21NA271

Bulletin No.:
Service Bulletin
Date:
21-NA-271
November, 2021
INFORMATION
Subject:
Information on Malfunction Indicator Lamp (MIL) Illuminated - DTC P026A Set
This bulletin replaces PIP5745A. Please discard PIP5745A.
Model Year:
VIN:
Engine:
Brand:
Model:
Cadillac
Escalade models
2021
LM2
Silverado 1500
2020
LM2
Suburban
2021
Tahoe
2021
Sierra 1500
2020
LM2
Yukon models
2021
LM2
Chevrolet
GMC
from
to
2022
from
Transmission:
to
LM2
LM2
Involved Region or Country
North America, Uzbekistan, Russia, Middle East, Chile, Columbia, Ecuador, Paraguay,
Peru, Uruguay, Japan, S. Korea, Thailand, Australia, New Zealand.
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.
Copyright 2021 General Motors LLC. All Rights Reserved.
Page 2
November, 2021
Bulletin No.: 21-NA-271
5635568
Correction
If this condition is encountered, loosen the hose clamp and rotate the hose to allow for
proper coolant flow.
5635679
Version
1
Modified
Released November 19, 2021
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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