NHTSA ID Number: 10245244
Manufacturer Communication Number: 23-NA-185
TSB/Document Date: 2023-11-15
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.
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
- 💝【Questions? We’re Here Anytime】MK808S is a...
- 🔥🔥🔥【2026 NEWLY RELEASED BI-DIRECTIONAL...
- 【28+ MOST POPULAR RESET SERVICE FOR 150 MAKES】Autel...
- 【ALL SYSTEM DIAGNOSTICS, FACTORY-LEVEL SCANNER】The...
- 【AUT0 SCAN & AUT0V1N, 10X FASTER】How much have you spent...
- 💯【Conta.ct us for Support Directly】If you met any...
- 🔥🔥🔥【2026 AUTEL FLAGSHIP MK900BT MK900-BT, NEW...
- 🚗【3000+ ACTIVE TESTS (50➡3000+), SAME AS MS...
- 🚗【40+ HOT SERVICES FOR 150 MAKES (28+➡40+)】Full...
- 🚗【OE ALL SYSTEM DIAGNOSE, AUTO SCAN 2.0: SCAN LICENSE...
This product presentation was made with AAWP plugin.
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: 23-NA-185
Replacement Service Bulletin Number:
MFR Communication Date: 2023-10-24
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Bulletin No.:
Service Bulletin
Date:
23-NA-185
October, 2023
INFORMATION
Subject:
Information on Helping Reduce Customer Concern Not Duplicated (CCND) on Transfer
Cases - Service 4WD on the Drivers Instrument Center (DIC), Intermittent Failures,
Noise Concerns, Drivers Driveline/Steering Vibration/Shudder, Intermittent DTC’s/
Malfunction Indicator Lamp (MIL) Illuminated, Engagement/Disengagement/Ratcheting
Concerns
Brand:
Model:
Escalade
2020
2023
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
2024
2020
2023
Sierra Limited
2019
2019
Sierra 1500
(New Model)
2019
2021
2022
2022
Tahoe
Sierra 1500 Limited
(RPO J21, 12th
VIN Digit = 4
or less)
GMC
VIN:
to
Silverado 1500
LTD (RPO J21,
12th VIN Digit = 4
or less)
Chevrolet
Model Year:
from
Sierra 1500 New
(RPO J22, 12th
VIN Digit = 5 or
greater)
Sierra 1500
2023
Sierra
2500/HD/3500HD
2020
Yukon Models
2020
Copyright 2023 General Motors LLC. All Rights Reserved.
2024
2023
from
to
Engine:
Page 2
October, 2023
Bulletin No.: 23-NA-185
Involved Region or Country
North America, Middle East, Israel, Palestine, Chile, Paraguay, Uruguay, Peru, Japan,
Thailand, Australia, New Zealand, Uzbekistan, Russia, Columbia, Ecuador, GM Korea
Company, S. Korea, and Europe.
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)
Condition
Some customers may comment on one or more of the following conditions:
• Service 4WD on the DIC
• MIL illuminated
• 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.
NO, move onto 6
6. Perform a
thorough visual
inspection of the
area of the
vehicle related to
the customer
concern.
Diagnosing CCND Issues
Yes
Refer to SI for the
concern.
Yes
Replace any
damaged part.
NO, move onto 7
7. Could the issue
be intermittent?
Service Procedure
1. Can you
duplicate the
complaint?
Diagnosing CCND Issues
Yes
Refer to TSB 22NA-187.
NO, move onto 8
8. Verify that the
TCCM has the
latest calibration
through SPS2.
No
Follow instructions
on SPS2
programming tool.
NO, move onto 2
2. Is the problem
noise related?
Yes
Refer TSB 19NA-136.
NO, move onto 3
3. Is the issue
present only on
4HI or 4LO (if
equipped)?
Yes
Refer to FourWheel 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.
Additional information for steps above:
1. The issue reported by the customer might/might
not be duplicated by the technician during the visit.
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’s 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.
Bulletin No.: 23-NA-185
October, 2023
Page 3
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, DTC’s 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 the Published Labor
Operations Time
Version
1
Modified
Released October 24, 2023
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
- 🎉[OTOFIX D1 Lite, Perfect Cost-effective Diagnostic Tool]: OTOFIX D1 Lite, a newest bidirectional scan tool from OTOFIX company, is a great choice for DIYers and repair shops. 👉This obd2 scanner diagnostic tool packs all practical functions: OE level all systems diagnoses, Bi-Directional Control, 38+ reset services fixing 99% of common problems, support DoIP & CANDF protocols and FCA
AutoAuth, high-end hardware configuration. Worldwide vehicles and 🔥2 Years Free Updating🔥 covered. - 🎉[Bi-Directional Scan Tool, Active Test]: OTOFIX D1 Lite bluetooth obd2 scanner can also command ECUs and monitor the operation of the actuators to track down the problems of certain parts, like windows, sunroof, wipers, fuel pumps, etc., saving repair time & trouble. This makes OTOFIX D1 Lite the most cost-effective bidirectional scan tool.
- 🎉[2026 Newest, 38+ Hot Reset Functions]: Equipped with 38+ reset functions in one, the OTOFIX D1 lite automotive scanner diagnostic tool allows you to troubleshoot 99% of common vehicle problems. You can use this car diagnostic scanner holding enough functions to easily repair common vehicle models in your repair shops. Including Oil Reset, Injector Coding, Throttle, DPF Reset, SCR Reset, Gear Learning, Clutch Learning, Suspension, etc. Note* Reset functions vary by model.
- 🎉[OE Level Full Systems Diagnostics]: Unlike the 2-system and 4-system diagnostic tools, the OTOFIX auto scan tool can complete comprehensive system diagnostics within 5 minutes. It accesses and scans all available onboard systems like for Engine /AT /ABS /EPB /BMS /TPMS /SRS /SAS /Audio System /BCM /Air Conditioning / etc., to read & clear codes, view live data, and check ECU information. Note: Active test is not involved.
