21-NA-271

Bulletin No.:
Service Bulletin
Date:
21-NA-271
August, 2023
INFORMATION
Subject:
Information on Malfunction Indicator Lamp (MIL) Illuminated - DTC P026A Set
This bulletin replaces PIP5745A. Please discard PIP5745A.
Brand:
Model:
Cadillac
to
Escalade models
2021
2024
Silverado 1500
2020
2021
2022
2022
Silverado 1500 LTD
(RPO J21, VIN Digit
5 = W / Y)
Chevrolet
Silverado 1500 New
(RPO J22, VIN Digit
5 = A / D)
Silverado 1500
2023
Suburban
2021
Tahoe
2021
Sierra 1500
2020
2021
2022
2022
Sierra 1500 Limited
(RPO J21, VIN Digit
5 = 8 / 9)
GMC
Model Year:
from
Sierra 1500 New
(RPO J22, VIN Digit
5 = H / U)
Sierra 1500
2023
Yukon models
2021
Copyright 2023 General Motors LLC. All Rights Reserved.
2024
2024
VIN:
from
Engine:
to
Equipped with
3.0L (RPO LM2)
Transmission:
Page 2
August, 2023
Important: This technical service bulletin (TSB) can
only be completed by certified repair facilities who have
met all specific training, tool and equipment
requirements pertaining to the vehicle Brand and Model
serviced. Repairs must be performed by a technician
who has successfully completed the required training.
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
Bulletin No.: 21-NA-271
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.
Involved Region or Country
North America, Uzbekistan, Russia, Middle East, Chile, Columbia, Ecuador, Paraguay,
Peru, Uruguay, Japan, S. Korea, Thailand, Australia, New Zealand, Europe.
Condition
Some customers may comment that the MIL is illuminated.
Some technicians may find DTC P026A set in the Engine Control Module (ECM).
Cause
This may be due to a kinked hose at or near the low temperature auxiliary coolant pump.
Correction
If this condition is encountered, loosen the hose clamp and rotate the hose to allow for
proper coolant flow.
5635568
5635679
Bulletin No.: 21-NA-271
August, 2023
Page 3
Version
3
Modified
Released November 19, 2021
Revised November 09, 2022 - Added 2023 Model Year and Important statements
Revised August 01, 2023 — Added the 2024 Model Year and Europe to the involved
regions.
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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