NHTSA ID Number: 11007718
Manufacturer Communication Number: 19-NA-237
TSB/Document Date: 2024-09-11
Summary
This service bulletin explains how to identify possible DEF system contamination.
Bulletin No.: 19-NA-237
Service Bulletin
Date: August, 2024
INFORMATION
Subject:
Diagnostic Tip - Diesel Exhaust Fluid System Contamination
This bulletin replaces PIP5370D. Please discard PIP5370D.
Brand:
Model:
Escalade Models
2021
2024
LM2
XT4
2020
2023
LSQ
2014
2015
LUZ
2017
2019
LH7
Colorado
2016
2022
LWN
Equinox
2018
2019
LH7
2010
2016
LGH
2017
2022
LWN
2011
2016
LML
2017
2018
L5P
2020
2021
2022
2022
Silverado 1500
2023
2025
Silverado 2500/3500
2019
2025
L5P
Silverado 4500HD,
5500HD and 6500HD
2019
2025
L5D
2021
2025
LM2, LZ0
2010
2016
LGH
2017
2022
LWN
Silverado
Silverado 1500
Silverado 1500 LTD
(RPO J21, VIN Digit 5
= W / Y)
Silverado 1500 New
(RPO J22, VIN Digit 5
= A / D)
Suburban
Tahoe
Savana
Sierra
Sierra 1500
Sierra 1500 Limited
(RPO J21, VIN Digit 5
= 8 / 9)
Sierra 1500 New
(RPO J22, VIN Digit 5
= H / U)
Sierra 1500
Copyright 2024 General Motors
. All Rights Reserved.
from
Engine:
to
Express
VIN:
from
Cruze
Model Year:
to
LM2
—
—
LZ0
2011
2016
LML, LGH
2017
2018
L5P
2020
2021
2022
2022
2023
2025
LM2
LZ0
—
Page 2
Brand:
August, 2024
Model:
VIN:
from
Engine:
from
to
Sierra 2500/3500
2019
2025
L5P
Yukon Models
2021
2025
LM2, LZ0
Involved Region or Country
Condition
Model Year:
Bulletin No.: 19-NA-237
Transmission:
to
United States, Canada, Europe, Middle East, Israel, Palestine, Thailand, Australia/New
Zealand
Some customers may comment on one or more of the following conditions:
• Exhaust fluid quality poor message on the Driver Information Center (DIC).
• Diesel exhaust fluid warning lamp on.
• Other exhaust fluid quality related concerns.
Cause
This condition may be caused by contamination in the diesel exhaust fluid (DEF) system
and it's components.
Correction
Note: Please follow this diagnostic or repair process thoroughly and complete each step.
If the condition exhibited is resolved without completing every step, the remaining steps
do not need to be performed.
Refer to SI for Contaminants in Diesel Exhaust Fluid Diagnosis and use special
tools J26568 Coolant and Battery Fluid Tester or EN50422 Diesel Exhaust Fluid Refractometer for fluid testing.
Note: All 2017 and newer model year diesel vehicles, with the exception of the Colorado
and Canyon, are equipped with a DEF quality sensor integrated into the DEF tank. The
value of this sensor can be read with the scan tool in the reductant data as the Reductant
Concentration.
Information
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.
Below are examples of DEF mixed with different
sources of contamination.
4373640
Diesel Exhaust Fluid (DEF) mixed with Brake Fluid.
Bulletin No.: 19-NA-237
August, 2024
Page 3
4373644
4373641
Diesel Exhaust Fluid (DEF) mixed with Dexcool.
Diesel Exhaust Fluid (DEF) mixed with Engine Oil.
4373642
Diesel Exhaust Fluid (DEF) mixed with Diesel Fuel.
4373645
Diesel Exhaust Fluid (DEF) mixed with Power Steering
Fluid.
Page 4
August, 2024
Bulletin No.: 19-NA-237
Diesel Exhaust Fluid (DEF) mixed with Windshield
Washer Fluid.
4373646
Diesel Exhaust Fluid (DEF) mixed with Transmission
Fluid.
4373648
Diesel Exhaust Fluid (DEF) mixed with Water.
Warranty Information
This bulletin is being published to help technicians
identify signs of contamination in Diesel Exhaust Fluid
(DEF). If you see evidence of contamination, take
appropriate measures to ensure that all of the contaminated fluid is removed from the vehicle. Any components that have failed as a result of contamination
should NOT be covered by warranty.
4373647
Version
7
Modified
Released October 17, 2019
Revised October 27, 2020 – Added 2021 Model Year.
Revised January 10, 2022 – Added 2022 Model Year.
Revised September 12, 2022 – Added 2023 Model Year and Important statement under
Information.
Revised March 16, 2023 – Added the 2024 Model Year for the Silverado/Sierra
2500/3500 trucks, XT4 with LSQ model and updated the Involved Region or Country section.
Revised April 05, 2023 – Removed GM Korea Company from Involved Region or Country
section.
Revised August 09, 2024 - Added 2025 to Model Year and 2024 Escalade.
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-237
Replacement Service Bulletin Number:
MFR Communication Date: 2024-08-12
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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