20NA030
Service Bulletin Details
Public Details for: 20NA030
This service bulletin provides a procedure to correct a customer concern of rear air suspension inoperative.
- 2019 -
Models from 2019
2019 CHEVROLET SILVERADO 4500HD |
2019 CHEVROLET SILVERADO 5500HD |
2019 CHEVROLET SILVERADO 6500HD |
Bulletin No.: Service Bulletin Date: 20-NA-030 December, 2020 TECHNICAL Subject: Rear Air Suspension Inoperative Model Year: Brand: Model: Chevrolet Silverado 4500HD, 5500HD and 6500HD from to 2019 2020 VIN: from to Engine: Transmission: 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 Copyright 2020 General Motors LLC. All Rights Reserved. Page 2 December, 2020 Bulletin No.: 20-NA-030 Description Labor Time 8000021 Rear Air Spring Replacement - Both Sides 8044751 Rear Shock Absorber Replacement - Both Sides Use the Published Labor Operations Time Warranty Information For vehicles repaired under warranty, use: Labor Operation Version 1 Modified Released November 30, 2020 GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION