# Service bulletin 20NA177

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: 10183194
- Published by NHTSA: 2020\-11\-30
- Manufacturer's number: 20NA177
- Manufacturer's date: 2020\-10\-23
- NHTSA component: SUSPENSION; SUSPENSION:REAR:SPRINGS:AIR SUSPENSION SYSTEM:SPRINGS/BAGS

## NHTSA's summary

This technical bulletin provides repair information to correct a customer concern of the loss of air pressure causing rear air suspension bags not to inflate.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10183194-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10183194-9999.pdf)

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

## Components

Suspension, Air suspension

## Vehicles listed

- 2019 CHEVROLET 6500
- 2019 to 2020 CHEVROLET SILVERADO 4500
- 2020 CHEVROLET SILVERADO 5500
- 2019 CHEVROLET SILVERADO 6500
- 2019 CHEVROLET duplicate SILVERADO 5500

## Other bulletins for the same vehicles and component

- [N222365910](/bulletins/10238173.md), 2023-06-27, Service bulletin: SUSPENSION:FRONT:SPRINGS:AIR SUSPENSION SYSTEM; SUSPENSION; SUSPENSION:REAR:SPRINGS:AIR SUSPENSION SYSTEM. Customer Satisfaction Program. Certain vehicles, equipped with Valve\-Air Suspension Air Release \(RPO JPZ\), were incorrectly invoiced with an Air Suspension Dump Valve and may have been built with the incorrect switch assembly. Dealers will issue a reimbursement check in the amount of $60 USD, replace the switch assembly, and disable the Air Suspension Dump Valve switch and Low Pressure indicator.

JSON: [/v1/bulletins/10183194](/v1/bulletins/10183194)

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