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NHTSA ID Number: 10187391
Manufacturer Communication Number: 20NA030
Summary
This service bulletin provides a procedure to correct a customer concern of Rear Air Suspension Inoperative.
1 Affected Product
Vehicle
| MAKE | MODEL | YEAR |
| CHEVROLET | SILVERADO 4500HD | 2019 |
Parts Information
| Causal Part | Description | Part Number | Qty |
| X | SPRING, RR AIR | 19407642 | 2 |
| N/A | ABSORBER, RR SHK | 19408176 | 2 |
|
|
SEOCONTENT-START
Service Bulletin Bulletin No.: 20-NA-030
Date: December, 2020
TECHNICAL
Subject: Rear Air Suspension Inoperative
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet Silverado 4500HD,
5500HD and 6500HD 2019 2020
Involved Region or Country North America
Additional Options (RPOs)
G40 (SUSPENSION REAR-12,000 LB, AIR)
GP1 (SUSPENSION REAR-13,500 LB, AIR)
GP8 (SUSPENSION REAR-15,500 LB, AIR)
Condition Some customers may comment that the rear of the truck sits low, or air suspension will
not properly inflate.
Cause This condition may be caused by the rear air spring coming off the lower mount when
lifting/removing weight off rear axle.
Correction If it has been verified that the rear air spring has come off the rear mount, replace both
rear air springs and the shock absorbers.
Service Procedure
Refer to Air Spring Replacement in SI.
Refer to Rear Shock Absorber Replacement (With Air
Springs) in SI.
Parts Information
Causal
Part
Description Part
Number
Qty
X SPRING, RR AIR 19407642 2
N/A ABSORBER,
RR SHK
19408176 2
Page 2 December, 2020 Bulletin No.: 20-NA-030
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
8000021 Rear Air Spring Replacement – Both Sides Use the Published Labor
8044751 Rear Shock Absorber Replacement – Both Sides Operations Time
Version 1
Modified Released November 30, 2020
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: 20-NA-030
Date: December, 2020
MC-10187391-9999.pdf 497.683KB
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