NHTSA ID Number: 11017255
Manufacturer Communication Number: 23-NA-185
TSB/Document Date: 2025-04-28
Summary
This service bulletin helps diagnose/reduce possible CCND issues on Transfer Cases - Service 4WD on DIC, Intermittent Failures, Noise Concerns, Driveline/Steering Vibration/Shudder, Intermittent DTCs/MIL Illuminated, Engagement/Disengagement/Ratcheting Concerns.
Bulletin No.: 23-NA-185
Service Bulletin
Date: March, 2025
INFORMATION
Subject:
Brand:
Information on Helping Reduce Customer Concern Not Duplicated (CCND) on
Transfer Cases - Service 4WD on Driver Information Center (DIC), Intermittent
Failures, Noise Concerns, Drivers Driveline/Steering Vibration/Shudder,
Intermittent DTCs/Malfunction Indicator Lamp (MIL) Illuminated, Engagement/
Disengagement/Ratcheting Concerns
Model:
Model Year:
from
2020
2025
Colorado
2023
2025
Silverado LD
2019
2019
Silverado 1500
(New Model)
2019
2021
2022
2022
Silverado 1500 New
(RPO J22, 12th VIN
Digit = 5 or greater)
Silverado 1500
2023
Silverado 2500HD/
3500HD
2020
Suburban
2025
Canyon
2023
2025
Sierra Limited
2019
2019
Sierra 1500 (New
Model)
2019
2021
2022
2022
Sierra 1500 Limited
(RPO J21, 12th VIN
Digit = 4 or less)
Sierra 1500 New
(RPO J22, 12th VIN
Digit = 5 or greater)
Sierra 1500
2023
Sierra 2500/HD/
3500HD
2020
Yukon Models
2020
Copyright 2025 General Motors
. All Rights Reserved.
from
to
—
—
Transmissi
on:
—
—
2025
2020
Tahoe
to
Escalade
Silverado 1500 LTD
(RPO J21, 12th VIN
Digit = 4 or less)
Chevrolet
VIN:
2025
2025
Page 2
March, 2025
Bulletin No.: 23-NA-185
Involved Region or Country
North America, Colombia, Chile, Ecuador, Paraguay, Peru, Uruguay, Middle East,
Europe, Israel, Palestine, Japan, Thailand, Uzbekistan, Russia, GM Korea Company,
South Korea
Additional RPO
NP0 (TRANSFER CASE-ACTIVE, SINGLE SPEED, SWITCH ACTIVATED, ALUM)
NQF (TRANSFER CASE-ELECTRIC SHIFT CONT, TWO SPEED, ALUM)
NQG (TRANSFER CASE-MANUAL SHIFT CONT, TWO SPEED, ALUM)
NQH (TRANSFER CASE-ACTIVE, TWO SPEED, SWITCH ACTIVATED, ALUM)
Some customers may comment on one or more of the following conditions:
• Service 4WD on the DIC
• MIL illuminated
Condition
• Intermittent Failures
• Noise Concerns
• Drivers Driveline/Steering Vibration/Shudder
• Intermittent DTC’s
• Engagement/Disengagement/Ratcheting Concerns
Cause
This condition may be caused by several possible causes.
Information
The flow chart below is intended to help better diagnose the vehicle and eliminate the
chances of another visit by the customer.
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.
Service Procedure
Diagnosing CCND Issues
1. Can you duplicate the complaint?
Yes
Refer to SI for the concern.
NO, move onto 2
2. Is the problem noise related?
Yes
Refer TSB 19-NA-136.
NO, move onto 3
3. Is the issue present only on 4HI or
4LO (if equipped)?
Yes
Refer to Four-Wheel Drive in Owner’s
Manual.
NO, move onto 4
4. Are there any current DTCs on the
scan tool?
Yes
Refer to SI for the concern DTC.
NO, move onto 5
5. Refer to scan tool for DTC history
display.
Yes
Use Freeze Frame Failure Records on the
scan tool to find DTCs that are stored in
the history of the module.
NO, move onto 6
6. Perform a thorough visual inspection
of the area of the vehicle related to the
customer concern.
Yes
Replace any damaged part.
NO, move onto 7
7. Could the issue be intermittent?
Yes
Refer to TSB 22-NA-187.
NO, move onto 8
8. Verify that the TCCM has the latest
calibration through SPS2.
No
Follow instructions on SPS2 programming
tool.
Additional information for steps above:
1. The issue reported by the customer might/might not be duplicated by the technician during the visit.
Bulletin No.: 23-NA-185
March, 2025
Page 3
2. Some issues in the transfer case might be able to be duplicated and can also be eliminated with the drain and
fill referred on the TSB. Refer to the Symptoms –Transfer Case document in SI for more information on
diagnosing noise related concerns.
3. The condition could be normal. Refer to the Owner Manual, Driving and Operating, Drive Systems, Four-Wheel
Drive. When the front driveline is engaged/functioning, additional components start moving and that can
increase the noise levels heard in the cabin of the vehicle. If possible, compare to a similarly equipped with
similar mileage known good vehicle.
4. Some issues might be related to DTCs that trigger the Service 4WD warning on the dashboard. If that is the
case, review the specific SI information pertaining to the DTC to resolve the issue.
5. Check scan tool for DTCs that could have cleared after 40 ignition cycles. This could have caused the
customer’s concern if the service 4WD light is not on anymore. The Freeze Frame Failure Records screen can
be found navigating through the following:
⇒
Module diagnostics
⇒
TCCM
⇒
Diagnostic Trouble Codes
⇒
Freeze Frame Failure Records
− In most of the cases, DTCs starting with a “C” are the cause of a Service 4WD light on the cluster/dashboard.
6. Check the surroundings of the transfer case for damage in the components that interact with it, check for cut
wires, confirm proper terminal tension in the transfer case terminal connector.
7. In some instances, the issue could be related to intermittences coming from the harness. Follow the TSB for
more detail on components to check.
8. Make sure the vehicle has the latest software/calibration installed in the TCCM. If not, reflash it with the latest
version available following the SPS2 tool directions.
Warranty Information
Note: Only select the labor operation that coincides with the repair performed.
Note: If no problem was found after running the diagnostics listed in the bulletin, use 0542709 Transfer Case Customer Concern Not Duplicated (CCND)
for vehicles that had an electrical repair, use:
Labor
Operation
Description
Labor Time
5430902
5430840
Terminal Replacement
Use
Published
Labor
Operation
Time
Version
4
Modified
Released October 24, 2023
Revised January 04, 2024 – Added Colorado and Canyon to Models section.
Revised February 14, 2024 – Removed New Zealand/Australia from Involved Region or
Country section.
Revised March 25, 2025 – Added the 2024-2025 Model Years to applicable vehicles.
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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TSB/Document ID: 23-NA-185
Replacement Service Bulletin Number:
MFR Communication Date: 2025-03-25
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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