Bulletin No.: 24-NA-005

Service Bulletin

Date: July, 2024

TECHNICAL
Subject:

Brand:

Headlamps Flashing and/or DTC P0606 Set in Lighting Control Module

Model:

Model Year:
from

to

Chevrolet

Silverado 2500HD/
3500HD

2024

2024

GMC

Sierra 2500HD/
3500HD

2024

2024

VIN:
from

to

—

—

Engine:

Transmission:

—

—

Involved Region or Country

North America, Middle East, Israel, Australia/New Zealand

Condition

Some customers may comment on the headlamps flashing and/or the windshield wiper
pausing while wiping.
Technicians may find DTC P0606 in the Lighting Control Module set current or in recent
history.

Cause

The causes of the condition may be that a low battery state of charge can cause voltage
diagnostics to fail in the Lighting Control Module.
If the battery goes below the threshold in the Lighting Control Module during a cranking
event or battery discharged that needs a jump start, the Lighting Control Module may go
into a reset every 8-10 seconds, causing the headlamps to flash.

Correction

DO NOT replace the Lighting Control Module for this condition.
A new calibration has been released for the Lighting Control Module.
Reprogram the Lighting Control Module with the updated software.

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.
Caution: Before downloading the update files, be sure
the computer is connected to the internet through a
network cable (hardwired). DO NOT DOWNLOAD or
install the files wirelessly. If there is an interruption
during programming, programming failure or control
module damage may occur.
• Ensure the programming tool is equipped with the
latest software and is securely connected to the
data link connector. If there is an interruption
during programming, programming failure or
control module damage may occur.

Copyright 2024 General Motors. All Rights Reserved.

• Stable battery voltage is critical during
programming. Any fluctuation, spiking,
over voltage or loss of voltage will interrupt
programming. Install a GM Authorized
Programming Support Tool to maintain
system voltage. Refer to www.gmdesolutions.com
for further information. If not available, connect a
fully charged 12V jumper or booster pack disconnected from the AC voltage supply. DO NOT
connect a battery charger.
• Follow the on-screen prompts regarding ignition
power mode, but ensure that anything that drains
excessive power (exterior lights, HVAC blower
motor, etc) is off.
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Important: The service technician always needs to
verify that the VIN displayed in the TLC left side drop
down menu and the top center window match the VIN
plate of the vehicle to be programmed prior to using
Service Programming System 2 (SPS2) for
programming or reprogramming a module.

Page 2

July, 2024

• For the TLC application, service technicians need
to always ensure that the power mode (ignition) is
“ON” before reading the VIN from the vehicle’s VIN
master module and that they do not select a VIN
that is already in the TLC application memory from
a previous vehicle.
• If the VIN that shows up in the TLC top center
window after correctly reading the VIN from the
vehicle does not match the VIN plate of the
vehicle, manually type in the VIN characters from
the vehicle VIN plate into the TLC top center
window and use these for programming or reprogramming the subject module with the correct
vehicle VIN and software and/or calibrations.
• The Engine Control Module (ECM) is the master
module (for VIP vehicles) that TLC reads to

Bulletin No.: 24-NA-005
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the ECM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.

• The Body Control Module (BCM) is the master
module (for GEM vehicles) that TLC reads to
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the BCM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.
Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.

5743643

Important: If the vehicle VIN DOES NOT match, the
message below will be shown.

Bulletin No.: 24-NA-005

July, 2024

Page 3

5877000

5644477

Important: Techline Connect screen shown above.
Important: If the same calibration/software warning is
noted on the TLC Summary screen, select OK and
follow screen instructions. After a successful
programming event, the WCC is located in the Service
Programming System dialogue box of the SPS
Summary screen. Record the WCC on the job card. No

further action is required. Refer to the Warranty Information section of this bulletin.
1. Reprogram the Lighting Control Module. Refer to
K219 Lighting Control Module: Programming and
Setup.

Page 4

July, 2024

Bulletin No.: 24-NA-005

5644478

Note: The screenshot above is an example of module
programming and may not be indicative of the specific
module that is being programmed. Module selection
and VIN information have been blacked out.
Important: To avoid warranty transaction rejections,
you MUST record the warranty claim code provided on
the Warranty Claim Code (WCC) screen shown above
on the job card. Refer to callout 1 above for the location
of the WCC on the screen.

2. Record the SPS Warranty Claim Code on the job
card for warranty transaction submission.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

2811105*

K219 Lighting Control Module Reprogramming with SPS

Use Published Labor Operation Time

Important: *To avoid warranty transaction rejections, carefully read and follow the instructions below:

Bulletin No.: 24-NA-005

July, 2024

Labor Operation

Description

Page 5
Labor Time

6125814

• The Warranty Claim Code must be accurately entered in the “Warranty Claim Code” field of the transaction.
• When more than one Warranty Claim Code is generated for a programming event, it is required to document all Warranty
Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the “Warranty Claim
Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided by
SPS2.

Warranty Claim Code Information Retrieval

6125774

Page 6

July, 2024

If the Warranty Claim Code was not recorded on the
Job Card, the code can be retrieved in the SPS2
system as follows:
1. Open TLC on the computer used to program the
vehicle.
2. Select and start SPS2.

Bulletin No.: 24-NA-005

4. Select the Warranty Claim Code tab (2).
The VIN, Warranty Claim Code and Date/Time will be
listed on a roster of recent programming events. If the
code is retrievable, dealers should resubmit the transaction making sure to include the code in the SPS
Warranty Claim Code field.

3. Select Settings (1).
Version

2

Modified

Released January 10, 2024
Revised July 16, 2024 – Revised Correction and Service Procedure with programming
instructions and revised Warranty Information with SI Labor Operation.

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