- 🎉[Powerful Hardware Configuration]: Designed with a fashion appearance & a 7” touchscreen and a weight of 463g, this OTOFIX D1 Lite OBD2 diagnostic scanner scan tool is convenient for everywhere and easy to use & store. Android9.0 OS and 2+64GB memory enhance multi-task smoothness and diagnostic operation, no more wasting too much time. 5800mAh battery allows hours-lasting use. WiFi & VCI1 also bring faster communication for your diagnostics.
- 🏆【2026 TOP OBD2 Scanner Diagnostic Tool】OTOFIX D1 Lite wireless obd2 scanner has upgraded hardware configuration and car coverage. The newly upgraded D1 Lite with 🔥OS Android 9.0🔥1.5Ghz 4 core high efficiency processor🔥2GB RAM+64GB ROM large storage🔥5800mAh large battery, more stable and longer lasting diagnostics🔥 38+ Reset🔥action tests🔥full system diagnostic🔥Supports MV105 endoscope🔥21+ Language Supports🔥100000+ vehicle coverage to meet all your daily maintenance needs.
- 👍【Bi-Directional Control / Active Test】D1 Lite obd2 scanner has bidirectional control(worth $300+), which is the most beloved feature among mechanic. If your headlights or car windows are broken, going to a repair shop will cost a lot of money. You can use D1 Lite to send execution commands to the ECU module and identify the repair status. Such as ABS, car windows, doors, valves, wipers, headlights, etc., effectively shorten diagnostic time and reduce diagnostic costs.
- 🔥【All Systems Diagnostics, In-depth Checking】This advanced OBD2 Scanner D1 Lite can perform OE-level diagnosis of all systems including engine, transmission, airbag, ABS, ESP, TPMS, gateway, steering, radio, and air conditioning for more than 100 brands. This diagnostic scanner supports essential functions, such as reading ECU version info, reading and clearing fault codes, and reading data streams.With just a simple click, it provides you with accurate and in-depth diagnostics.
- 🏆【38+ Reset Hot Functions】For repair workshops, holding an OTOFIX D1 Lite Auto scanner is a strong advantage over others. Its 38+ maintenance functions provide various solutions for all module repairs, including Oil Reset, TPMS Reset, Injector Coding, Suspension, Throttle Matching, etc., which will usher your repair business to a new pinnacle. Continuously updating will never make the functionality & compatibility out-of-date.
- 🏆【150+ Models, 10000+ Car Coverage & 16 Languages】D1 Lite is a comprehensive car diagnostic scan tool, help you to troubleshoot car issues fast for 95% US, European, Asian auto makes. ✅ With frequent updates and optimizations allow D1 Lite to cover more vehicles to meet your needs. ✅ Multilingual menu allows auto mechanics around the world to use it without language barriers. 🚩Note: Kindly send us the S/N of the device to authorize new language updates before changing the menu language.
- 【2026 OTOFIX D1 Lite Gives the Best Value for Money】OTOFIX D1 Lite bidirectional scan tool is more FASTER and SMARTER with 2026 Enhanced Hardwares & New Functions! 👍Alternative Bluetooth +USB connect 👍2G+64GB 👍4x ARM Cortex-A35 (1.5GHz) Processor (5X Faster CPU) 👍Android 9.0 OS 👍5G GHz WiFi 👍CANFD&DOIP 👍 FCA AutoAuth 👍38+ Services 👍3K+ Bi-Directional Control 👍Full Systems Diagnose 👍2 Years Update 👍150+ Vehicle Coverage.
- 👍【Active Tests】 OTOFIX D1 Lite is a bi-directional scan tool that can send commands to, and also receive information from vehicle control modules. This way, you can quickly locate and repair faulty auto parts. For Example: send direct commands to ask the vehicle to turn on/off the radiator fan, lights, sound horn, fuel pump, modulate throttle, open/close windows, operate mirrors and more. *Note that only available tests will be displayed in the menu.
- 👍【38+ Service Functions】 OTOFIX D1 Lite scan tool offers 38+ of the hottest service functions that are commonly used for car repairs. That include Oil reset/SAS/EPB/BMS/Throttle/ABS bleeding, and 2065-new SUS/ADBLUE/NOX/Headlamp resets (and more) to help restore your car status after repairs are done. Compared to other diagnostic scanners for cars, the OTOFIX D1 Lite scanner is much more fully-featured. *Note that specific functions available depend on the make/model/year of your car.
- 👍【All System Diagnostics + Cloud Report Management】 This 2026 car scanner OTOFIX D1 Lite provides troubleshooting and data for all ECUs: read/clear DTCs, view graphic live data/VIN, and locate system faults for safe driving. With Cloud Report Management, you can save detailed reports to cloud servers and easily shared them with others via QR codes/emails/text messages. Others can access these reports from any device (smartphones/tablets/PCs …) anytime, and you can better manage repair work.
- 👍【99% Car Coverage】 This one-station car scanner diagnostic for all cars works on 150+ major car brands across the world. 1) It supports CAN-FD/DoIP protocols: compatible with GMCAVALIER/TRAX/Encore/Envision/GL8(LSY)/CT4/CT5 after 2019; Volvo after 2018; Land Rover/Jaguar after 2017; and BM.W F/G all chassis. 2) For models equipped with security modules (such as Renault & 2018+ FCA SGW), its built-in AutoAuth allows you to easily break diagnostic barriers after registration.
This product presentation was made with AAWP plugin.
Last update on 2026-05-12 / Affiliate links / Images from Amazon Product Advertising API