NHTSA ID Number: 10199270
Manufacturer Communication Number: 21NA108
TSB/Document Date: 2021-07-19
Summary
This service bulletin provides diagnostic information for the technician regarding a customer concern of engine overheating, cooling system contaminated with engine oil.
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TSB/Document ID: 21NA108
Replacement Service Bulletin Number:
MFR Communication Date: 2021-05-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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Service Bulletin
Bulletin No.:
21-NA-108
Date:
May, 2021
INFORMATION
Subject:
Information on Engine Overheating, Cooling System Contaminated with Engine Oil
This bulletin replaces PIP5257E. Please discard PIP5257E.
Model Year:
Brand:
Model:
from
Allure
Buick
Enclave
to
from
to
2010
Engine:
(3.0L
or 3.6L)
2021
LFY, LLT
2019
LF1, LFW,
LFX, LGX
ATS
2013
2019
LF4,
LFX, LGX
CT5
2020
2021
LGY
CT6
2016
2021
LGW, LGX
CTS
2010
2019
LFW, LF3,
LFX, LGX
SRX
2010
2016
LFX, LFW
XT5
2017
2021
LGX
XT6
2020
2021
LGX
—
—
XTS
2013
2019
Blazer
2019
2021
LGX
Camaro
2010
2021
LFX, LGX
Caprice
2012
2017
LFX
Captiva
2011
2018
LFW, LFX
Colorado
2015
2021
LFX, LGZ
Equinox
2010
2017
LF1,
LFW, LFX
LF3, LFX
Impala
2012
2020
LFX
Traverse
2010
2021
LFY, LLT
Acadia
2010
2021
LGX, LLT
Canyon
2015
2021
LFX, LGZ
Terrain
2010
2016
LF1,
LFW, LFX
Copyright 2021 General Motors LLC. All Rights Reserved.
LF1, LFW,
LFX, LLT
2016
LaCrosse
VIN:
—
Page 2
May, 2021
Bulletin No.: 21-NA-108
Involved Region or Country
North America, Europe, Russia, Middle East, Iraq, Brazil, Chile, Colombia, Ecuador,
Paraguay, Uruguay, Venezuela, Japan, GM Korea Company, Cadillac Korea (South
Korea), China, Taiwan, Singapore, Australia/New Zealand, Other Africa
Condition
Some customers may comment that the engine is overheating.
Some customers may also comment on one or more of the following conditions:
• Oil in the coolant overflow reservoir
• Coolant discharging from the coolant reservoir
Cause
This condition may be caused by a leakage from the main oil gallery to a water jacket
through block porosity or thin wall casting.
– A very thick oil in coolant mix in the radiator and coolant overflow reservoir may be
found.
– The average oil pressure is over 414 kPa (60 psi) and the coolant pressure is 110 kPa
(16 psi).
Correction
If a vehicle with this concern has been verified:
• if equipped, test the oil cooler system for possible leaking into the coolant through the
radiator. If the oil cooler tests good, or the vehicle is not equipped with an oil cooler,
then reference this bulletin and replace the engine as well as all rubber coolant hoses.
• If possible, flush the radiator and heater core. Only replace those as needed.
• if equipped, flush the rear heater core and replace hoses. Only replace those as
needed.
Service Procedure
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 Engine Replace in SI.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
4067490
Description
Labor Time
Engine Replacement
Use
Published
Labor
Operation
Time
Version
1
Modified
Released May 04, 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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