21NA137

Service Bulletin
Bulletin No.:
21-NA-137
Date:
June, 2021
INFORMATION
Subject:
Information on Headlamp Beam Shadow Appearance and/or Driver Side to Passenger
Side Beam Appears Unlevel
Brand:
Model:
Cadillac
CT4
Model Year:
VIN:
from
to
from
to
2020
2021
—
—
Engine:
Transmission:
All
All
Involved Region or Country
North America, Europe, Middle East, Cadillac Korea (South Korea), China
Condition
Some customers may comment on seeing a headlamp beam shadow appearance and/or
the driver side beam may appear lower than the passenger side beam.
Copyright 2021 General Motors LLC. All Rights Reserved.
Page 2
June, 2021
Bulletin No.: 21-NA-137
5844384
Cause
5844385
The cause of the condition may be that the shadow is the result of a design notch, which
is NOT a defect, but a design intent to reduce distraction of oncoming traffic.
Note: If the customer concern appears the same as shown in the graphic examples
above, this condition does NOT require adjustment or replacement of the lamp.
Correction
Please communicate to the customer that the headlamp system is functioning as
designed and this is a normal condition of their vehicle. Please share this information with
the customer, including a copy of this bulletin.
Parts Information
No parts are required for this repair.
Version
1
Modified
Released June 14, 2021
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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