22-NA-219

Bulletin No.:
Service Bulletin
Date:
22-NA-219
November, 2022
INFORMATION
Subject:
Information on Turn Signal Lenses Cracking
Brand:
Model:
Chevrolet
Low Cab Forward (LCF)
3500, 4500, 4500 HD,
4500 XD, 5500 HD, 5500
XD, 6500 XD, 7500 XD
Model Year:
from
to
2016
2023
VIN:
from
to
Engine:
Transmission:
Involved Region or Country
North America
Condition
Some customers may comment that the front turn signal lenses are cracking/cracked.
Cause
These lenses are cracking from the effects of being washed with alkaline detergents.
Alkaline detergents are typically used in industrial settings and are reactive with the paint,
metals, and other materials used to make up the exterior components of General Motors
LCF (Low Cab Forward) vehicles.
Correction
It is recommending that only neutral detergents be used when washing Chevrolet LCF
vehicles.
Service Procedure
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
6181837
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
November, 2022
Bulletin No.: 22-NA-219
6181838
If alkaline detergents are used to wash a Chevrolet LCF
vehicle, it is crucial that all traces of the detergent are
rinsed away with water or wiped off as necessary.
Allowing alkaline detergent to dry on the turn signal
lenses will cause them to crack.
Refer to the Owner’s Manual guidelines for the proper
exterior maintenance of the vehicle.
Important: Ensure that all detergent is fully washed
and wiped away. Particularly in the case of strong
alkaline detergents (typically those for industrial uses),
there is a danger that hairline cracks can develop in
lighting clusters lenses if the vehicle is operated without
detergent being fully wiped away. Always read the
detergent manufacturing instructions carefully
before use.
Parts Information
No parts are required for this repair.
Version
1
Modified
Released October 31, 2022
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.
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