GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4993
URGENT - DISTRIBUTE IMMEDIATELY
Date:

March 08, 2019

Subject: N192212090 - Service Update
Rear Bumper Corrosion
Models: 2019 Chevrolet Silverado 1500 (New Model)
2019 GMC Sierra 1500 (New Model)
To:

All General Motors Dealers

General Motors is releasing Service Update N192212090 today. The total
number of U.S. vehicles involved is approximately 32,255. Please see the
attached bulletin for details.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated March
08, 2019. A list of involved vehicles in dealer new inventory is attached to this
message. Please hold all warranty transactions until IVH has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Service Update
N192212090 Rear Bumper Corrosion
Release Date:
Attention:

March 2019

Revision:

00

This service update involves vehicles in dealer inventory only and will expire March 31, 2020.

Make
Chevrolet
GMC

Model
Silverado 1500 (New Model)
Sierra 1500 (New Model)

Model Year
From
To
2019
2019

RPO

Description

This service update should be performed on vehicles in dealer inventory only. Involved vehicles are marked “open” on
the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked
to confirm vehicle involvement prior to beginning any required inspections and/or repairs.
Condition

Correction

Certain 2019 model year Chevrolet Silverado and GMC Sierra 1500 (New Model) vehicles may have
rear bumper flanges that were manually bent after chrome plating. This bending could cause microcracking of the chrome plating and ultimately result in red rust forming on the base steel bumper.
Dealers are to inspect for rust with step pad in place and apply wax if no rust is present. If rust is present
with step pad in place, replace the chrome bumper.

Parts
IMPORTANT: One can of Cavity Pro Wax will service approximately 150 vehicles. There is a limited supply of this product,
order one can per dealer. This material will be shipped to the dealer free of charge.
Quantity
1
1
1
1
As
Required

Part Name

Part No.
84564755
84564756
84564757
84564758
NPN*

Bar-Rear Bumper Impact
Bar-Rear Bumper Impact
Bar-Rear Bumper Impact
Bar-Rear Bumper Impact
SWT Cavity Pro 300 Wax

* Contact www.waxbulletin.com to order one container of the product used in this procedure. If additional material ordering
support is required, please call 586-530-5591. Do not order from GMCCA.
Note: Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which rear bumper impact bar to order.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation
9104331
9104332

Description
Install Corrosion Preventative Material
Replace Rear Bumper
ADD: Replace Rear Park Assist Brackets as Required, Includes
Paint to Match, Mix and Clean

Labor
Time
0.7
1.7
0.9

Trans.
Type
ZFAT
ZFAT

Net
Item
N/A
GC*

* Use material allowance code GC.

Copyright 2019 General Motors. All Rights Reserved.

Page 1 of 4

Service Update
N192212090 Rear Bumper Corrosion
Service Procedure

5246957

1.

If required, use a damp towel to clean the left and right bumper ends. Ensure the area around the step pocket is clean
and dry.

2.

Inspect the areas around the left and right step pockets for any sign of rust.

5246968

•

If any rust is seen, replace the rear bumper impact bar. Refer to Rear Bumper Impact Bar Replacement in
SI.

•

If no rust is seen, proceed to step #3.

NOTE: Ensure the bumper surface is at or near room temperature, 32-120 deg. F (0-49 deg. C) before proceeding with
step #3.
3.

Remove the left and right rear bumper step pads. Refer to Rear Bumper Step Pad Replacement in SI.

Page 2 of 4

Service Update
N192212090 Rear Bumper Corrosion

5246999

4.

If any rust is found on the rear bumper impact bar under the step pad assembly, use warm water and car wash
detergent to remove the rust. Rinse thoroughly and dry.

5246975

5.

Using a bristle type paint brush, apply one even coat of the wax on the left and right side of the rear bumper as shown.

5247009

6.

Reinstall the left and right step pads. Refer to Rear Bumper Step Pad Replacement in SI.

Page 3 of 4

Service Update
N192212090 Rear Bumper Corrosion

5247016

7.

Using a clean dry paper towel, remove the excess wax that shows on the exposed chrome areas of the bumper. Do
not use any cleaners or solvents. Repeat this step until the wax is no longer visible.

NOTE: There may be a small amount of residual wax directly around the edge of the step pad, this is acceptable. Do not
attempt to remove any of the wax from under the step pad.
Dealer Responsibility
Dealers must take the steps necessary to ensure that the service update correction has been made to all involved vehicles
in dealer inventory before selling or dealer-trading the vehicle, but no later than March 31, 2020.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers
take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded,
released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.

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 tools, equipment, 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 dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

Page 4 of 4