GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5460
URGENT - DISTRIBUTE IMMEDIATELY
Date:

July 29, 2020

Subject: N202310520 - Service Update
Engine Oil Cooler Lines
Models: 2021 Chevrolet Tahoe, Suburban
2021 GMC Yukon, Yukon XL
To:

All General Motors Dealers

General Motors is releasing Service Update N202310520 today. The total
number of U.S. vehicles involved is approximately 5,757. Please see the
attached bulletin for details.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen will
be updated July 30, 2020 or sooner. A list of involved vehicles in dealer new inventory
is attached to this message. Please hold all warranty transactions until IVH has been
updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Service Update
N202310520 Engine Oil Cooler Lines
Release Date:
Attention:

July 2020

Revision:

00

This service update involves vehicles in dealer inventory only and will expire July 31, 2021.

Make
Chevrolet
GMC

Model
Tahoe, Suburban
Yukon, Yukon XL

Model Year
From
To
2021

RPO

Description

2021

This service update should be performed on vehicles in dealer inventory only. Involved vehicles are marked “open” on
the Investigate Vehicle History screen in GM Global Warranty Management system. This site should always be checked
to confirm vehicle involvement prior to beginning any required inspections and/or repairs.
Condition
Correction

Certain 2021 model year Chevrolet Tahoe, Suburban, GMC Yukon and Yukon XL vehicles may have a
condition where the engine oil cooler line is not fully seated into the quick connect at the radiator.
Dealers are to inspect the engine oil cooler lines at the quick connector on the radiator to confirm they
are fully seated.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9105228

Description
Inspect and Ensure Oil Cooler Line Quick Connects are Securely
Fastened

Labor
Time
0.6

Trans.
Type
ZFAT

Net
Item
N/A

Service Procedure
Note: Most vehicles involved in this recall should not have plastic covers over the engine oil cooler quick connect fittings.
If a vehicle does, just slide them off to inspect (if necessary, to visually double check the line is seated) and back on again
when the inspection is finished.
1.

Open the hood.

5636481
2.

Locate the upper oil cooler line where it goes into the radiator as shown.

Copyright 2020 General Motors. All Rights Reserved.

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Service Update
N202310520 Engine Oil Cooler Lines
3.

Firmly push the engine oil cooler line into the radiator to be sure it is seated, then gently tug on the line to check that
it cannot come loose.

4.

Lift the vehicle. Refer to Lifting and Jacking the Vehicle in SI.

5.

Remove the passenger’s side wheelhouse liner. Refer to Front Wheelhouse Liner Replacement in SI.

5636485

6.

Locate the lower oil cooler line where it goes into the radiator as shown.

7.

Firmly push the lower engine oil cooler line into the radiator to be sure it is seated, then gently tug on the line to
check that it cannot come loose.
Caution: The purpose of this field action is to ensure the engine oil cooler lines are seated in the quick
connect fitting. Catastrophic engine failure can occur if they are not. Be completely sure both engine oil
cooler lines are seated fully in the radiator before proceeding.

8.

Reinstall the passenger’s side wheelhouse liner. Refer to Front Wheelhouse Liner Replacement in SI.

9.

Lower the vehicle.

10. Close the hood.
Dealer Responsibility
Dealers must take the steps necessary to ensure that the service update correction has been made to all involved vehicles
in dealer inventory before selling or dealer-trading the vehicle, but no later than July 31, 2021.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers
take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded,
released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.
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 tools, equipment, 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 dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

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