NHTSA ID Number: 11010639
Manufacturer Communication Number: 24-NA-196
TSB/Document Date: 2024-11-19
Summary
This informational bulletin advises the tech and the customer of a normal DEF operation while under high load conditions and when the time is right to fill the DEF at that time frame.
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TSB/Document ID: 24-NA-196
Replacement Service Bulletin Number:
MFR Communication Date: 2024-10-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Bulletin No.: 24-NA-196
Service Bulletin
Date: October, 2024
INFORMATION
Subject:
Brand:
Information on Complaint of Empty DEF Tank Shortly After Beginning a Towing
Trip and/or Unable to Properly Fill the DEF Tank
Model:
Model Year:
from
Build Date:
to
from
Escalade Models
2021
2025
Silverado 1500
2020
2021
2022
2022
Silverado 1500 LTD
(RPO J21, VIN Digit
5 = W / Y)
Silverado 1500 New
(RPO J22, VIN Digit
5 = A / D)
Silverado 1500
2023
Silverado 2500HD/
3500HD
2020
Suburban
Tahoe
Sierra 1500
Sierra 1500 Limited
(RPO J21, VIN Digit
5 = 8 / 9)
Sierra 1500 New
(RPO J22, VIN Digit
5 = H / U)
LM2, LZ0, L5P
2020
2021
2022
2022
2023
Sierra 2500HD/
3500HD
2020
Yukon Models
2020
to
Transmissi
on:
2025
2020
Sierra 1500
Engine:
2025
Involved Region or Country
North America
Condition
Some customers may comment on an empty DEF tank shortly after beginning a towing
trip and/or unable to properly fill the DEF tank.
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.
Copyright 2024 General Motors. All Rights Reserved.
Page 2
October, 2024
Bulletin No.: 24-NA-196
Information
Important: Refer to 22-NA-150 to verify in the Reductant Control Module is at the latest update available and the
Reductant Fluid Tank Level has been reset.
Note: This condition can be exacerbated by vehicle loading that exceeds the Gross Combined Weight Rating
(GCWR) when towing. This information can be found on the towing placard inside the driver’s door. The dealer
should have the owner confirm by using a commercial scale that the total weight of the vehicle, trailer, and cargo do
not exceed the GCWR stated on the placard.
Under high load towing conditions, the amount of DEF used may engage the warning strategy before the DEF tank
can read a fill. If a customer attempts to fill at this time, the vehicle DEF system will not see the fill and may not see
subsequent fill attempts. Allow the vehicle to progress into the warning strategy until a specific speed limitation
warning is displayed before adding DEF to the tank. In the US, this will be a 65mph limitation.
• When the warning strategy is implemented, it is based on an estimated range to speed limitation of 1000 miles.
When the gauge is reviewed during the warning strategy, the gauge will show very little DEF or no DEF at all.
This is normal – the DEF needed to complete the warning and inducement is not shown on the gauge. Only the
reserve is displayed in some cases, with large trailers, there may be no reserve and no gauge bars displayed.
6749360
Bulletin No.: 24-NA-196
October, 2024
Page 3
• This combination of a DEF system message and a low gauge reading may drive customers to add DEF immediately to try to drive the gauge back up or to make the message stop. The chart shows the dash messages while
towing and areas and messages in RED where it is not appropriate to add DEF to the tank.
• Areas in green indicate that at these warning levels and when these messages are displayed it is OK to add
DEF to the tank.
• Customers need to be encouraged to ignore the gauge under these conditions until the warning strategy
indicates a specific speed limitation will be reached (65mph/105kph). When the system goes from “speed
limited soon” to “speed limited to 65mph in xx miles” it is safe to add DEF and the fill will be detected. The
messages may stop for a short period, but they will begin again shortly if the vehicle is still towing. The owner
can continue to operate the vehicle until they are being told that inducement and speed reduction are imminent.
This is technically the best time to fill the DEF tank, and the system will always register a fill from inducement
level if no DEF has been added during the warning strategy and if there are no functional issues with the DEF
system.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation
Description
Labor Time
4089338*
Confirm DEF System Proper Operation
0.5 hr
*This is a unique Labor Operation for Bulletin use only.
Version
2
Modified
Released September 23, 2024
Revised October 09, 2024 - Removed 2017 to 2019 Model Year, Added 2020 to
Applicable Models, and Updated Information Section Information.
Additional Keywords: DEF, Range, Message, Towing, Gauge
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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