSA: 2020\-10\-26
- Manufacturer's number: 20NA165
- Manufacturer's date: 2020\-09\-08
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE; STRUCTURE:BODY; ENGINE

## NHTSA's summary

This technical bulletin provides repair information to correct a customer concern of Flutter or Boom Noise at 1200 RPM\- Service Calibration.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181697-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181697-9999.pdf)

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

## Components

Body and frame, Electrical system, Engine, Software

## Vehicles listed

- 2021 BUICK ENCORE GX
- 2021 CHEVROLET TRAILBLAZER

## Other bulletins for the same vehicles and component

- [20\-NA\-132](/bulletins/10252774.md), 2024-04-05, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
- [PIP5632G](/bulletins/10230683.md), 2023-01-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
- [PIP4902Q](/bulletins/10230682.md), 2023-01-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to send the session logs to General Motors Technical Assistance Center for further assistance on the vehicle in question.
- [21NA256](/bulletins/10207916.md), 2022-02-14, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); EXTERIOR LIGHTING. This service bulletin provides repair information for dealers/technicians to correct a customer concern of a Malfunction Indicator Lamp Illuminated with DTC P26BB Set.
- [21NA145](/bulletins/10200144.md), 2021-08-09, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. This service bulletin provides U157 software update information to correct customer concerns of radio Software related issues.
- [20NA237](/bulletins/10187429.md), 2021-02-22, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. This service bulletin provides V152 radio software update information to correct customer concerns of various software issues.
- [20NA237](/bulletins/10186102.md), 2021-02-01, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; EQUIPMENT. This service bulletin provides V152 radio software update information to correct customer concerns of various software issues.
- [16NA019](/bulletins/10186058.md), 2021-02-01, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
- [PIP5746](/bulletins/10179653.md), 2020-09-14, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. This Preliminary information communicates the possibility of the vehicle having dtc P2B95 in history and possibly P2B96 P2B0A, P2B08, or P2B09 due to a software anomally.
- [A202301230](/bulletins/10176817.md), 2020-06-29, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE; ENGINE. SUB \- Certain 2021 model year Chevrolet Trailblazer, and 2020\-2021 model year Buick Encore GX vehicles, equipped with a continuously variable ratio \(CVT\) transmission, may experience reduced launch performance during a quick exit from a stop/start event. DTC?s P0746 and P0776 may also set illuminating a Check Engine Light. The main pump in the CVT has a priming delay under certain conditions. Dealers will reprogram the transmission control module \(TCM\) with updated software.

JSON: [/v1/bulletins/10181697](/v1/bulletins/10181697)

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