# Service bulletin 21NA020

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: 10194093
- Published by NHTSA: 2021\-05\-24
- Manufacturer's number: 21NA020
- Manufacturer's date: 2021\-04\-07
- NHTSA component: BACK OVER PREVENTION; ELECTRICAL SYSTEM

## NHTSA's summary

This technical bulletin provides a procedure to correct a click type noise heard from the starter when cranking.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194093-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194093-9999.pdf)

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

## Components

Driver assistance, Electrical system, Backup camera

## Vehicles listed

- 2018 to 2019 CHEVROLET 3500
- 2020 CHEVROLET 3500
- 2018 to 2020 CHEVROLET 4500HD

## Other bulletins for the same vehicles and component

- [070601016G](/bulletins/10213761.md), 2022-06-13, Service bulletin: BACK OVER PREVENTION. This informational bulletin provides information on Internal Engine Noise or Damage After Oil Filter Replacement.
- [20NA197](/bulletins/10212562.md), 2022-05-31, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); BACK OVER PREVENTION; SERVICE BRAKES, HYDRAULIC. This technical bulletin provides a procedure to inspect and repair the fuel pressure sensor if found the cause of the customers concern.
- [21NA091](/bulletins/10205548.md), 2021-12-27, Service bulletin: BACK OVER PREVENTION; EQUIPMENT. This service bulletin provides information for customers/dealers/technicians on Normal Rearview Camera Display Operation \- Flashing Diamond \- Spot \- or UFO like image on Rear View Camera Display.
- [20NA188](/bulletins/10205545.md), 2021-12-27, Service bulletin: BACK OVER PREVENTION; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This technical bulletin provides repair information to correct a customer concern of Rear View Camera Image Flickers When Brake Lamps or Turn Signals are On.

JSON: [/v1/bulletins/10194093](/v1/bulletins/10194093)

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