# Service bulletin 21\-NA\-166

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: 10242936
- Published by NHTSA: 2023\-09\-29
- Manufacturer's number: 21\-NA\-166
- Manufacturer's date: 2023\-09\-05
- NHTSA component: ELECTRICAL SYSTEM; EXTERIOR LIGHTING:TURN SIGNAL; EQUIPMENT

## NHTSA's summary

This informational bulletin provides information on the turn signal stalk not cancelling and/or mis cancelling.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10242936-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10242936-9999.pdf)

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

## Components

Electrical system, Equipment and accessories, Lighting, Turn signals

## Vehicles listed

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

## Other bulletins for the same vehicles and component

- [23\-NA\-132](/bulletins/10244282.md), 2023-10-25, Service bulletin: EXTERIOR LIGHTING; EXTERIOR LIGHTING:TURN SIGNAL. This service bulletin provides repair information to correct a customer concern of Turn Signals and/or Daytime Running Lights Intermittently Inoperable.
- [N222357790](/bulletins/10209060.md), 2022-03-15, Service bulletin: EXTERIOR LIGHTING:TURN SIGNAL:SWITCH; LANE DEPARTURE. Customer Satisfaction Program. Certain vehicles may have been built with the incorrect turn signal switch installed. Dealers are to inspect, and if necessary, replace the turn signal switch.
- [PIE0625A](/bulletins/10200163.md), 2021-08-09, Service bulletin: EXTERIOR LIGHTING:TURN SIGNAL. This engineering information \(EI\) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards on a turn signal not canceling and/or mis\-canceling.
- [PIE0625](/bulletins/10191253.md), 2021-05-03, Service bulletin: EXTERIOR LIGHTING:TURN SIGNAL:SWITCH. This engineering information \(EI\) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards on a turn signal not canceling and/or mis\-canceling.

JSON: [/v1/bulletins/10242936](/v1/bulletins/10242936)

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