NHTSA ID Number: 11001328
Manufacturer Communication Number: 19-NA-136
TSB/Document Date: 2024-06-08
Summary
This service bulletin provides a diagnostic procedure to aid in correcting a customer concern of a Howling, Whining/Whirring Noise, Shudder/Vibration and/or Grinding Noise While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode.
Bulletin No.: 19-NA-136
Service Bulletin
Date: May, 2024
TECHNICAL
Subject:
Brand:
Howling, Whining/Whirring, Shudder/Vibration and/or Grinding Noise
While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode
Model:
from
to
Escalade
2015
2025
Colorado
2015
2025
Silverado
2014
2018
Silverado 1500 (New
Model – 12th VIN
Digit = 7) - 4WD
2019
2019
Silverado 1500 (New
Model)
2019
2019
Silverado 1500
2020
2021
2022
2022
Silverado 1500
2023
2025
Silverado 2500HD/
3500HD
2019
2025
Silverado LD
2019
2019
Suburban
2015
2025
Tahoe
2015
2025
Canyon
2015
2025
Silverado 1500 - LTD
(RPO J21, VIN Digit 5
= W/Y)
Silverado 1500 - New
(RPO J22, VIN Digit 5
= A/D)
Model Year:
Sierra
2014
2018
Sierra 1500 (New
Model)
2019
2019
Sierra 1500
2020
2021
2022
2022
Sierra 1500
2023
2025
Sierra 2500HD/
3500HD
2019
2025
Sierra Limited
2019
2019
Yukon
2015
2025
Sierra 1500 - Limited
(RPO J21, VIN Digit 5
= 8/9)
Sierra 1500 - New
(RPO J22, VIN Digit 5
= H/U)
Copyright 2024 General Motors
. All Rights Reserved.
VIN:
from
to
MYC, M5U, MF6,
MQC, MHS, MY8,
M5T, N8R, MFC,
MQB, NQE, MHT,
MI2, MYB, MW7,
MGM, MGU, MKM
Page 2
May, 2024
Bulletin No.: 19-NA-136
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 Options (RPOs)
NP0, NQ6, NQ7, NQF, NQG, NQH
Some customers may comment on one or more of the following conditions during parking
lot maneuvers in AUTO Mode or highway speeds in 4HI or Auto:
• Howling noise
• Whining/Whirring noise
Condition
• Shudder/Vibration
• Grinding noise
Some customers also may state that a noise can be heard in 4Hi but goes away when
switched to 2HI.
Some technicians may find the concern coming from the transfer case.
Bulletin No.: 19-NA-136
Cause
May, 2024
Page 3
This condition may be caused by normal transfer case break-in and wear period, creating
excess contaminants in the fluid.
⇒ This may result in a customer complaint of excessive noise present with 4WD engaged and goes away when switched back to 2WD.
Perform road test to diagnose transfer case noise:
1. Place vehicle into AUTO mode, and perform low speed parking lot maneuvers, listening for the noise description noted above.
2. Place vehicle in 4HI. From a stop under moderate acceleration, listen for any growling,
howling, whining, or whirring noise.
Correction
4823455
Note: This video audio was recorded by using a picoscope microphone and was provided as an example for what to listen for. The growling/howling/whirring noise can be
heard in the vehicle cabin during moderate acceleration in 4HI from a stop, or during
steady speed switching between 2HI and 4HI as shown in the video.
3. As shown in the video above, at approximately highway speeds (55 mph or 89 km/h)
toggle between 4HI and 2Hi and listen for the same noise description noted (Growling,
etc.).
Once the transfer case noise is confirmed, refer to Transfer Case Fluid Replacement in
SI.
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.
Page 4
May, 2024
Bulletin No.: 19-NA-136
Parts Information
Causal
Part
Description
Part Number
Warranty Information
Qty
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History
(IVH) for coverage information.
88865601 (in
Canada
19421425)
19421180 - 1
LT (in Australia and
New Zealand)
N/A
Fluid
Refer to
19421181- 4 Fluid CapaciLT (in Austies in SI
tralia and
New Zealand)
19375058 20 LT (in
Australia and
New Zealand)
Labor Operation
Description
Labor Time
3080368*
Diagnostic Test and Test Drive
0.5 hr
Add
Fluid Drain and Fill
0.3 hr
*This is a unique Labor Operation for Bulletin use only.
Version
6
Modified
Released June 19, 2019
Revised November 30, 2020 - Added Addition Vehicles to the Model section and Additional Transfercase RPOs to the Additional Options (RPOs) section.
Revised February 19, 2021 - Added Model Year 2020 and 2021 to Escalade, Tahoe, Suburban, and Yukon Models. Revised Cause statement.
Revised November 18, 2022 - Added 2022 and 2023 to Model Year.
Revised December 21, 2022 - Added Australia and New Zealand Fluid Part Numbers to
Parts Information section.
Revised May 15, 2024 - Added 2024 and 2025 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: 19-NA-136
Replacement Service Bulletin Number:
MFR Communication Date: 2024-05-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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